{"api_version":"1","generated_at":"2026-08-22T17:47:29+00:00","cve":"CVE-2022-49142","urls":{"html":"https://cve.report/CVE-2022-49142","api":"https://cve.report/api/cve/CVE-2022-49142.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2022-49142","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2022-49142"},"summary":{"title":"net: preserve skb_end_offset() in skb_unclone_keeptruesize()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: preserve skb_end_offset() in skb_unclone_keeptruesize()\n\nsyzbot found another way to trigger the infamous WARN_ON_ONCE(delta < len)\nin skb_try_coalesce() [1]\n\nI was able to root cause the issue to kfence.\n\nWhen kfence is in action, the following assertion is no longer true:\n\nint size = xxxx;\nvoid *ptr1 = kmalloc(size, gfp);\nvoid *ptr2 = kmalloc(size, gfp);\n\nif (ptr1 && ptr2)\n\tASSERT(ksize(ptr1) == ksize(ptr2));\n\nWe attempted to fix these issues in the blamed commits, but forgot\nthat TCP was possibly shifting data after skb_unclone_keeptruesize()\nhas been used, notably from tcp_retrans_try_collapse().\n\nSo we not only need to keep same skb->truesize value,\nwe also need to make sure TCP wont fill new tailroom\nthat pskb_expand_head() was able to get from a\naddr = kmalloc(...) followed by ksize(addr)\n\nSplit skb_unclone_keeptruesize() into two parts:\n\n1) Inline skb_unclone_keeptruesize() for the common case,\n   when skb is not cloned.\n\n2) Out of line __skb_unclone_keeptruesize() for the 'slow path'.\n\nWARNING: CPU: 1 PID: 6490 at net/core/skbuff.c:5295 skb_try_coalesce+0x1235/0x1560 net/core/skbuff.c:5295\nModules linked in:\nCPU: 1 PID: 6490 Comm: syz-executor161 Not tainted 5.17.0-rc4-syzkaller-00229-g4f12b742eb2b #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nRIP: 0010:skb_try_coalesce+0x1235/0x1560 net/core/skbuff.c:5295\nCode: bf 01 00 00 00 0f b7 c0 89 c6 89 44 24 20 e8 62 24 4e fa 8b 44 24 20 83 e8 01 0f 85 e5 f0 ff ff e9 87 f4 ff ff e8 cb 20 4e fa <0f> 0b e9 06 f9 ff ff e8 af b2 95 fa e9 69 f0 ff ff e8 95 b2 95 fa\nRSP: 0018:ffffc900063af268 EFLAGS: 00010293\nRAX: 0000000000000000 RBX: 00000000ffffffd5 RCX: 0000000000000000\nRDX: ffff88806fc05700 RSI: ffffffff872abd55 RDI: 0000000000000003\nRBP: ffff88806e675500 R08: 00000000ffffffd5 R09: 0000000000000000\nR10: ffffffff872ab659 R11: 0000000000000000 R12: ffff88806dd554e8\nR13: ffff88806dd9bac0 R14: ffff88806dd9a2c0 R15: 0000000000000155\nFS:  00007f18014f9700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000020002000 CR3: 000000006be7a000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n <TASK>\n tcp_try_coalesce net/ipv4/tcp_input.c:4651 [inline]\n tcp_try_coalesce+0x393/0x920 net/ipv4/tcp_input.c:4630\n tcp_queue_rcv+0x8a/0x6e0 net/ipv4/tcp_input.c:4914\n tcp_data_queue+0x11fd/0x4bb0 net/ipv4/tcp_input.c:5025\n tcp_rcv_established+0x81e/0x1ff0 net/ipv4/tcp_input.c:5947\n tcp_v4_do_rcv+0x65e/0x980 net/ipv4/tcp_ipv4.c:1719\n sk_backlog_rcv include/net/sock.h:1037 [inline]\n __release_sock+0x134/0x3b0 net/core/sock.c:2779\n release_sock+0x54/0x1b0 net/core/sock.c:3311\n sk_wait_data+0x177/0x450 net/core/sock.c:2821\n tcp_recvmsg_locked+0xe28/0x1fd0 net/ipv4/tcp.c:2457\n tcp_recvmsg+0x137/0x610 net/ipv4/tcp.c:2572\n inet_recvmsg+0x11b/0x5e0 net/ipv4/af_inet.c:850\n sock_recvmsg_nosec net/socket.c:948 [inline]\n sock_recvmsg net/socket.c:966 [inline]\n sock_recvmsg net/socket.c:962 [inline]\n ____sys_recvmsg+0x2c4/0x600 net/socket.c:2632\n ___sys_recvmsg+0x127/0x200 net/socket.c:2674\n __sys_recvmsg+0xe2/0x1a0 net/socket.c:2704\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x44/0xae","state":"PUBLISHED","assigner":"Linux","published_at":"2025-02-26 07:00:51","updated_at":"2026-08-04 10:17:36"},"problem_types":["NVD-CWE-noinfo"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"5.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/a9a6d30264327d8ff7f23da33e7a77ffb793fa3f","name":"https://git.kernel.org/stable/c/a9a6d30264327d8ff7f23da33e7a77ffb793fa3f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/23629b673b780d967b88a850b1518cf0f0ffc6aa","name":"https://git.kernel.org/stable/c/23629b673b780d967b88a850b1518cf0f0ffc6aa","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a903e516f5df44b46d526b403d93e7be1a425538","name":"https://git.kernel.org/stable/c/a903e516f5df44b46d526b403d93e7be1a425538","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2b88cba55883eaafbc9b7cbff0b2c7cdba71ed01","name":"https://git.kernel.org/stable/c/2b88cba55883eaafbc9b7cbff0b2c7cdba71ed01","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-49142","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49142","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 097b9146c0e26aabaa6ff3e5ea536a53f5254a79 23629b673b780d967b88a850b1518cf0f0ffc6aa git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 097b9146c0e26aabaa6ff3e5ea536a53f5254a79 a9a6d30264327d8ff7f23da33e7a77ffb793fa3f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 097b9146c0e26aabaa6ff3e5ea536a53f5254a79 a903e516f5df44b46d526b403d93e7be1a425538 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 097b9146c0e26aabaa6ff3e5ea536a53f5254a79 2b88cba55883eaafbc9b7cbff0b2c7cdba71ed01 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7118945cdf0d4b5a76eb4f5f330ac6f48d372025 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ec697f7f3f6a89d4dd1af113587d0330b5a033e8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7582edf28f5d1f0a4d2f7abdb7d9560d09fd41b5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5d55a6a46a7f70bc1d270c50200edd3096cb380c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e6af7cb64b7b37b8a371acdbe33a636496ffb5a4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 97ff09a7ed484fef2b1bbc103857444b7332fca8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bf5a58d143d7899d2c89e585be6e98ec81fe9683 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.4.260 4.5 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.9.260 4.10 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.14.224 4.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.19.179 4.20 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.4.103 5.5 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.10.21 5.11 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.11.4 5.12 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.12","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.12 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.33 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.16.19 5.16.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.17.2 5.17.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.18 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2022","cve_id":"49142","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["include/linux/skbuff.h","net/core/skbuff.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"23629b673b780d967b88a850b1518cf0f0ffc6aa","status":"affected","version":"097b9146c0e26aabaa6ff3e5ea536a53f5254a79","versionType":"git"},{"lessThan":"a9a6d30264327d8ff7f23da33e7a77ffb793fa3f","status":"affected","version":"097b9146c0e26aabaa6ff3e5ea536a53f5254a79","versionType":"git"},{"lessThan":"a903e516f5df44b46d526b403d93e7be1a425538","status":"affected","version":"097b9146c0e26aabaa6ff3e5ea536a53f5254a79","versionType":"git"},{"lessThan":"2b88cba55883eaafbc9b7cbff0b2c7cdba71ed01","status":"affected","version":"097b9146c0e26aabaa6ff3e5ea536a53f5254a79","versionType":"git"},{"status":"affected","version":"7118945cdf0d4b5a76eb4f5f330ac6f48d372025","versionType":"git"},{"status":"affected","version":"ec697f7f3f6a89d4dd1af113587d0330b5a033e8","versionType":"git"},{"status":"affected","version":"7582edf28f5d1f0a4d2f7abdb7d9560d09fd41b5","versionType":"git"},{"status":"affected","version":"5d55a6a46a7f70bc1d270c50200edd3096cb380c","versionType":"git"},{"status":"affected","version":"e6af7cb64b7b37b8a371acdbe33a636496ffb5a4","versionType":"git"},{"status":"affected","version":"97ff09a7ed484fef2b1bbc103857444b7332fca8","versionType":"git"},{"status":"affected","version":"bf5a58d143d7899d2c89e585be6e98ec81fe9683","versionType":"git"},{"lessThan":"4.5","status":"affected","version":"4.4.260","versionType":"semver"},{"lessThan":"4.10","status":"affected","version":"4.9.260","versionType":"semver"},{"lessThan":"4.15","status":"affected","version":"4.14.224","versionType":"semver"},{"lessThan":"4.20","status":"affected","version":"4.19.179","versionType":"semver"},{"lessThan":"5.5","status":"affected","version":"5.4.103","versionType":"semver"},{"lessThan":"5.11","status":"affected","version":"5.10.21","versionType":"semver"},{"lessThan":"5.12","status":"affected","version":"5.11.4","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["include/linux/skbuff.h","net/core/skbuff.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.12"},{"lessThan":"5.12","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.33","versionType":"semver"},{"lessThanOrEqual":"5.16.*","status":"unaffected","version":"5.16.19","versionType":"semver"},{"lessThanOrEqual":"5.17.*","status":"unaffected","version":"5.17.2","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"5.18","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.33","versionStartIncluding":"5.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.16.19","versionStartIncluding":"5.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.17.2","versionStartIncluding":"5.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.18","versionStartIncluding":"5.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4.260","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9.260","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14.224","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.179","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.103","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.21","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11.4","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: preserve skb_end_offset() in skb_unclone_keeptruesize()\n\nsyzbot found another way to trigger the infamous WARN_ON_ONCE(delta < len)\nin skb_try_coalesce() [1]\n\nI was able to root cause the issue to kfence.\n\nWhen kfence is in action, the following assertion is no longer true:\n\nint size = xxxx;\nvoid *ptr1 = kmalloc(size, gfp);\nvoid *ptr2 = kmalloc(size, gfp);\n\nif (ptr1 && ptr2)\n\tASSERT(ksize(ptr1) == ksize(ptr2));\n\nWe attempted to fix these issues in the blamed commits, but forgot\nthat TCP was possibly shifting data after skb_unclone_keeptruesize()\nhas been used, notably from tcp_retrans_try_collapse().\n\nSo we not only need to keep same skb->truesize value,\nwe also need to make sure TCP wont fill new tailroom\nthat pskb_expand_head() was able to get from a\naddr = kmalloc(...) followed by ksize(addr)\n\nSplit skb_unclone_keeptruesize() into two parts:\n\n1) Inline skb_unclone_keeptruesize() for the common case,\n   when skb is not cloned.\n\n2) Out of line __skb_unclone_keeptruesize() for the 'slow path'.\n\nWARNING: CPU: 1 PID: 6490 at net/core/skbuff.c:5295 skb_try_coalesce+0x1235/0x1560 net/core/skbuff.c:5295\nModules linked in:\nCPU: 1 PID: 6490 Comm: syz-executor161 Not tainted 5.17.0-rc4-syzkaller-00229-g4f12b742eb2b #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nRIP: 0010:skb_try_coalesce+0x1235/0x1560 net/core/skbuff.c:5295\nCode: bf 01 00 00 00 0f b7 c0 89 c6 89 44 24 20 e8 62 24 4e fa 8b 44 24 20 83 e8 01 0f 85 e5 f0 ff ff e9 87 f4 ff ff e8 cb 20 4e fa <0f> 0b e9 06 f9 ff ff e8 af b2 95 fa e9 69 f0 ff ff e8 95 b2 95 fa\nRSP: 0018:ffffc900063af268 EFLAGS: 00010293\nRAX: 0000000000000000 RBX: 00000000ffffffd5 RCX: 0000000000000000\nRDX: ffff88806fc05700 RSI: ffffffff872abd55 RDI: 0000000000000003\nRBP: ffff88806e675500 R08: 00000000ffffffd5 R09: 0000000000000000\nR10: ffffffff872ab659 R11: 0000000000000000 R12: ffff88806dd554e8\nR13: ffff88806dd9bac0 R14: ffff88806dd9a2c0 R15: 0000000000000155\nFS:  00007f18014f9700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000020002000 CR3: 000000006be7a000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n <TASK>\n tcp_try_coalesce net/ipv4/tcp_input.c:4651 [inline]\n tcp_try_coalesce+0x393/0x920 net/ipv4/tcp_input.c:4630\n tcp_queue_rcv+0x8a/0x6e0 net/ipv4/tcp_input.c:4914\n tcp_data_queue+0x11fd/0x4bb0 net/ipv4/tcp_input.c:5025\n tcp_rcv_established+0x81e/0x1ff0 net/ipv4/tcp_input.c:5947\n tcp_v4_do_rcv+0x65e/0x980 net/ipv4/tcp_ipv4.c:1719\n sk_backlog_rcv include/net/sock.h:1037 [inline]\n __release_sock+0x134/0x3b0 net/core/sock.c:2779\n release_sock+0x54/0x1b0 net/core/sock.c:3311\n sk_wait_data+0x177/0x450 net/core/sock.c:2821\n tcp_recvmsg_locked+0xe28/0x1fd0 net/ipv4/tcp.c:2457\n tcp_recvmsg+0x137/0x610 net/ipv4/tcp.c:2572\n inet_recvmsg+0x11b/0x5e0 net/ipv4/af_inet.c:850\n sock_recvmsg_nosec net/socket.c:948 [inline]\n sock_recvmsg net/socket.c:966 [inline]\n sock_recvmsg net/socket.c:962 [inline]\n ____sys_recvmsg+0x2c4/0x600 net/socket.c:2632\n ___sys_recvmsg+0x127/0x200 net/socket.c:2674\n __sys_recvmsg+0xe2/0x1a0 net/socket.c:2704\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x44/0xae"}],"metrics":[{"cvssV3_1":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-08-04T09:04:18.099Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/23629b673b780d967b88a850b1518cf0f0ffc6aa"},{"url":"https://git.kernel.org/stable/c/a9a6d30264327d8ff7f23da33e7a77ffb793fa3f"},{"url":"https://git.kernel.org/stable/c/a903e516f5df44b46d526b403d93e7be1a425538"},{"url":"https://git.kernel.org/stable/c/2b88cba55883eaafbc9b7cbff0b2c7cdba71ed01"}],"title":"net: preserve skb_end_offset() in skb_unclone_keeptruesize()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2022-49142","datePublished":"2025-02-26T01:55:12.823Z","dateReserved":"2025-02-26T01:49:39.269Z","dateUpdated":"2026-08-04T09:04:18.099Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-02-26 07:00:51","lastModifiedDate":"2026-08-04 10:17:36","problem_types":["NVD-CWE-noinfo"],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4.260","versionEndExcluding":"4.5","matchCriteriaId":"184459E2-CD85-4614-95F3-2DCE9075D049"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9.260","versionEndExcluding":"4.10","matchCriteriaId":"DC918819-19A0-4ACA-92EA-B8CA5FB74C47"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14.224","versionEndExcluding":"4.15","matchCriteriaId":"8944A7F6-3F7F-4FB3-B09D-13FF776763D4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.179","versionEndExcluding":"4.20","matchCriteriaId":"09FD26FA-3243-4BFB-888A-FAD8B04EE388"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.103","versionEndExcluding":"5.5","matchCriteriaId":"77F47A48-724C-4A8A-BE16-F2C832EECA05"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.21","versionEndExcluding":"5.11","matchCriteriaId":"FA8451E2-8B08-45A9-AEC4-3F6C9C651E35"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11.4","versionEndExcluding":"5.15.33","matchCriteriaId":"2B965B7B-E43F-4E19-9040-6F85F535AF61"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"5.16.19","matchCriteriaId":"20C43679-0439-405A-B97F-685BEE50613B"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"5.17.2","matchCriteriaId":"210C679C-CF84-44A3-8939-E629C87E54BF"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2022","CveId":"49142","Ordinal":"1","Title":"net: preserve skb_end_offset() in skb_unclone_keeptruesize()","CVE":"CVE-2022-49142","Year":"2022"},"notes":[{"CveYear":"2022","CveId":"49142","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: preserve skb_end_offset() in skb_unclone_keeptruesize()\n\nsyzbot found another way to trigger the infamous WARN_ON_ONCE(delta < len)\nin skb_try_coalesce() [1]\n\nI was able to root cause the issue to kfence.\n\nWhen kfence is in action, the following assertion is no longer true:\n\nint size = xxxx;\nvoid *ptr1 = kmalloc(size, gfp);\nvoid *ptr2 = kmalloc(size, gfp);\n\nif (ptr1 && ptr2)\n\tASSERT(ksize(ptr1) == ksize(ptr2));\n\nWe attempted to fix these issues in the blamed commits, but forgot\nthat TCP was possibly shifting data after skb_unclone_keeptruesize()\nhas been used, notably from tcp_retrans_try_collapse().\n\nSo we not only need to keep same skb->truesize value,\nwe also need to make sure TCP wont fill new tailroom\nthat pskb_expand_head() was able to get from a\naddr = kmalloc(...) followed by ksize(addr)\n\nSplit skb_unclone_keeptruesize() into two parts:\n\n1) Inline skb_unclone_keeptruesize() for the common case,\n   when skb is not cloned.\n\n2) Out of line __skb_unclone_keeptruesize() for the 'slow path'.\n\nWARNING: CPU: 1 PID: 6490 at net/core/skbuff.c:5295 skb_try_coalesce+0x1235/0x1560 net/core/skbuff.c:5295\nModules linked in:\nCPU: 1 PID: 6490 Comm: syz-executor161 Not tainted 5.17.0-rc4-syzkaller-00229-g4f12b742eb2b #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nRIP: 0010:skb_try_coalesce+0x1235/0x1560 net/core/skbuff.c:5295\nCode: bf 01 00 00 00 0f b7 c0 89 c6 89 44 24 20 e8 62 24 4e fa 8b 44 24 20 83 e8 01 0f 85 e5 f0 ff ff e9 87 f4 ff ff e8 cb 20 4e fa <0f> 0b e9 06 f9 ff ff e8 af b2 95 fa e9 69 f0 ff ff e8 95 b2 95 fa\nRSP: 0018:ffffc900063af268 EFLAGS: 00010293\nRAX: 0000000000000000 RBX: 00000000ffffffd5 RCX: 0000000000000000\nRDX: ffff88806fc05700 RSI: ffffffff872abd55 RDI: 0000000000000003\nRBP: ffff88806e675500 R08: 00000000ffffffd5 R09: 0000000000000000\nR10: ffffffff872ab659 R11: 0000000000000000 R12: ffff88806dd554e8\nR13: ffff88806dd9bac0 R14: ffff88806dd9a2c0 R15: 0000000000000155\nFS:  00007f18014f9700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000020002000 CR3: 000000006be7a000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n <TASK>\n tcp_try_coalesce net/ipv4/tcp_input.c:4651 [inline]\n tcp_try_coalesce+0x393/0x920 net/ipv4/tcp_input.c:4630\n tcp_queue_rcv+0x8a/0x6e0 net/ipv4/tcp_input.c:4914\n tcp_data_queue+0x11fd/0x4bb0 net/ipv4/tcp_input.c:5025\n tcp_rcv_established+0x81e/0x1ff0 net/ipv4/tcp_input.c:5947\n tcp_v4_do_rcv+0x65e/0x980 net/ipv4/tcp_ipv4.c:1719\n sk_backlog_rcv include/net/sock.h:1037 [inline]\n __release_sock+0x134/0x3b0 net/core/sock.c:2779\n release_sock+0x54/0x1b0 net/core/sock.c:3311\n sk_wait_data+0x177/0x450 net/core/sock.c:2821\n tcp_recvmsg_locked+0xe28/0x1fd0 net/ipv4/tcp.c:2457\n tcp_recvmsg+0x137/0x610 net/ipv4/tcp.c:2572\n inet_recvmsg+0x11b/0x5e0 net/ipv4/af_inet.c:850\n sock_recvmsg_nosec net/socket.c:948 [inline]\n sock_recvmsg net/socket.c:966 [inline]\n sock_recvmsg net/socket.c:962 [inline]\n ____sys_recvmsg+0x2c4/0x600 net/socket.c:2632\n ___sys_recvmsg+0x127/0x200 net/socket.c:2674\n __sys_recvmsg+0xe2/0x1a0 net/socket.c:2704\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x44/0xae","Type":"Description","Title":"net: preserve skb_end_offset() in skb_unclone_keeptruesize()"}]}}}