{"api_version":"1","generated_at":"2026-11-11T05:49:06+00:00","cve":"CVE-2025-38622","urls":{"html":"https://cve.report/CVE-2025-38622","api":"https://cve.report/api/cve/CVE-2025-38622.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2025-38622","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-38622"},"summary":{"title":"net: drop UFO packets in udp_rcv_segment()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: drop UFO packets in udp_rcv_segment()\n\nWhen sending a packet with virtio_net_hdr to tun device, if the gso_type\nin virtio_net_hdr is SKB_GSO_UDP and the gso_size is less than udphdr\nsize, below crash may happen.\n\n  ------------[ cut here ]------------\n  kernel BUG at net/core/skbuff.c:4572!\n  Oops: invalid opcode: 0000 [#1] SMP NOPTI\n  CPU: 0 UID: 0 PID: 62 Comm: mytest Not tainted 6.16.0-rc7 #203 PREEMPT(voluntary)\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\n  RIP: 0010:skb_pull_rcsum+0x8e/0xa0\n  Code: 00 00 5b c3 cc cc cc cc 8b 93 88 00 00 00 f7 da e8 37 44 38 00 f7 d8 89 83 88 00 00 00 48 8b 83 c8 00 00 00 5b c3 cc cc cc cc <0f> 0b 0f 0b 66 66 2e 0f 1f 84 00 000\n  RSP: 0018:ffffc900001fba38 EFLAGS: 00000297\n  RAX: 0000000000000004 RBX: ffff8880040c1000 RCX: ffffc900001fb948\n  RDX: ffff888003e6d700 RSI: 0000000000000008 RDI: ffff88800411a062\n  RBP: ffff8880040c1000 R08: 0000000000000000 R09: 0000000000000001\n  R10: ffff888003606c00 R11: 0000000000000001 R12: 0000000000000000\n  R13: ffff888004060900 R14: ffff888004050000 R15: ffff888004060900\n  FS:  000000002406d3c0(0000) GS:ffff888084a19000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 0000000020000040 CR3: 0000000004007000 CR4: 00000000000006f0\n  Call Trace:\n   <TASK>\n   udp_queue_rcv_one_skb+0x176/0x4b0 net/ipv4/udp.c:2445\n   udp_queue_rcv_skb+0x155/0x1f0 net/ipv4/udp.c:2475\n   udp_unicast_rcv_skb+0x71/0x90 net/ipv4/udp.c:2626\n   __udp4_lib_rcv+0x433/0xb00 net/ipv4/udp.c:2690\n   ip_protocol_deliver_rcu+0xa6/0x160 net/ipv4/ip_input.c:205\n   ip_local_deliver_finish+0x72/0x90 net/ipv4/ip_input.c:233\n   ip_sublist_rcv_finish+0x5f/0x70 net/ipv4/ip_input.c:579\n   ip_sublist_rcv+0x122/0x1b0 net/ipv4/ip_input.c:636\n   ip_list_rcv+0xf7/0x130 net/ipv4/ip_input.c:670\n   __netif_receive_skb_list_core+0x21d/0x240 net/core/dev.c:6067\n   netif_receive_skb_list_internal+0x186/0x2b0 net/core/dev.c:6210\n   napi_complete_done+0x78/0x180 net/core/dev.c:6580\n   tun_get_user+0xa63/0x1120 drivers/net/tun.c:1909\n   tun_chr_write_iter+0x65/0xb0 drivers/net/tun.c:1984\n   vfs_write+0x300/0x420 fs/read_write.c:593\n   ksys_write+0x60/0xd0 fs/read_write.c:686\n   do_syscall_64+0x50/0x1c0 arch/x86/entry/syscall_64.c:63\n   </TASK>\n\nTo trigger gso segment in udp_queue_rcv_skb(), we should also set option\nUDP_ENCAP_ESPINUDP to enable udp_sk(sk)->encap_rcv. When the encap_rcv\nhook return 1 in udp_queue_rcv_one_skb(), udp_csum_pull_header() will try\nto pull udphdr, but the skb size has been segmented to gso size, which\nleads to this crash.\n\nPrevious commit cf329aa42b66 (\"udp: cope with UDP GRO packet misdirection\")\nintroduces segmentation in UDP receive path only for GRO, which was never\nintended to be used for UFO, so drop UFO packets in udp_rcv_segment().","state":"PUBLISHED","assigner":"Linux","published_at":"2025-08-22 16:15:35","updated_at":"2026-11-05 22:17:20"},"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"}}],"references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html","name":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/791f32c5eab33ca3a153f8f6f763aa0df1ddc320","name":"https://git.kernel.org/stable/c/791f32c5eab33ca3a153f8f6f763aa0df1ddc320","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/72f97d3cb791e26492236b2be7fd70d2c6222555","name":"https://git.kernel.org/stable/c/72f97d3cb791e26492236b2be7fd70d2c6222555","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d46e51f1c78b9ab9323610feb14238d06d46d519","name":"https://git.kernel.org/stable/c/d46e51f1c78b9ab9323610feb14238d06d46d519","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/df6ad849d59256dcc0e2234844ef9f0daf885f5c","name":"https://git.kernel.org/stable/c/df6ad849d59256dcc0e2234844ef9f0daf885f5c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fc45b3f9599b657d4a64bcf423d2a977b3e13a49","name":"https://git.kernel.org/stable/c/fc45b3f9599b657d4a64bcf423d2a977b3e13a49","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c0ec2e47f1e92d69b42b17a4a1e543256778393e","name":"https://git.kernel.org/stable/c/c0ec2e47f1e92d69b42b17a4a1e543256778393e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4c1022220b1b6fea802175e80444923a3bbf93a5","name":"https://git.kernel.org/stable/c/4c1022220b1b6fea802175e80444923a3bbf93a5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html","name":"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0d45954034f8edd6d4052e0190d3d6335c37e4de","name":"https://git.kernel.org/stable/c/0d45954034f8edd6d4052e0190d3d6335c37e4de","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0c639c6479ec4480372901a5fc566f7588cf5522","name":"https://git.kernel.org/stable/c/0c639c6479ec4480372901a5fc566f7588cf5522","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-38622","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-38622","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cf329aa42b6659204fee865bbce0ea20462552eb 72f97d3cb791e26492236b2be7fd70d2c6222555 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cf329aa42b6659204fee865bbce0ea20462552eb df6ad849d59256dcc0e2234844ef9f0daf885f5c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cf329aa42b6659204fee865bbce0ea20462552eb 4c1022220b1b6fea802175e80444923a3bbf93a5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cf329aa42b6659204fee865bbce0ea20462552eb 791f32c5eab33ca3a153f8f6f763aa0df1ddc320 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cf329aa42b6659204fee865bbce0ea20462552eb 0d45954034f8edd6d4052e0190d3d6335c37e4de git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cf329aa42b6659204fee865bbce0ea20462552eb c0ec2e47f1e92d69b42b17a4a1e543256778393e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cf329aa42b6659204fee865bbce0ea20462552eb fc45b3f9599b657d4a64bcf423d2a977b3e13a49 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cf329aa42b6659204fee865bbce0ea20462552eb 0c639c6479ec4480372901a5fc566f7588cf5522 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cf329aa42b6659204fee865bbce0ea20462552eb d46e51f1c78b9ab9323610feb14238d06d46d519 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.0","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.0 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.4.297 5.4.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.241 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.190 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.148 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.102 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.42 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.15.10 6.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.16.1 6.16.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.17 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2025","cve_id":"38622","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":{"adp":[{"providerMetadata":{"dateUpdated":"2025-11-03T17:40:32.369Z","orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE"},"references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"},{"url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}],"title":"CVE Program Container"},{"metrics":[{"other":{"content":{"id":"CVE-2025-38622","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-11-05T21:05:12.360041Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-11-05T21:12:49.192Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["include/net/udp.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"72f97d3cb791e26492236b2be7fd70d2c6222555","status":"affected","version":"cf329aa42b6659204fee865bbce0ea20462552eb","versionType":"git"},{"lessThan":"df6ad849d59256dcc0e2234844ef9f0daf885f5c","status":"affected","version":"cf329aa42b6659204fee865bbce0ea20462552eb","versionType":"git"},{"lessThan":"4c1022220b1b6fea802175e80444923a3bbf93a5","status":"affected","version":"cf329aa42b6659204fee865bbce0ea20462552eb","versionType":"git"},{"lessThan":"791f32c5eab33ca3a153f8f6f763aa0df1ddc320","status":"affected","version":"cf329aa42b6659204fee865bbce0ea20462552eb","versionType":"git"},{"lessThan":"0d45954034f8edd6d4052e0190d3d6335c37e4de","status":"affected","version":"cf329aa42b6659204fee865bbce0ea20462552eb","versionType":"git"},{"lessThan":"c0ec2e47f1e92d69b42b17a4a1e543256778393e","status":"affected","version":"cf329aa42b6659204fee865bbce0ea20462552eb","versionType":"git"},{"lessThan":"fc45b3f9599b657d4a64bcf423d2a977b3e13a49","status":"affected","version":"cf329aa42b6659204fee865bbce0ea20462552eb","versionType":"git"},{"lessThan":"0c639c6479ec4480372901a5fc566f7588cf5522","status":"affected","version":"cf329aa42b6659204fee865bbce0ea20462552eb","versionType":"git"},{"lessThan":"d46e51f1c78b9ab9323610feb14238d06d46d519","status":"affected","version":"cf329aa42b6659204fee865bbce0ea20462552eb","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["include/net/udp.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.0"},{"lessThan":"5.0","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.4.*","status":"unaffected","version":"5.4.297","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.241","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.190","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.148","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.102","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.42","versionType":"semver"},{"lessThanOrEqual":"6.15.*","status":"unaffected","version":"6.15.10","versionType":"semver"},{"lessThanOrEqual":"6.16.*","status":"unaffected","version":"6.16.1","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"6.17","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.4.297","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.241","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.190","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.148","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.102","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.42","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.15.10","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.16.1","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.17","versionStartIncluding":"5.0","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: drop UFO packets in udp_rcv_segment()\n\nWhen sending a packet with virtio_net_hdr to tun device, if the gso_type\nin virtio_net_hdr is SKB_GSO_UDP and the gso_size is less than udphdr\nsize, below crash may happen.\n\n  ------------[ cut here ]------------\n  kernel BUG at net/core/skbuff.c:4572!\n  Oops: invalid opcode: 0000 [#1] SMP NOPTI\n  CPU: 0 UID: 0 PID: 62 Comm: mytest Not tainted 6.16.0-rc7 #203 PREEMPT(voluntary)\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\n  RIP: 0010:skb_pull_rcsum+0x8e/0xa0\n  Code: 00 00 5b c3 cc cc cc cc 8b 93 88 00 00 00 f7 da e8 37 44 38 00 f7 d8 89 83 88 00 00 00 48 8b 83 c8 00 00 00 5b c3 cc cc cc cc <0f> 0b 0f 0b 66 66 2e 0f 1f 84 00 000\n  RSP: 0018:ffffc900001fba38 EFLAGS: 00000297\n  RAX: 0000000000000004 RBX: ffff8880040c1000 RCX: ffffc900001fb948\n  RDX: ffff888003e6d700 RSI: 0000000000000008 RDI: ffff88800411a062\n  RBP: ffff8880040c1000 R08: 0000000000000000 R09: 0000000000000001\n  R10: ffff888003606c00 R11: 0000000000000001 R12: 0000000000000000\n  R13: ffff888004060900 R14: ffff888004050000 R15: ffff888004060900\n  FS:  000000002406d3c0(0000) GS:ffff888084a19000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 0000000020000040 CR3: 0000000004007000 CR4: 00000000000006f0\n  Call Trace:\n   <TASK>\n   udp_queue_rcv_one_skb+0x176/0x4b0 net/ipv4/udp.c:2445\n   udp_queue_rcv_skb+0x155/0x1f0 net/ipv4/udp.c:2475\n   udp_unicast_rcv_skb+0x71/0x90 net/ipv4/udp.c:2626\n   __udp4_lib_rcv+0x433/0xb00 net/ipv4/udp.c:2690\n   ip_protocol_deliver_rcu+0xa6/0x160 net/ipv4/ip_input.c:205\n   ip_local_deliver_finish+0x72/0x90 net/ipv4/ip_input.c:233\n   ip_sublist_rcv_finish+0x5f/0x70 net/ipv4/ip_input.c:579\n   ip_sublist_rcv+0x122/0x1b0 net/ipv4/ip_input.c:636\n   ip_list_rcv+0xf7/0x130 net/ipv4/ip_input.c:670\n   __netif_receive_skb_list_core+0x21d/0x240 net/core/dev.c:6067\n   netif_receive_skb_list_internal+0x186/0x2b0 net/core/dev.c:6210\n   napi_complete_done+0x78/0x180 net/core/dev.c:6580\n   tun_get_user+0xa63/0x1120 drivers/net/tun.c:1909\n   tun_chr_write_iter+0x65/0xb0 drivers/net/tun.c:1984\n   vfs_write+0x300/0x420 fs/read_write.c:593\n   ksys_write+0x60/0xd0 fs/read_write.c:686\n   do_syscall_64+0x50/0x1c0 arch/x86/entry/syscall_64.c:63\n   </TASK>\n\nTo trigger gso segment in udp_queue_rcv_skb(), we should also set option\nUDP_ENCAP_ESPINUDP to enable udp_sk(sk)->encap_rcv. When the encap_rcv\nhook return 1 in udp_queue_rcv_one_skb(), udp_csum_pull_header() will try\nto pull udphdr, but the skb size has been segmented to gso size, which\nleads to this crash.\n\nPrevious commit cf329aa42b66 (\"udp: cope with UDP GRO packet misdirection\")\nintroduces segmentation in UDP receive path only for GRO, which was never\nintended to be used for UFO, so drop UFO packets in udp_rcv_segment()."}],"providerMetadata":{"dateUpdated":"2026-05-11T21:31:47.095Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/72f97d3cb791e26492236b2be7fd70d2c6222555"},{"url":"https://git.kernel.org/stable/c/df6ad849d59256dcc0e2234844ef9f0daf885f5c"},{"url":"https://git.kernel.org/stable/c/4c1022220b1b6fea802175e80444923a3bbf93a5"},{"url":"https://git.kernel.org/stable/c/791f32c5eab33ca3a153f8f6f763aa0df1ddc320"},{"url":"https://git.kernel.org/stable/c/0d45954034f8edd6d4052e0190d3d6335c37e4de"},{"url":"https://git.kernel.org/stable/c/c0ec2e47f1e92d69b42b17a4a1e543256778393e"},{"url":"https://git.kernel.org/stable/c/fc45b3f9599b657d4a64bcf423d2a977b3e13a49"},{"url":"https://git.kernel.org/stable/c/0c639c6479ec4480372901a5fc566f7588cf5522"},{"url":"https://git.kernel.org/stable/c/d46e51f1c78b9ab9323610feb14238d06d46d519"}],"title":"net: drop UFO packets in udp_rcv_segment()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2025-38622","datePublished":"2025-08-22T16:00:31.343Z","dateReserved":"2025-04-16T04:51:24.029Z","dateUpdated":"2026-11-05T21:12:49.192Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-08-22 16:15:35","lastModifiedDate":"2026-11-05 22:17:20","problem_types":["NVD-CWE-noinfo"],"metrics":{"cvssMetricV31":[{"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}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-11-05T21:05:12.360041Z","id":"CVE-2025-38622","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA 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drop UFO packets in udp_rcv_segment()","CVE":"CVE-2025-38622","Year":"2025"},"notes":[{"CveYear":"2025","CveId":"38622","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: drop UFO packets in udp_rcv_segment()\n\nWhen sending a packet with virtio_net_hdr to tun device, if the gso_type\nin virtio_net_hdr is SKB_GSO_UDP and the gso_size is less than udphdr\nsize, below crash may happen.\n\n  ------------[ cut here ]------------\n  kernel BUG at net/core/skbuff.c:4572!\n  Oops: invalid opcode: 0000 [#1] SMP NOPTI\n  CPU: 0 UID: 0 PID: 62 Comm: mytest Not tainted 6.16.0-rc7 #203 PREEMPT(voluntary)\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\n  RIP: 0010:skb_pull_rcsum+0x8e/0xa0\n  Code: 00 00 5b c3 cc cc cc cc 8b 93 88 00 00 00 f7 da e8 37 44 38 00 f7 d8 89 83 88 00 00 00 48 8b 83 c8 00 00 00 5b c3 cc cc cc cc <0f> 0b 0f 0b 66 66 2e 0f 1f 84 00 000\n  RSP: 0018:ffffc900001fba38 EFLAGS: 00000297\n  RAX: 0000000000000004 RBX: ffff8880040c1000 RCX: ffffc900001fb948\n  RDX: ffff888003e6d700 RSI: 0000000000000008 RDI: ffff88800411a062\n  RBP: ffff8880040c1000 R08: 0000000000000000 R09: 0000000000000001\n  R10: ffff888003606c00 R11: 0000000000000001 R12: 0000000000000000\n  R13: ffff888004060900 R14: ffff888004050000 R15: ffff888004060900\n  FS:  000000002406d3c0(0000) GS:ffff888084a19000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 0000000020000040 CR3: 0000000004007000 CR4: 00000000000006f0\n  Call Trace:\n   <TASK>\n   udp_queue_rcv_one_skb+0x176/0x4b0 net/ipv4/udp.c:2445\n   udp_queue_rcv_skb+0x155/0x1f0 net/ipv4/udp.c:2475\n   udp_unicast_rcv_skb+0x71/0x90 net/ipv4/udp.c:2626\n   __udp4_lib_rcv+0x433/0xb00 net/ipv4/udp.c:2690\n   ip_protocol_deliver_rcu+0xa6/0x160 net/ipv4/ip_input.c:205\n   ip_local_deliver_finish+0x72/0x90 net/ipv4/ip_input.c:233\n   ip_sublist_rcv_finish+0x5f/0x70 net/ipv4/ip_input.c:579\n   ip_sublist_rcv+0x122/0x1b0 net/ipv4/ip_input.c:636\n   ip_list_rcv+0xf7/0x130 net/ipv4/ip_input.c:670\n   __netif_receive_skb_list_core+0x21d/0x240 net/core/dev.c:6067\n   netif_receive_skb_list_internal+0x186/0x2b0 net/core/dev.c:6210\n   napi_complete_done+0x78/0x180 net/core/dev.c:6580\n   tun_get_user+0xa63/0x1120 drivers/net/tun.c:1909\n   tun_chr_write_iter+0x65/0xb0 drivers/net/tun.c:1984\n   vfs_write+0x300/0x420 fs/read_write.c:593\n   ksys_write+0x60/0xd0 fs/read_write.c:686\n   do_syscall_64+0x50/0x1c0 arch/x86/entry/syscall_64.c:63\n   </TASK>\n\nTo trigger gso segment in udp_queue_rcv_skb(), we should also set option\nUDP_ENCAP_ESPINUDP to enable udp_sk(sk)->encap_rcv. When the encap_rcv\nhook return 1 in udp_queue_rcv_one_skb(), udp_csum_pull_header() will try\nto pull udphdr, but the skb size has been segmented to gso size, which\nleads to this crash.\n\nPrevious commit cf329aa42b66 (\"udp: cope with UDP GRO packet misdirection\")\nintroduces segmentation in UDP receive path only for GRO, which was never\nintended to be used for UFO, so drop UFO packets in udp_rcv_segment().","Type":"Description","Title":"net: drop UFO packets in udp_rcv_segment()"}]}}}