{"api_version":"1","generated_at":"2026-08-13T21:51:00+00:00","cve":"CVE-2026-68284","urls":{"html":"https://cve.report/CVE-2026-68284","api":"https://cve.report/api/cve/CVE-2026-68284.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-68284","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-68284"},"summary":{"title":"bpf, sockmap: Fix cork use-after-free in tcp_bpf_sendmsg()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Fix cork use-after-free in tcp_bpf_sendmsg()\n\ntcp_bpf_sendmsg() keeps msg_tx across sk_stream_wait_memory(), which\ndrops and reacquires the socket lock.  Its error path tries to decide\nwhether msg_tx names the local temporary message by comparing it with\nthe current value of psock->cork.\n\nThis comparison is unsafe when two threads send on the same socket:\n\n  Thread A                         Thread B\n  msg_tx = psock->cork\n  sk_msg_alloc() fails\n  sk_stream_wait_memory()\n    releases the socket lock      acquires the socket lock\n                                  completes the cork\n                                  psock->cork = NULL\n                                  frees the cork\n    reacquires the socket lock\n  msg_tx != psock->cork\n  sk_msg_free(msg_tx)\n\nThe stale cork is therefore mistaken for the local temporary message\nand freed again.  KASAN reported:\n\n  BUG: KASAN: slab-use-after-free in sk_msg_free+0x49/0x50\n  Read of size 4 at addr ffff88810c908800 by task poc/90\n  Call Trace:\n   sk_msg_free+0x49/0x50\n   tcp_bpf_sendmsg+0x14f5/0x1cc0\n   __sys_sendto+0x32c/0x3a0\n   __x64_sys_sendto+0xdb/0x1b0\n  Allocated by task 89:\n   __kasan_kmalloc+0x8f/0xa0\n   tcp_bpf_sendmsg+0x16b3/0x1cc0\n  Freed by task 91:\n   __kasan_slab_free+0x43/0x70\n   kfree+0x131/0x3c0\n   tcp_bpf_sendmsg+0xec3/0x1cc0\n\nmsg_tx can only name the stack-local tmp or the shared cork. Check for\ntmp directly so a changed psock->cork cannot turn a shared message into\nan apparent local one.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-10 13:20:17","updated_at":"2026-08-10 13:20:17"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/ee762f684eefa59de34d9ed93cab08336e834f47","name":"https://git.kernel.org/stable/c/ee762f684eefa59de34d9ed93cab08336e834f47","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2d66a033864e27ab8d5e44cb36f31d9d2413bee4","name":"https://git.kernel.org/stable/c/2d66a033864e27ab8d5e44cb36f31d9d2413bee4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/786d690257ec7a0c839f8710456e444ce3f1348b","name":"https://git.kernel.org/stable/c/786d690257ec7a0c839f8710456e444ce3f1348b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/752b1159ed5d0c48fe169a3721b96660a9822aa1","name":"https://git.kernel.org/stable/c/752b1159ed5d0c48fe169a3721b96660a9822aa1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cde4d6bcd9b73073c66498f6723c7b364c4dbc18","name":"https://git.kernel.org/stable/c/cde4d6bcd9b73073c66498f6723c7b364c4dbc18","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-68284","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68284","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 604326b41a6fb9b4a78b6179335decee0365cd8c ee762f684eefa59de34d9ed93cab08336e834f47 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 604326b41a6fb9b4a78b6179335decee0365cd8c cde4d6bcd9b73073c66498f6723c7b364c4dbc18 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 604326b41a6fb9b4a78b6179335decee0365cd8c 786d690257ec7a0c839f8710456e444ce3f1348b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 604326b41a6fb9b4a78b6179335decee0365cd8c 752b1159ed5d0c48fe169a3721b96660a9822aa1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 604326b41a6fb9b4a78b6179335decee0365cd8c 2d66a033864e27ab8d5e44cb36f31d9d2413bee4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.20","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.20 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.148 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.101 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.42 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.6 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc5 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/ipv4/tcp_bpf.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"ee762f684eefa59de34d9ed93cab08336e834f47","status":"affected","version":"604326b41a6fb9b4a78b6179335decee0365cd8c","versionType":"git"},{"lessThan":"cde4d6bcd9b73073c66498f6723c7b364c4dbc18","status":"affected","version":"604326b41a6fb9b4a78b6179335decee0365cd8c","versionType":"git"},{"lessThan":"786d690257ec7a0c839f8710456e444ce3f1348b","status":"affected","version":"604326b41a6fb9b4a78b6179335decee0365cd8c","versionType":"git"},{"lessThan":"752b1159ed5d0c48fe169a3721b96660a9822aa1","status":"affected","version":"604326b41a6fb9b4a78b6179335decee0365cd8c","versionType":"git"},{"lessThan":"2d66a033864e27ab8d5e44cb36f31d9d2413bee4","status":"affected","version":"604326b41a6fb9b4a78b6179335decee0365cd8c","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/ipv4/tcp_bpf.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.20"},{"lessThan":"4.20","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.148","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.101","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.42","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc5","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.148","versionStartIncluding":"4.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.101","versionStartIncluding":"4.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.42","versionStartIncluding":"4.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.6","versionStartIncluding":"4.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc5","versionStartIncluding":"4.20","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Fix cork use-after-free in tcp_bpf_sendmsg()\n\ntcp_bpf_sendmsg() keeps msg_tx across sk_stream_wait_memory(), which\ndrops and reacquires the socket lock.  Its error path tries to decide\nwhether msg_tx names the local temporary message by comparing it with\nthe current value of psock->cork.\n\nThis comparison is unsafe when two threads send on the same socket:\n\n  Thread A                         Thread B\n  msg_tx = psock->cork\n  sk_msg_alloc() fails\n  sk_stream_wait_memory()\n    releases the socket lock      acquires the socket lock\n                                  completes the cork\n                                  psock->cork = NULL\n                                  frees the cork\n    reacquires the socket lock\n  msg_tx != psock->cork\n  sk_msg_free(msg_tx)\n\nThe stale cork is therefore mistaken for the local temporary message\nand freed again.  KASAN reported:\n\n  BUG: KASAN: slab-use-after-free in sk_msg_free+0x49/0x50\n  Read of size 4 at addr ffff88810c908800 by task poc/90\n  Call Trace:\n   sk_msg_free+0x49/0x50\n   tcp_bpf_sendmsg+0x14f5/0x1cc0\n   __sys_sendto+0x32c/0x3a0\n   __x64_sys_sendto+0xdb/0x1b0\n  Allocated by task 89:\n   __kasan_kmalloc+0x8f/0xa0\n   tcp_bpf_sendmsg+0x16b3/0x1cc0\n  Freed by task 91:\n   __kasan_slab_free+0x43/0x70\n   kfree+0x131/0x3c0\n   tcp_bpf_sendmsg+0xec3/0x1cc0\n\nmsg_tx can only name the stack-local tmp or the shared cork. Check for\ntmp directly so a changed psock->cork cannot turn a shared message into\nan apparent local one."}],"providerMetadata":{"dateUpdated":"2026-08-10T12:02:16.572Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/ee762f684eefa59de34d9ed93cab08336e834f47"},{"url":"https://git.kernel.org/stable/c/cde4d6bcd9b73073c66498f6723c7b364c4dbc18"},{"url":"https://git.kernel.org/stable/c/786d690257ec7a0c839f8710456e444ce3f1348b"},{"url":"https://git.kernel.org/stable/c/752b1159ed5d0c48fe169a3721b96660a9822aa1"},{"url":"https://git.kernel.org/stable/c/2d66a033864e27ab8d5e44cb36f31d9d2413bee4"}],"title":"bpf, sockmap: Fix cork use-after-free in tcp_bpf_sendmsg()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-68284","datePublished":"2026-08-10T12:02:16.572Z","dateReserved":"2026-07-30T09:28:09.379Z","dateUpdated":"2026-08-10T12:02:16.572Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-10 13:20:17","lastModifiedDate":"2026-08-10 13:20:17","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"68284","Ordinal":"1","Title":"bpf, sockmap: Fix cork use-after-free in tcp_bpf_sendmsg()","CVE":"CVE-2026-68284","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"68284","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Fix cork use-after-free in tcp_bpf_sendmsg()\n\ntcp_bpf_sendmsg() keeps msg_tx across sk_stream_wait_memory(), which\ndrops and reacquires the socket lock.  Its error path tries to decide\nwhether msg_tx names the local temporary message by comparing it with\nthe current value of psock->cork.\n\nThis comparison is unsafe when two threads send on the same socket:\n\n  Thread A                         Thread B\n  msg_tx = psock->cork\n  sk_msg_alloc() fails\n  sk_stream_wait_memory()\n    releases the socket lock      acquires the socket lock\n                                  completes the cork\n                                  psock->cork = NULL\n                                  frees the cork\n    reacquires the socket lock\n  msg_tx != psock->cork\n  sk_msg_free(msg_tx)\n\nThe stale cork is therefore mistaken for the local temporary message\nand freed again.  KASAN reported:\n\n  BUG: KASAN: slab-use-after-free in sk_msg_free+0x49/0x50\n  Read of size 4 at addr ffff88810c908800 by task poc/90\n  Call Trace:\n   sk_msg_free+0x49/0x50\n   tcp_bpf_sendmsg+0x14f5/0x1cc0\n   __sys_sendto+0x32c/0x3a0\n   __x64_sys_sendto+0xdb/0x1b0\n  Allocated by task 89:\n   __kasan_kmalloc+0x8f/0xa0\n   tcp_bpf_sendmsg+0x16b3/0x1cc0\n  Freed by task 91:\n   __kasan_slab_free+0x43/0x70\n   kfree+0x131/0x3c0\n   tcp_bpf_sendmsg+0xec3/0x1cc0\n\nmsg_tx can only name the stack-local tmp or the shared cork. Check for\ntmp directly so a changed psock->cork cannot turn a shared message into\nan apparent local one.","Type":"Description","Title":"bpf, sockmap: Fix cork use-after-free in tcp_bpf_sendmsg()"}]}}}