{"id":"CVE-2026-53223","revision":null,"records":[{"revision":"8822a9e504a84cf1b17cabeb6a7f3109","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-53223","aliases":[],"title":"net: guard timestamp cmsgs to real error queue skbs","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: guard timestamp cmsgs to real error queue skbs\n\nskb_is_err_queue() treats PACKET_OUTGOING as the sole marker for an skb\nfrom sk_error_queue. That assumption is not true for AF_PACKET sockets:\noutgoing packet taps are also delivered to packet sockets with\nskb->pkt_type == PACKET_OUTGOING, but their skb->cb is owned by AF_PACKET\ninstead of struct sock_exterr_skb.\n\nIf such an skb is received with timestamping enabled, the generic\ntimestamp cmsg path can read AF_PACKET control-buffer state as\nsock_exterr_skb::opt_stats. With SO_RXQ_OVFL enabled, the packet drop\ncounter overlaps opt_stats. An odd drop count makes the path emit\nSCM_TIMESTAMPING_OPT_STATS with skb->len and skb->data. For non-linear\nskbs this copies past the linear head and can trigger hardened usercopy or\ndisclose adjacent heap contents.\n\nKeep skb_is_err_queue() local to net/socket.c, but make it verify that\nthe PACKET_OUTGOING marker is paired with the sock_rmem_free destructor\ninstalled by sock_queue_err_skb(). AF_PACKET receive skbs use normal\nreceive ownership and no longer pass as error-queue skbs, while legitimate\nsk_error_queue entries keep the PACKET_OUTGOING marker and sock_rmem_free\nownership.","state":0,"publishedAt":"2026-06-25T08:39:24.588+00:00","modifiedAt":"2026-10-19T19:57:29.682+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"include/net/sock.h\",\n \"net/core/skbuff.c\",\n \"net/socket.c\"\n ],\n \"versions\": [\n {\n \"version\": \"8605330aac5a5785630aec8f64378a54891937cc\",\n \"lessThan\": \"24a0d548d3a765cd4558224e4f8e06e14cba26e3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8605330aac5a5785630aec8f64378a54891937cc\",\n \"lessThan\": \"71ff5cdd5da61d0438e902aa0fd68c28bc901abe\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8605330aac5a5785630aec8f64378a54891937cc\",\n \"lessThan\": \"ad9a0374ee6d11048e1f74cd5180bad58b9848b4\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8605330aac5a5785630aec8f64378a54891937cc\",\n \"lessThan\": \"b903e9b5629ec8dd6db92174070045bf81ad7060\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8605330aac5a5785630aec8f64378a54891937cc\",\n \"lessThan\": \"e0665b2a8e90bb08bd205062c75662b502d31797\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8605330aac5a5785630aec8f64378a54891937cc\",\n \"lessThan\": \"3dde4fb941fa5649ab809f6cd3e20e0c424a4e31\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8605330aac5a5785630aec8f64378a54891937cc\",\n \"lessThan\": \"eb51a9ad3ceb01bc6c0fb608dbc856e03ee6f24a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8605330aac5a5785630aec8f64378a54891937cc\",\n \"lessThan\": \"1ee90b77b727df903033db873c75caac5c27ec98\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cdaf15b43bd31003220cb080bcbbd57787a2fca9\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"4.10.14\",\n \"lessThan\": \"4.11\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"include/net/sock.h\",\n \"net/core/skbuff.c\",\n \"net/socket.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.11\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.11\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.259\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.210\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.176\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.143\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.94\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.36\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.13\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","score":7.1,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/24a0d548d3a765cd4558224e4f8e06e14cba26e3","https://git.kernel.org/stable/c/71ff5cdd5da61d0438e902aa0fd68c28bc901abe","https://git.kernel.org/stable/c/ad9a0374ee6d11048e1f74cd5180bad58b9848b4","https://git.kernel.org/stable/c/b903e9b5629ec8dd6db92174070045bf81ad7060","https://git.kernel.org/stable/c/e0665b2a8e90bb08bd205062c75662b502d31797","https://git.kernel.org/stable/c/3dde4fb941fa5649ab809f6cd3e20e0c424a4e31","https://git.kernel.org/stable/c/eb51a9ad3ceb01bc6c0fb608dbc856e03ee6f24a","https://git.kernel.org/stable/c/1ee90b77b727df903033db873c75caac5c27ec98"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53223","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-53223","identifiers":["CVE-2026-53223"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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