{"id":"CVE-2026-68338","revision":null,"records":[{"revision":"ed3aa143e9c4408eb522eb1abb6c7c47","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-68338","aliases":[],"title":"net/packet: avoid fanout hook re-registration after unregister","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/packet: avoid fanout hook re-registration after unregister\n\npacket_set_ring() temporarily detaches a socket from packet delivery while\nreconfiguring its ring. It records the previous running state, clears\npo->num, unregisters the protocol hook when needed, drops po->bind_lock,\nand later restores po->num and re-registers the hook from the saved\nwas_running value.\n\nThat unlocked window can race with NETDEV_UNREGISTER. The notifier can\nobserve the socket as not running, skip __unregister_prot_hook(), and\ninvalidate the per-socket binding by setting po->ifindex to -1 and clearing\npo->prot_hook.dev. A one-member fanout group can still retain its shared\nfanout hook device pointer. When packet_set_ring() resumes, re-registering\nsolely from the stale was_running state can re-add the fanout hook after\nthe device has been unregistered.\n\nTreat po->ifindex == -1 as an invalidated binding after reacquiring\npo->bind_lock. This is distinct from ifindex 0, the normal\nunbound/wildcard state: ifindex -1 marks an existing device binding that\nwas invalidated when the device was unregistered. Restore po->num as\nbefore, but do not re-register the hook if device unregister already\ndetached the socket.","state":0,"publishedAt":"2026-08-10T12:03:14.549+00:00","modifiedAt":"2026-10-19T21:09:05.428+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 \"net/packet/af_packet.c\"\n ],\n \"versions\": [\n {\n \"version\": \"dc99f600698dcac69b8f56dda9a8a00d645c5ffc\",\n \"lessThan\": \"acb40ebfa5c4d62f84339fcbf713f2a9fd033a71\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"dc99f600698dcac69b8f56dda9a8a00d645c5ffc\",\n \"lessThan\": \"c820f4b7f2fa38f8769db0d0cefdd94e2721504d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"dc99f600698dcac69b8f56dda9a8a00d645c5ffc\",\n \"lessThan\": \"4628efbdc7affd094181f5263e65c1062e31f15f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"dc99f600698dcac69b8f56dda9a8a00d645c5ffc\",\n \"lessThan\": \"80ec024d53a05c60ad1d08968dcf745f10c1665c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"dc99f600698dcac69b8f56dda9a8a00d645c5ffc\",\n \"lessThan\": \"0a052e0808e015e68144a9877e6ef42b952c49fa\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"dc99f600698dcac69b8f56dda9a8a00d645c5ffc\",\n \"lessThan\": \"1bc55c29cd85818e9052f17deb287d5a11fb817f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"dc99f600698dcac69b8f56dda9a8a00d645c5ffc\",\n \"lessThan\": \"a885387dae7986a55bae5c77a15bdd447f64e9b9\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"dc99f600698dcac69b8f56dda9a8a00d645c5ffc\",\n \"lessThan\": \"50aff80475abd3533eef4320477037e6fcc6b56e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\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 \"net/packet/af_packet.c\"\n ],\n \"versions\": [\n {\n \"version\": \"3.1\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"3.1\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.265\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.216\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.183\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.148\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.101\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.42\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.6\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\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:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/acb40ebfa5c4d62f84339fcbf713f2a9fd033a71","https://git.kernel.org/stable/c/c820f4b7f2fa38f8769db0d0cefdd94e2721504d","https://git.kernel.org/stable/c/4628efbdc7affd094181f5263e65c1062e31f15f","https://git.kernel.org/stable/c/80ec024d53a05c60ad1d08968dcf745f10c1665c","https://git.kernel.org/stable/c/0a052e0808e015e68144a9877e6ef42b952c49fa","https://git.kernel.org/stable/c/1bc55c29cd85818e9052f17deb287d5a11fb817f","https://git.kernel.org/stable/c/a885387dae7986a55bae5c77a15bdd447f64e9b9","https://git.kernel.org/stable/c/50aff80475abd3533eef4320477037e6fcc6b56e"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68338","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-68338","identifiers":["CVE-2026-68338"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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