{"id":"CVE-2026-63823","revision":null,"records":[{"revision":"2ad4280fccba412ba236955c7e74f77c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-63823","aliases":[],"title":"keys: Pin request_key_auth payload in instantiate paths","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nkeys: Pin request_key_auth payload in instantiate paths\n\nA: request_key() B: KEYCTL_INSTANTIATE_IOV\n================ =========================\n\ncreate auth key\nstore rka in auth key\nwait for helper\n get auth key\n load rka from auth key\n copy user payload\n sleep on #PF\n\nhelper completed\ndetach and free rka\ndestroy auth key\n wake up\n use rka->target_key\n **USE-AFTER-FREE**\n\nGive request_key_auth payloads a refcount. Take a payload reference while\nauthkey->sem stabilizes the payload and revocation state. Hold that\nreference across the instantiate and reject paths. Drop the auth key\nowning reference from revoke and destroy.\n\n[jarkko: Replaced the first two paragraphs of text with an actual\n concurrency scenario.]","state":0,"publishedAt":"2026-07-19T12:02:19.847+00:00","modifiedAt":"2026-10-19T20:07:48.726+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/keys/request_key_auth-type.h\",\n \"security/keys/internal.h\",\n \"security/keys/keyctl.c\",\n \"security/keys/request_key_auth.c\"\n ],\n \"versions\": [\n {\n \"version\": \"b5f545c880a2a47947ba2118b2509644ab7a2969\",\n \"lessThan\": \"d8274181b0f28d450b42489723a5ba81042158d7\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b5f545c880a2a47947ba2118b2509644ab7a2969\",\n \"lessThan\": \"4982bfabce6b33b3c9eddb4fb900fe5568b7cf91\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b5f545c880a2a47947ba2118b2509644ab7a2969\",\n \"lessThan\": \"708709c65a1832a99b0eef8ae46e343ddaca3d06\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b5f545c880a2a47947ba2118b2509644ab7a2969\",\n \"lessThan\": \"35ab4db86774d82389e4b9559e26ab7f68d8e395\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b5f545c880a2a47947ba2118b2509644ab7a2969\",\n \"lessThan\": \"f9b68632ac93cc742f2e411021c4dbfe452ea0c2\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b5f545c880a2a47947ba2118b2509644ab7a2969\",\n \"lessThan\": \"7216ce8cb12fee44e309503955bb83806b106129\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b5f545c880a2a47947ba2118b2509644ab7a2969\",\n \"lessThan\": \"83c0a1cb296d955d5f4d1f0bd8a769ba8ed8c29f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b5f545c880a2a47947ba2118b2509644ab7a2969\",\n \"lessThan\": \"fd15b457a86939c38aa12116adabd8ff686c5e51\",\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 \"include/keys/request_key_auth-type.h\",\n \"security/keys/internal.h\",\n \"security/keys/keyctl.c\",\n \"security/keys/request_key_auth.c\"\n ],\n \"versions\": [\n {\n \"version\": \"2.6.16\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"2.6.16\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.260\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.211\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.177\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.144\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.95\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.38\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.3\",\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/d8274181b0f28d450b42489723a5ba81042158d7","https://git.kernel.org/stable/c/4982bfabce6b33b3c9eddb4fb900fe5568b7cf91","https://git.kernel.org/stable/c/708709c65a1832a99b0eef8ae46e343ddaca3d06","https://git.kernel.org/stable/c/35ab4db86774d82389e4b9559e26ab7f68d8e395","https://git.kernel.org/stable/c/f9b68632ac93cc742f2e411021c4dbfe452ea0c2","https://git.kernel.org/stable/c/7216ce8cb12fee44e309503955bb83806b106129","https://git.kernel.org/stable/c/83c0a1cb296d955d5f4d1f0bd8a769ba8ed8c29f","https://git.kernel.org/stable/c/fd15b457a86939c38aa12116adabd8ff686c5e51"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63823","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-63823","identifiers":["CVE-2026-63823"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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