{"id":"CVE-2026-63823","revision":"2ad4280fccba412ba236955c7e74f77c","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":[]}