{"id":"CVE-2026-64015","summary":"security/keys: fix missed RCU read section on lookup","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsecurity/keys: fix missed RCU read section on lookup\n\nNicholas Carlini reports that the keyring code calls assoc_array_find()\nin find_key_to_update() without holding the RCU read lock, while the\nassoc_array_gc() code really is designed around removing the node from\nthe tree and then freeing it after an RCU grace-period.\n\nThe regular key handling doesn't see this because holding the keyring\nsemaphore hides any lifetime issues, but the persistent key handling\nuses a different model.\n\nInstead of extending the keyring locking, just do the simple RCU locking\nthat the assoc_array was designed for.","modified":"2026-07-22T05:30:06.862029990Z","published":"2026-07-19T15:39:10.557Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64015.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/43a1e3744548e6fd85873e6fb43e293eb4010694"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4c5d407ba3ff7f30561ff73ba1b07ed70c864edc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/50bb3435a5e627bfbdc52eb4536f49f88b3486b8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5659e6923cb72f8e18e8b539109ab512455fe195"},{"type":"WEB","url":"https://git.kernel.org/stable/c/66288dcadf80974436250e9f70ed848836b835b5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cefa4265b11176c897a7d9e8e54d89e3701c5584"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64015.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64015"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b2a4df200d570b2c33a57e1ebfa5896e4bc81b69"},{"fixed":"4c5d407ba3ff7f30561ff73ba1b07ed70c864edc"},{"fixed":"cefa4265b11176c897a7d9e8e54d89e3701c5584"},{"fixed":"5659e6923cb72f8e18e8b539109ab512455fe195"},{"fixed":"50bb3435a5e627bfbdc52eb4536f49f88b3486b8"},{"fixed":"66288dcadf80974436250e9f70ed848836b835b5"},{"fixed":"43a1e3744548e6fd85873e6fb43e293eb4010694"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64015.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.13.0"},{"fixed":"6.1.175"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.142"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.92"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.34"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64015.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}