{"id":"CVE-2026-64559","title":"s390/pkey: Check length in PKEY_VERIFYPROTK ioctl","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/pkey: Check length in PKEY_VERIFYPROTK ioctl\n\nExplicitly check the buffer length request structure provided by\nuser-space and fail, if it exceeds the buffer size.","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 8fcc231ce3bea12b78bb94b280cdc03cff342435 < 0a9e34ccbe772b8f321388cdbdf4f22b94e513e7","Linux >= 8fcc231ce3bea12b78bb94b280cdc03cff342435 < 693bf91d4db134f9b1c2840c8e287eee3d993bac","Linux >= 8fcc231ce3bea12b78bb94b280cdc03cff342435 < 7e7e03848c918aa0acad5ffd75d929e3afec1554","Linux >= 8fcc231ce3bea12b78bb94b280cdc03cff342435 < b3d4ab2d7df9426f7f1d3671d7e2108f2ca6e970","Linux 6.12"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:42:43.749651Z"},"published":"2026-07-29","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:52:52.832Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64559","references":[{"url":"https://git.kernel.org/stable/c/0a9e34ccbe772b8f321388cdbdf4f22b94e513e7"},{"url":"https://git.kernel.org/stable/c/693bf91d4db134f9b1c2840c8e287eee3d993bac"},{"url":"https://git.kernel.org/stable/c/7e7e03848c918aa0acad5ffd75d929e3afec1554"},{"url":"https://git.kernel.org/stable/c/b3d4ab2d7df9426f7f1d3671d7e2108f2ca6e970"}],"tags":["cve.org"],"epss":0.0012,"epssPercentile":0.01677,"ingestedAt":"2026-10-16T17:24:46.835Z","slug":"CVE-2026-64559","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ns390/pkey: Check length in PKEY_VERIFYPROTK ioctl\n\nExplicitly check the buffer length request structure provided by\nuser-space and fail, if it exceeds the buffer size.\n\n## Affected\n\n- `Linux >= 8fcc231ce3bea12b78bb94b280cdc03cff342435 < 0a9e34ccbe772b8f321388cdbdf4f22b94e513e7`\n- `Linux >= 8fcc231ce3bea12b78bb94b280cdc03cff342435 < 693bf91d4db134f9b1c2840c8e287eee3d993bac`\n- `Linux >= 8fcc231ce3bea12b78bb94b280cdc03cff342435 < 7e7e03848c918aa0acad5ffd75d929e3afec1554`\n- `Linux >= 8fcc231ce3bea12b78bb94b280cdc03cff342435 < b3d4ab2d7df9426f7f1d3671d7e2108f2ca6e970`\n- `Linux 6.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}