High 7.8Published Jul 29, 2026

CVE-2026-64559s390/pkey: Check length in PKEY_VERIFYPROTK ioctl

Updated under an hour ago (Oct 27, 2026, 9:00 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Check length in PKEY_VERIFYPROTK ioctl Explicitly check the buffer length request structure provided by user-space and fail, if it exceeds the buffer size.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	8fcc231ce3bea12b78bb94b280cdc03cff342435 builds before 0a9e34ccbe772b8f321388cdbdf4f22b94e513e7; from 8fcc231ce3bea12b78bb94b280cdc03cff342435 before 693bf91d4db134f9b1c2840c8e287eee3d993bac; 8fcc231ce3bea12b78bb94b280cdc03cff342435 builds before 7e7e03848c918aa0acad5ffd75d929e3afec1554; from 8fcc231ce3bea12b78bb94b280cdc03cff342435 before b3d4ab2d7df9426f7f1d3671d7e2108f2ca6e970	CNA record

References

References

https://git.kernel.org/stable/c/0a9e34ccbe772b8f321388cdbdf4f22b94e513e7
https://git.kernel.org/stable/c/693bf91d4db134f9b1c2840c8e287eee3d993bac
https://git.kernel.org/stable/c/7e7e03848c918aa0acad5ffd75d929e3afec1554
https://git.kernel.org/stable/c/b3d4ab2d7df9426f7f1d3671d7e2108f2ca6e970

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.