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CVE-2026-64559

s390/pkey: Check length in PKEY_VERIFYPROTK ioctl

HIGH
7.8
CVSS Score
Published: July 29, 2026 at 04:31 PM UTC
Updated: October 19, 2026 at 09:17 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH7.8
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
90%
6.128fcc231ce3bea12b78bb94b280cdc03cff342435
Vendor states this is fixed in 0a9e34ccbe772b8f321388cdbdf4f22b94e513e7 (fixed)
Vendor states this is fixed in 693bf91d4db134f9b1c2840c8e287eee3d993bac (fixed)
Vendor states this is fixed in 7e7e03848c918aa0acad5ffd75d929e3afec1554 (fixed)
Vendor states this is fixed in b3d4ab2d7df9426f7f1d3671d7e2108f2ca6e970 (fixed)
Vendor states this is fixed in 6.12 (unaffected)
Vendor states this is fixed in 6.12.97 (unaffected)
Vendor states this is fixed in 6.18.40 (unaffected)
Vendor states this is fixed in 7.1.5 (unaffected)
Vendor states this is fixed in 7.2 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHLinux
Vector?

Quick Info

StatusRECEIVED
CWE
CWE-125

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