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CVE-2026-64558

s390/pkey: Check length in pkey_pckmo handler implementation

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_pckmo handler implementation Explicitly check the length of the target buffer in the pkey_pckmo implementation of the key_to_protkey() handler function. The handler function fails, if the generated output data exceeds the length of the provided target buffer.

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 02028a24e26d85262ab9c8fc4344e1f3503007fc (fixed)
Vendor states this is fixed in 1ac287e2af9a9112fe271427ef45eceb26bce8b4 (fixed)
Vendor states this is fixed in 433e5e70cdc1edf382d28d08a885b22e2b98b7da (fixed)
Vendor states this is fixed in 614aa0491c7a190556c2345dddee0b6f5ed90989 (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/02028a24e26d85262ab9c8fc4344e1f3503007fc
Source: cverecord
https://git.kernel.org/stable/c/433e5e70cdc1edf382d28d08a885b22e2b98b7da
Source: cverecord
https://git.kernel.org/stable/c/614aa0491c7a190556c2345dddee0b6f5ed90989
Source: cverecord
https://git.kernel.org/stable/c/1ac287e2af9a9112fe271427ef45eceb26bce8b4

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-122

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