CVE-2026-64558 is a vulnerability in Linux Kernel
Published on July 29, 2026
s390/pkey: Check length in pkey_pckmo handler implementation
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.
Products Associated with CVE-2026-64558
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Affected Versions
Linux:- Version 8fcc231ce3bea12b78bb94b280cdc03cff342435 and below 02028a24e26d85262ab9c8fc4344e1f3503007fc is affected.
- Version 8fcc231ce3bea12b78bb94b280cdc03cff342435 and below 433e5e70cdc1edf382d28d08a885b22e2b98b7da is affected.
- Version 8fcc231ce3bea12b78bb94b280cdc03cff342435 and below 614aa0491c7a190556c2345dddee0b6f5ed90989 is affected.
- Version 8fcc231ce3bea12b78bb94b280cdc03cff342435 and below 1ac287e2af9a9112fe271427ef45eceb26bce8b4 is affected.
- Version 6.12 is affected.
- Before 6.12 is unaffected.
- Version 6.12.97, <= 6.12.* is unaffected.
- Version 6.18.40, <= 6.18.* is unaffected.
- Version 7.1.5, <= 7.1.* is unaffected.
- Version 7.2-rc1, <= * is unaffected.