CVE-2026-64559 is a vulnerability in Linux Kernel
Published on July 29, 2026
s390/pkey: Check length in PKEY_VERIFYPROTK ioctl
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.
Products Associated with CVE-2026-64559
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Affected Versions
Linux:- Version 8fcc231ce3bea12b78bb94b280cdc03cff342435 and below 0a9e34ccbe772b8f321388cdbdf4f22b94e513e7 is affected.
- Version 8fcc231ce3bea12b78bb94b280cdc03cff342435 and below 693bf91d4db134f9b1c2840c8e287eee3d993bac is affected.
- Version 8fcc231ce3bea12b78bb94b280cdc03cff342435 and below 7e7e03848c918aa0acad5ffd75d929e3afec1554 is affected.
- Version 8fcc231ce3bea12b78bb94b280cdc03cff342435 and below b3d4ab2d7df9426f7f1d3671d7e2108f2ca6e970 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.