CVE-2026-64559

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.

Package Linux Kernel
Published 2026-07-29
Last modified 2026-07-29
Patch available
Yes

Affected versions

Linux kernel versions 6.12 and later are affected. Fixed in 6.12.97, 6.18.40, 7.1.5, 7.2-rc1 and their respective stable series.

Affected from
≥ 6.12
Fixed in
✓ 6.12.97 6.12.x ✓ 6.18.40 6.18.x ✓ 7.1.5 7.1.x ✓ 7.2-rc1

References

4 total

Frequently asked questions

  • What is CVE-2026-64559?

    CVE-2026-64559 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.12 onward and has been patched in 6.12.97, 6.18.40, 7.1.5 and others. CVE-2026-64559 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • Is there a patch available for CVE-2026-64559?

    Yes. CVE-2026-64559 has been patched. Fixed versions include 6.12.97, 6.18.40, 7.1.5 and others. If you are running Linux kernel 6.12 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2026-64559 actively exploited?

    No. CVE-2026-64559 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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