CVE-2026-89717

In the Linux kernel, the following vulnerability has been resolved: zram: set default primary compressor in zram_destroy_comps() Patch series "zram: fix zram issues reported by sashiko". Sashiko drove by and reported [1] a couple of zram issues: a possible BUG_ON() in zlib code due to missing winbits range validation and one possible NULL-ptr dereference in zcomp. Both are low risk yet still worth fixing. This patch (of 2): zram_destroy_comps() resets all compressors and leaves them set to NULL, including the primary one, which is invalid device state, as now comp_algorithm_show()->strcmp() can be called on a NULL compressor. Set default primary compressor in zram_destroy_comps().

Package Linux Kernel
Published 2026-09-11
Last modified 2026-09-21
Patch available
Yes

Affected versions

Linux kernel versions 6.6.57, 6.11.4, 6.12 and later are affected. Fixed in 6.12.111, 6.18.51, 7.2.4, 7.3-rc1 and their respective stable series.

Affected from
≥ 6.6.57 ≥ 6.11.4 ≥ 6.12
Fixed in
✓ 6.12.111 6.12.x ✓ 6.18.51 6.18.x ✓ 7.2.4 7.2.x ✓ 7.3-rc1

References

4 total

Frequently asked questions

  • What is CVE-2026-89717?

    CVE-2026-89717 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.6.57 onward and has been patched in 6.12.111, 6.18.51, 7.2.4 and others. CVE-2026-89717 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • Is there a patch available for CVE-2026-89717?

    Yes. CVE-2026-89717 has been patched. Fixed versions include 6.12.111, 6.18.51, 7.2.4 and others. If you are running Linux kernel 6.6.57 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2026-89717 actively exploited?

    No. CVE-2026-89717 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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