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().

EPSS

0.2% chance of exploitation in the next 30 days; higher than 6% of CVEs (scores of 2026-10-25)

Published

2026-09-11

Modified

2026-10-21

Record from

the NVD, synced 2026-10-22

References

• https://git.kernel.org/stable/c/4bf3328eeec9afc2a55632ff47fc18101ea62d73
• https://git.kernel.org/stable/c/5cec3e60e9f2d1324179df3aa91656f90095cf8f
• https://git.kernel.org/stable/c/a5fda7def04d98ab7c5cbb2394714fb1f8c56cb5
• https://git.kernel.org/stable/c/dde75313eed0b014c437f48dd75c0308b592cbf9
• https://git.kernel.org/stable/c/dea8f13c3dfad8b990f8ea96c997aabeebbc1d22

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