CVE-2026-89717

zram: set default primary compressor in zram_destroy_comps()

State: Published
Severity: Not scored
Published: Sep 11, 2026
Updated: Oct 21, 2026
Reserved: Sep 11, 2026

Description

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().

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	6e20720b12299595154857fa98222729f0d5823c to before a5fda7def04d98ab7c5cbb2394714fb1f8c56cb5Affected 486fd58af7ac1098b68370b1d4d9f94a2a1c7124 to before 4bf3328eeec9afc2a55632ff47fc18101ea62d73Affected 486fd58af7ac1098b68370b1d4d9f94a2a1c7124 to before 5cec3e60e9f2d1324179df3aa91656f90095cf8fAffected 486fd58af7ac1098b68370b1d4d9f94a2a1c7124 to before dea8f13c3dfad8b990f8ea96c997aabeebbc1d22Affected 486fd58af7ac1098b68370b1d4d9f94a2a1c7124 to before dde75313eed0b014c437f48dd75c0308b592cbf9Affected c4e5683c3031a33dc46954e99d37cbd2f706cdb6Affected 6.6.57 to before 6.6.160Affected 6.11.4 to before 6.12Affected
LinuxLinux	6.12Affected before 6.12Not affected 6.6.160 through 6.6.Not affected 6.12.111 through 6.12.Not affected 6.18.51 through 6.18.Not affected 7.2.4 through 7.2.Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

6e20720b12299595154857fa98222729f0d5823c to before a5fda7def04d98ab7c5cbb2394714fb1f8c56cb5Affected
486fd58af7ac1098b68370b1d4d9f94a2a1c7124 to before 4bf3328eeec9afc2a55632ff47fc18101ea62d73Affected
486fd58af7ac1098b68370b1d4d9f94a2a1c7124 to before 5cec3e60e9f2d1324179df3aa91656f90095cf8fAffected
486fd58af7ac1098b68370b1d4d9f94a2a1c7124 to before dea8f13c3dfad8b990f8ea96c997aabeebbc1d22Affected
486fd58af7ac1098b68370b1d4d9f94a2a1c7124 to before dde75313eed0b014c437f48dd75c0308b592cbf9Affected
c4e5683c3031a33dc46954e99d37cbd2f706cdb6Affected
6.6.57 to before 6.6.160Affected
6.11.4 to before 6.12Affected

LinuxLinux

6.12Affected
before 6.12Not affected
6.6.160 through 6.6.*Not affected
6.12.111 through 6.12.*Not affected
6.18.51 through 6.18.*Not affected
7.2.4 through 7.2.*Not affected
7.3 and laterNot affected

References

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