CVE-2026-89717
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().
How to fix
- Linux Linuxa5fda7def04d98ab7c5cbb2394714fb1f8c56cb5, 4bf3328eeec9afc2a55632ff47fc18101ea62d73, 5cec3e60e9f2d1324179df3aa91656f90095cf8f, dea8f13c3dfad8b990f8ea96c997aabeebbc1d22, dde75313eed0b014c437f48dd75c0308b592cbf9, 6.6.160, 6.12 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 6e20720b12299595154857fa98222729f0d5823c ≤ v < a5fda7def04d98ab7c5cbb2394714fb1f8c56cb5, 486fd58af7ac1098b68370b1d4d9f94a2a1c7124 ≤ v < 4bf3328eeec9afc2a55632ff47fc18101ea62d73, 486fd58af7ac1098b68370b1d4d9f94a2a1c7124 ≤ v < 5cec3e60e9f2d1324179df3aa91656f90095cf8f, 486fd58af7ac1098b68370b1d4d9f94a2a1c7124 ≤ v < dea8f13c3dfad8b990f8ea96c997aabeebbc1d22, 486fd58af7ac1098b68370b1d4d9f94a2a1c7124 ≤ v < dde75313eed0b014c437f48dd75c0308b592cbf9, c4e5683c3031a33dc46954e99d37cbd2f706cdb6, 6.6.57 ≤ v < 6.6.160, 6.11.4 ≤ v < 6.12, 6.12 | a5fda7def04d98ab7c5cbb2394714fb1f8c56cb5, 4bf3328eeec9afc2a55632ff47fc18101ea62d73, 5cec3e60e9f2d1324179df3aa91656f90095cf8f, dea8f13c3dfad8b990f8ea96c997aabeebbc1d22, dde75313eed0b014c437f48dd75c0308b592cbf9, 6.6.160, 6.12 |
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