# CVE-2026-89717

## Summary

- **CVE ID:** CVE-2026-89717
- **Severity:** UNKNOWN
- **CVSS Score:** 1.51
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 16, 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().

## Affected Products

- Linux — Linux (486fd58af7ac1098b68370b1d4d9f94a2a1c7124)
- Linux — Linux (6e20720b12299595154857fa98222729f0d5823c)
- Linux — Linux (c4e5683c3031a33dc46954e99d37cbd2f706cdb6)
- Linux — Linux (6.6.57)
- Linux — Linux (6.11.4)
- Linux — Linux (6.12)
- Linux — Linux (0)
- Linux — Linux (6.18.51)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)

## References

- [CNA](https://git.kernel.org/stable/c/5cec3e60e9f2d1324179df3aa91656f90095cf8f)
- [CNA](https://git.kernel.org/stable/c/dea8f13c3dfad8b990f8ea96c997aabeebbc1d22)
- [CNA](https://git.kernel.org/stable/c/dde75313eed0b014c437f48dd75c0308b592cbf9)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.17%
- **EPSS Percentile:** 6.2

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._