---
cve: "CVE-2026-89717"
severity: "LOW"
cvss: 3.1
epss: "5.2%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-09-11 20:19:59"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-16T23:26:15+02:00"
---

# CVE-2026-89717

> 3.1 LOW

## Beschreibung

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().

## Patch verfügbar (OSV)

- Kernel ≥ 6.18.51
- Kernel ≥ 7.2.4

## Referenzen

- <https://git.kernel.org/stable/c/5cec3e60e9f2d1324179df3aa91656f90095cf8f>
- <https://git.kernel.org/stable/c/dde75313eed0b014c437f48dd75c0308b592cbf9>
- <https://git.kernel.org/stable/c/dea8f13c3dfad8b990f8ea96c997aabeebbc1d22>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-89717) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_