{"id":"CVE-2026-89717","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nzram: set default primary compressor in zram_destroy_comps()\n\nPatch series \"zram: fix zram issues reported by sashiko\".\n\nSashiko drove by and reported [1] a couple of z…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nzram: set default primary compressor in zram_destroy_comps()\n\nPatch series \"zram: fix zram issues reported by sashiko\".\n\nSashiko drove by and reported [1] a couple of z…","severity":"medium","cvss":4.7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-476"],"vendor":"Linux","product":"Linux","affected":["Linux >= 486fd58af7ac1098b68370b1d4d9f94a2a1c7124 < 4bf3328eeec9afc2a55632ff47fc18101ea62d73","Linux >= 486fd58af7ac1098b68370b1d4d9f94a2a1c7124 < 5cec3e60e9f2d1324179df3aa91656f90095cf8f","Linux >= 486fd58af7ac1098b68370b1d4d9f94a2a1c7124 < dea8f13c3dfad8b990f8ea96c997aabeebbc1d22","Linux >= 486fd58af7ac1098b68370b1d4d9f94a2a1c7124 < dde75313eed0b014c437f48dd75c0308b592cbf9","Linux 6e20720b12299595154857fa98222729f0d5823c","Linux c4e5683c3031a33dc46954e99d37cbd2f706cdb6","Linux >= 6.6.57 < 6.7","Linux >= 6.11.4 < 6.12","Linux 6.12"],"published":"2026-09-11","updated":"2026-09-21","sourceUpdated":"2026-09-21T14:17:25.850","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89717","references":[{"url":"https://git.kernel.org/stable/c/4bf3328eeec9afc2a55632ff47fc18101ea62d73","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5cec3e60e9f2d1324179df3aa91656f90095cf8f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/dde75313eed0b014c437f48dd75c0308b592cbf9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/dea8f13c3dfad8b990f8ea96c997aabeebbc1d22","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89717.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89717"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532278"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89717"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89717"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89717.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00168,"epssPercentile":0.06448,"cvssSource":"vendor","ingestedAt":"2026-09-14T11:11:19.885Z","slug":"CVE-2026-89717","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nzram: set default primary compressor in zram_destroy_comps()\n\nPatch series \"zram: fix zram issues reported by sashiko\".\n\nSashiko drove by and reported [1] a couple of zram issues:\na possible BUG_ON() in zlib code due to missing winbits range\nvalidation and one possible NULL-ptr dereference in zcomp.\nBoth are low risk yet still worth fixing.\n\n\nThis patch (of 2):\n\nzram_destroy_comps() resets all compressors and leaves them set to NULL,\nincluding the primary one, which is invalid device state, as now\ncomp_algorithm_show()->strcmp() can be called on a NULL compressor.  Set\ndefault primary compressor in zram_destroy_comps().\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89717.json)","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":25.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":204025,"id":"CVE-2026-89717","ts":1789490231098,"field":"cvss","old":null,"new":"4.7"},{"seq":204024,"id":"CVE-2026-89717","ts":1789490231098,"field":"severity","old":"none","new":"medium"},{"seq":147440,"id":"CVE-2026-89717","ts":1789270210917,"field":"cvss","old":null,"new":"4.7"},{"seq":147439,"id":"CVE-2026-89717","ts":1789270210917,"field":"severity","old":"none","new":"medium"},{"seq":109194,"id":"CVE-2026-89717","ts":1789183730678,"field":"cvss","old":null,"new":"4.7"},{"seq":109193,"id":"CVE-2026-89717","ts":1789183730678,"field":"severity","old":"none","new":"medium"}]}