{"id":"CVE-2026-89717","state":"PUBLISHED","title":"zram: set default primary compressor in zram_destroy_comps()","description":"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 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().","publishedAt":"2026-09-11T19:46:30.698Z","updatedAt":"2026-10-21T12:48:28.119Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6e20720b12299595154857fa98222729f0d5823c","status":"affected","lessThan":"a5fda7def04d98ab7c5cbb2394714fb1f8c56cb5","versionType":"git"},{"version":"486fd58af7ac1098b68370b1d4d9f94a2a1c7124","status":"affected","lessThan":"4bf3328eeec9afc2a55632ff47fc18101ea62d73","versionType":"git"},{"version":"486fd58af7ac1098b68370b1d4d9f94a2a1c7124","status":"affected","lessThan":"5cec3e60e9f2d1324179df3aa91656f90095cf8f","versionType":"git"},{"version":"486fd58af7ac1098b68370b1d4d9f94a2a1c7124","status":"affected","lessThan":"dea8f13c3dfad8b990f8ea96c997aabeebbc1d22","versionType":"git"},{"version":"486fd58af7ac1098b68370b1d4d9f94a2a1c7124","status":"affected","lessThan":"dde75313eed0b014c437f48dd75c0308b592cbf9","versionType":"git"},{"version":"c4e5683c3031a33dc46954e99d37cbd2f706cdb6","status":"affected","versionType":"git"},{"version":"6.6.57","status":"affected","lessThan":"6.6.160","versionType":"semver"},{"version":"6.11.4","status":"affected","lessThan":"6.12","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/zram/zram_drv.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.12","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/zram/zram_drv.c"]}],"references":["https://git.kernel.org/stable/c/a5fda7def04d98ab7c5cbb2394714fb1f8c56cb5","https://git.kernel.org/stable/c/4bf3328eeec9afc2a55632ff47fc18101ea62d73","https://git.kernel.org/stable/c/5cec3e60e9f2d1324179df3aa91656f90095cf8f","https://git.kernel.org/stable/c/dea8f13c3dfad8b990f8ea96c997aabeebbc1d22","https://git.kernel.org/stable/c/dde75313eed0b014c437f48dd75c0308b592cbf9"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89717.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89717","state":"PUBLISHED","datePublished":"2026-09-11T19:46:30.698Z","dateUpdated":"2026-10-21T12:48:28.119Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.752Z"},"containers":{"cna":{"title":"zram: set default primary compressor in zram_destroy_comps()","descriptions":[{"lang":"en","value":"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 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()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6e20720b12299595154857fa98222729f0d5823c","status":"affected","lessThan":"a5fda7def04d98ab7c5cbb2394714fb1f8c56cb5","versionType":"git"},{"version":"486fd58af7ac1098b68370b1d4d9f94a2a1c7124","status":"affected","lessThan":"4bf3328eeec9afc2a55632ff47fc18101ea62d73","versionType":"git"},{"version":"486fd58af7ac1098b68370b1d4d9f94a2a1c7124","status":"affected","lessThan":"5cec3e60e9f2d1324179df3aa91656f90095cf8f","versionType":"git"},{"version":"486fd58af7ac1098b68370b1d4d9f94a2a1c7124","status":"affected","lessThan":"dea8f13c3dfad8b990f8ea96c997aabeebbc1d22","versionType":"git"},{"version":"486fd58af7ac1098b68370b1d4d9f94a2a1c7124","status":"affected","lessThan":"dde75313eed0b014c437f48dd75c0308b592cbf9","versionType":"git"},{"version":"c4e5683c3031a33dc46954e99d37cbd2f706cdb6","status":"affected","versionType":"git"},{"version":"6.6.57","status":"affected","lessThan":"6.6.160","versionType":"semver"},{"version":"6.11.4","status":"affected","lessThan":"6.12","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/zram/zram_drv.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.12","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/zram/zram_drv.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/a5fda7def04d98ab7c5cbb2394714fb1f8c56cb5"},{"url":"https://git.kernel.org/stable/c/4bf3328eeec9afc2a55632ff47fc18101ea62d73"},{"url":"https://git.kernel.org/stable/c/5cec3e60e9f2d1324179df3aa91656f90095cf8f"},{"url":"https://git.kernel.org/stable/c/dea8f13c3dfad8b990f8ea96c997aabeebbc1d22"},{"url":"https://git.kernel.org/stable/c/dde75313eed0b014c437f48dd75c0308b592cbf9"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-21T12:48:28.119Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.57","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.18.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11.4"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}