CVE-2026-89717 (GCVE-0-2026-89717)
Vulnerability from cvelistv5
Published
2026-09-11 19:46
Modified
2026-10-21 12:48
Severity ?
Summary
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().
References
Impacted products
Vendor Product Version
Linux Linux Version: 6e20720b12299595154857fa98222729f0d5823c
Version: 486fd58af7ac1098b68370b1d4d9f94a2a1c7124
Version: 486fd58af7ac1098b68370b1d4d9f94a2a1c7124
Version: 486fd58af7ac1098b68370b1d4d9f94a2a1c7124
Version: 486fd58af7ac1098b68370b1d4d9f94a2a1c7124
Version: c4e5683c3031a33dc46954e99d37cbd2f706cdb6
Version: 6.6.57   ≤
Version: 6.11.4   ≤
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{
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      "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()-\u003estrcmp() can be called on a NULL compressor.  Set\ndefault primary compressor in zram_destroy_comps()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:48:28.119Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/a5fda7def04d98ab7c5cbb2394714fb1f8c56cb5"
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        },
        {
          "url": "https://git.kernel.org/stable/c/dde75313eed0b014c437f48dd75c0308b592cbf9"
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      "title": "zram: set default primary compressor in zram_destroy_comps()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89717",
    "datePublished": "2026-09-11T19:46:30.698Z",
    "dateReserved": "2026-09-11T19:38:34.752Z",
    "dateUpdated": "2026-10-21T12:48:28.119Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}


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