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FKIE_CVE-2026-89717

Vulnerability from fkie_nvd - Published: 2026-09-11 20:19 - Updated: 2026-09-11 20:19
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5cec3e60e9f2d1324179df3aa91656f90095cf8f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dde75313eed0b014c437f48dd75c0308b592cbf9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dea8f13c3dfad8b990f8ea96c997aabeebbc1d22
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/block/zram/zram_drv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "5cec3e60e9f2d1324179df3aa91656f90095cf8f",
              "status": "affected",
              "version": "486fd58af7ac1098b68370b1d4d9f94a2a1c7124",
              "versionType": "git"
            },
            {
              "lessThan": "dea8f13c3dfad8b990f8ea96c997aabeebbc1d22",
              "status": "affected",
              "version": "486fd58af7ac1098b68370b1d4d9f94a2a1c7124",
              "versionType": "git"
            },
            {
              "lessThan": "dde75313eed0b014c437f48dd75c0308b592cbf9",
              "status": "affected",
              "version": "486fd58af7ac1098b68370b1d4d9f94a2a1c7124",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6e20720b12299595154857fa98222729f0d5823c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c4e5683c3031a33dc46954e99d37cbd2f706cdb6",
              "versionType": "git"
            },
            {
              "lessThan": "6.7",
              "status": "affected",
              "version": "6.6.57",
              "versionType": "semver"
            },
            {
              "lessThan": "6.12",
              "status": "affected",
              "version": "6.11.4",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/block/zram/zram_drv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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()."
    }
  ],
  "id": "CVE-2026-89717",
  "lastModified": "2026-09-11T20:19:59.233",
  "metrics": {},
  "published": "2026-09-11T20:19:59.233",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5cec3e60e9f2d1324179df3aa91656f90095cf8f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dde75313eed0b014c437f48dd75c0308b592cbf9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dea8f13c3dfad8b990f8ea96c997aabeebbc1d22"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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