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Squashfs: check block offset is not negative

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: Squashfs: check block offset is not negative If a negative offset is read off disk (for example the offset into the decompressed fragment block), this will cause squashfs_copy_data() to perform an out of bounds access. Fix by checking if offset is negative, and returning 0. This matches existing behaviour where an offset beyond the block returns 0 bytes copied. To trigger this out of bounds access requires a crafted Squashfs filesystem and CAP_SYS_ADMIN to mount it. Unprivileged users will not be able to mount such a filesystem, but once mounted, an unprivileged user can trigger the out of bounds access by reading the crafted file with the negative offset.

Announced Source revision 1
Original source ↗

CVE-2026-90203

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-90203

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "f400e12656ab518be107febfe2315fb1eab5a342",
        "lessThan": "b169185d5c672b989985c6c2e38cafab2548ba88",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f400e12656ab518be107febfe2315fb1eab5a342",
        "lessThan": "c2a126fca820ae74872da28de68dc74d4595dc4b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f400e12656ab518be107febfe2315fb1eab5a342",
        "lessThan": "95dadf366c117dcdca78a570e6832071deab1ecd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f400e12656ab518be107febfe2315fb1eab5a342",
        "lessThan": "3d2f0cb66c909ea2312cdef465165bb9a3ba2d84",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f400e12656ab518be107febfe2315fb1eab5a342",
        "lessThan": "bbb2218eb072b0a15dc063929200183bd23c2344",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f400e12656ab518be107febfe2315fb1eab5a342",
        "lessThan": "d0a3729d464fcf516416a41cf304c0c92126ee03",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f400e12656ab518be107febfe2315fb1eab5a342",
        "lessThan": "e4afd90bc7bf3dd477970c6c42bdd29ad3fda7fe",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f400e12656ab518be107febfe2315fb1eab5a342",
        "lessThan": "e300eb5002925b29be803d2661af07266cfa267e",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/squashfs/cache.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.29"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.29",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/squashfs/cache.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90203

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#36581 · Revision 1
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Publisher date
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