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CVE-2026-90259

Status: ReceivedUnscored—

In the Linux kernel, the following vulnerability has been resolved:

btrfs: qgroup: fix a wrong length calculation in qgroup_free_reserved_data()

In that function, we round down the start position and round up the ending position.

But during the calculation of @len, we use "round_up(start + len, sectorsize)", which is the rounded up end position, not the rounded up length.

Which results a much larger length, and later we are still using "start + len", which is completely incorrect.

Fix it by declaring a local @aligned_start and @aligned_len and use them instead.

CVSS

NVD hasn't assigned a CVSS score to this CVE (common since the April 2026 policy change).

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Linux — Linux KernelAI

References

Raw JSON (NVD)

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{
  "id": "CVE-2026-90259",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "bc42bda22345efdb5d8b578d1b4df2c6eaa85c58",
              "lessThan": "e6edde29990af8064b9d12217ec03db231ccd55d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "bc42bda22345efdb5d8b578d1b4df2c6eaa85c58",
              "lessThan": "c4c136555ff90f1e2921cc42da43daac0ef9985e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "bc42bda22345efdb5d8b578d1b4df2c6eaa85c58",
              "lessThan": "9102b179512e11644fb0489ae62010a09afa199c",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/btrfs/qgroup.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.13"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.13",
              "versionType": "semver"
            },
            {
              "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-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/btrfs/qgroup.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-17T17:17:22.330",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/9102b179512e11644fb0489ae62010a09afa199c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c4c136555ff90f1e2921cc42da43daac0ef9985e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e6edde29990af8064b9d12217ec03db231ccd55d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: qgroup: fix a wrong length calculation in qgroup_free_reserved_data()\n\nIn that function, we round down the start position and round up the\nending position.\n\nBut during the calculation of @len, we use \"round_up(start + len,\nsectorsize)\", which is the rounded up end position, not the rounded up\nlength.\n\nWhich results a much larger length, and later we are still using\n\"start + len\", which is completely incorrect.\n\nFix it by declaring a local @aligned_start and @aligned_len and use them\ninstead."
    }
  ],
  "lastModified": "2026-09-17T17:17:22.330",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}