GHSA-5X8P-2X56-54GV

Vulnerability from github – Published: 2026-09-04 18:31 – Updated: 2026-09-04 18:31
VLAI
Details

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

ocfs2: fix buffer head management in ocfs2_read_blocks()

In ocfs2_read_blocks(), caller should't assume that buffer head returned by 'sb_getblk()' is exclusively owned and so 'put_bh()' always drops b_count from 1 to 0. If it is not so, buffer head remains on hold and likely to be returned by the next call to 'sb_getblk()' unchanged - that is, with BH_Uptodate bit set even if it has failed validation previously, thus allowing to insert that buffer head into OCFS2 metadata cache and submit it to upper layers. To avoid such a scenario, BH_Uptodate should be cleared immediately after 'validate()' callback has detected some data inconsistency.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80881"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-04T17:17:00Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix buffer head management in ocfs2_read_blocks()\n\nIn ocfs2_read_blocks(), caller should\u0027t assume that buffer head returned\nby \u0027sb_getblk()\u0027 is exclusively owned and so \u0027put_bh()\u0027 always drops\nb_count from 1 to 0.  If it is not so, buffer head remains on hold and\nlikely to be returned by the next call to \u0027sb_getblk()\u0027 unchanged - that\nis, with BH_Uptodate bit set even if it has failed validation previously,\nthus allowing to insert that buffer head into OCFS2 metadata cache and\nsubmit it to upper layers.  To avoid such a scenario, BH_Uptodate should\nbe cleared immediately after \u0027validate()\u0027 callback has detected some data\ninconsistency.",
  "id": "GHSA-5x8p-2x56-54gv",
  "modified": "2026-09-04T18:31:32Z",
  "published": "2026-09-04T18:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80881"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0e389fc290c350c67591abf4c367119f4689f310"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4ab17e328522a4df5fe0f0dcf39098118b1feeaa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5927acb3e2c99985a14adecd9d1b67ba191c622d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/61f7a5acb3bf8fc97dad78f54b1e8d0e1c819766"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6371a07148ee979af22a9d6f4c277462953a9a4a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9e7a057934cdd58e4cc94350bcfe5367bbee0f8e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a4eae1499c760949a93459d11390bd1fd823d31d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ecb3f9386f4353034caef77239473c627232db17"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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