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CVE-2026-80856 (GCVE-0-2026-80856)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:55 – Updated: 2026-09-04 15:55
VLAI
Title
fuse: fix invalidate lock leak on setattr writeback failure
Summary
In the Linux kernel, the following vulnerability has been resolved: fuse: fix invalidate lock leak on setattr writeback failure fuse_do_setattr() takes filemap_invalidate_lock() for a DAX truncate (fault_blocked = true) and releases it at the out:/error: labels. But when a writeback flush is also needed, a write_inode_now() failure returns directly and leaks the lock, so any later fault or truncate on the file stalls on the stale rwsem. For example, truncate(2) on a setuid file reaches fuse_do_setattr() with both ATTR_SIZE and ATTR_MODE set: truncate(2) └─ do_truncate() ├─ dentry_needs_remove_privs() # S_ISUID └─ notify_change() # KILL_SUID -> ATTR_MODE └─ fuse_setattr() # no killpriv: │ # ia_valid |= ATTR_MODE └─ fuse_do_setattr() ├─ filemap_invalidate_lock() # IS_DAX && is_truncate └─ write_inode_now() # is_wb && ATTR_MODE └─ if (err) # e.g. daemon -> -EIO return err # <- lock leaked Fix this by adding an unlock label that releases the lock before returning the error, and use it for the fuse_dax_break_layouts() failure path as well.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f , < 8f14906ce9103ab8f2f1ebda45935a0d61b9d763 (git)
Affected: 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f , < 03cfeeb135428fa83f0791d3f8f94d9298cae695 (git)
Affected: 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f , < 92588d187ba4697a322e7aefe5d9e538a87d1cd2 (git)
Affected: 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f , < ea9fea370b8de4ffd72e0ef89550415c15637787 (git)
Affected: 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f , < 1758730d9eaa3c06cf415c3446d9f6eed9ed3eed (git)
Affected: 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f , < dd278d954c0e96a9cbd3cc491e07b8267d25f8d5 (git)
Affected: 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f , < e8457ebfd77a46e8d1210e8888ea914ad064558e (git)
Affected: 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f , < 9afeca0d569c9fc89d758fe7a9339d1e8afb1546 (git)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.15.220 , ≤ 5.15.* (semver)
Unaffected: 6.1.187 , ≤ 6.1.* (semver)
Unaffected: 6.6.156 , ≤ 6.6.* (semver)
Unaffected: 6.12.108 , ≤ 6.12.* (semver)
Unaffected: 6.18.49 , ≤ 6.18.* (semver)
Unaffected: 7.1.13 , ≤ 7.1.* (semver)
Unaffected: 7.2.3 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: fix invalidate lock leak on setattr writeback failure\n\nfuse_do_setattr() takes filemap_invalidate_lock() for a DAX truncate\n(fault_blocked = true) and releases it at the out:/error: labels.  But\nwhen a writeback flush is also needed, a write_inode_now() failure\nreturns directly and leaks the lock, so any later fault or truncate on\nthe file stalls on the stale rwsem.\n\nFor example, truncate(2) on a setuid file reaches fuse_do_setattr()\nwith both ATTR_SIZE and ATTR_MODE set:\n\n  truncate(2)\n  \u2514\u2500 do_truncate()\n     \u251c\u2500 dentry_needs_remove_privs()         # S_ISUID\n     \u2514\u2500 notify_change()                     # KILL_SUID -\u003e ATTR_MODE\n        \u2514\u2500 fuse_setattr()                   # no killpriv:\n           \u2502                                #   ia_valid |= ATTR_MODE\n           \u2514\u2500 fuse_do_setattr()\n              \u251c\u2500 filemap_invalidate_lock()  # IS_DAX \u0026\u0026 is_truncate\n              \u2514\u2500 write_inode_now()          # is_wb \u0026\u0026 ATTR_MODE\n                 \u2514\u2500 if (err)                # e.g. daemon -\u003e -EIO\n                    return err              # \u003c- lock leaked\n\nFix this by adding an unlock label that releases the lock before\nreturning the error, and use it for the fuse_dax_break_layouts()\nfailure path as well."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T15:55:09.250Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/9afeca0d569c9fc89d758fe7a9339d1e8afb1546"
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      "title": "fuse: fix invalidate lock leak on setattr writeback failure",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80856",
    "datePublished": "2026-09-04T15:55:09.250Z",
    "dateReserved": "2026-08-26T14:34:25.797Z",
    "dateUpdated": "2026-09-04T15:55:09.250Z",
    "state": "PUBLISHED"
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      "date": "2026-09-15",
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      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80856.json",
      "version": "2"
    },
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But\\nwhen a writeback flush is also needed, a write_inode_now() failure\\nreturns directly and leaks the lock, so any later fault or truncate on\\nthe file stalls on the stale rwsem.\\n\\nFor example, truncate(2) on a setuid file reaches fuse_do_setattr()\\nwith both ATTR_SIZE and ATTR_MODE set:\\n\\n  truncate(2)\\n  \u2514\u2500 do_truncate()\\n     \u251c\u2500 dentry_needs_remove_privs()         # S_ISUID\\n     \u2514\u2500 notify_change()                     # KILL_SUID -\u003e ATTR_MODE\\n        \u2514\u2500 fuse_setattr()                   # no killpriv:\\n           \u2502                                #   ia_valid |= ATTR_MODE\\n           \u2514\u2500 fuse_do_setattr()\\n              \u251c\u2500 filemap_invalidate_lock()  # IS_DAX \u0026\u0026 is_truncate\\n              \u2514\u2500 write_inode_now()          # is_wb \u0026\u0026 ATTR_MODE\\n                 \u2514\u2500 if (err)                # e.g. daemon -\u003e -EIO\\n                    return err              # \u003c- lock leaked\\n\\nFix this by adding an unlock label that releases the lock before\\nreturning the error, and use it for the fuse_dax_break_layouts()\\nfailure path as well.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/fuse/dir.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f\",\"lessThan\":\"8f14906ce9103ab8f2f1ebda45935a0d61b9d763\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f\",\"lessThan\":\"03cfeeb135428fa83f0791d3f8f94d9298cae695\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f\",\"lessThan\":\"92588d187ba4697a322e7aefe5d9e538a87d1cd2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f\",\"lessThan\":\"ea9fea370b8de4ffd72e0ef89550415c15637787\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f\",\"lessThan\":\"1758730d9eaa3c06cf415c3446d9f6eed9ed3eed\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f\",\"lessThan\":\"dd278d954c0e96a9cbd3cc491e07b8267d25f8d5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f\",\"lessThan\":\"e8457ebfd77a46e8d1210e8888ea914ad064558e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6ae330cad6ef22ab8347ea9e0707dc56a7c7363f\",\"lessThan\":\"9afeca0d569c9fc89d758fe7a9339d1e8afb1546\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/fuse/dir.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.10\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.10\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.220\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.187\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.156\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.108\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.49\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.13\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.3\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/03cfeeb135428fa83f0791d3f8f94d9298cae695\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1758730d9eaa3c06cf415c3446d9f6eed9ed3eed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8f14906ce9103ab8f2f1ebda45935a0d61b9d763\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/92588d187ba4697a322e7aefe5d9e538a87d1cd2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9afeca0d569c9fc89d758fe7a9339d1e8afb1546\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dd278d954c0e96a9cbd3cc491e07b8267d25f8d5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e8457ebfd77a46e8d1210e8888ea914ad064558e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ea9fea370b8de4ffd72e0ef89550415c15637787\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T01:50:26Z",
      "cve": "CVE-2026-80856",
      "id": "CVE-2026-80856",
      "initial_release_date": "2026-09-05T00:26:02Z",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "143",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80856",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80856.json",
      "version": "4"
    }
  }
}



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