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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)
guessed Create a notification for this product.
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          "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."
        }
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      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "datePublished": "2026-09-04T15:55:09.250Z",
    "dateReserved": "2026-08-26T14:34:25.797Z",
    "dateUpdated": "2026-09-04T15:55:09.250Z",
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            "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."
          }
        ],
        "id": "CVE-2026-80856",
        "lastModified": "2026-09-04T16:18:14.660",
        "metrics": {},
        "published": "2026-09-04T16:18:14.660",
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          },
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          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:07:09Z",
      "cve": "CVE-2026-80856",
      "id": "CVE-2026-80856",
      "initial_release_date": "2026-09-05T00:26:02Z",
      "product_status:known_affected": "210",
      "product_status:known_not_affected": "143",
      "product_status:recommended": "4",
      "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": "5"
    }
  }
}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.