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CVE-2026-80855 (GCVE-0-2026-80855)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:55 – Updated: 2026-09-04 15:55
VLAI
Title
fuse: fix invalidate lock leak on open O_TRUNC DAX failure
Summary
In the Linux kernel, the following vulnerability has been resolved: fuse: fix invalidate lock leak on open O_TRUNC DAX failure fuse_open() takes filemap_invalidate_lock() for a DAX truncate (dax_truncate = true) and releases it before the out_inode_unlock label. But when fuse_dax_break_layouts() fails, the goto out_inode_unlock skips the unlock and leaks the rwsem, so any later fault or truncate on the file stalls on the stale lock. fuse_dax_break_layouts() can fail with -ERESTARTSYS when a signal interrupts the wait for busy DAX pages to drain: open("file", O_RDWR | O_TRUNC) └─ fuse_open() ├─ filemap_invalidate_lock() # dax_truncate └─ fuse_dax_break_layouts() └─ dax_break_layout() └─ wait_page_idle() # TASK_INTERRUPTIBLE └─ fuse_wait_dax_page() # unlock, schedule, re-lock └─ signal → -ERESTARTSYS goto out_inode_unlock # <- lock leaked Fix this by moving filemap_invalidate_unlock() below the label so that all error paths release the lock, and rename the label to out_unlock as it now covers more than just the inode lock.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d58366aab86854217b81679d1a9dcd54a2edfc2a , < 1b04d80a27d317064cce2307472f5bef9975bc50 (git)
Affected: 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b , < a61524da59a2f5ac9c8de23ff98b30da769ab144 (git)
Affected: 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b , < dcf30a56624c2a0cfab1bada5b1ca8cc0c02f010 (git)
Affected: 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b , < 7288c279ddbd654a06c82118c1a3f5570c1807f0 (git)
Affected: 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b , < 776e85fda752f9a15e0f82dec42ecacd12a9bd94 (git)
Affected: 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b , < 1d3e701cda2f41d48aa721b3ebefbe0fbf8d74da (git)
Affected: 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b , < e981474d7bf1457da12404e169ea147d2c8ecea7 (git)
Affected: 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b , < a927f1867e61b78f39f9da0bbba3c98c2ca151fe (git)
Affected: 81775ab858b4236c52c5da7e25cec6e49dd91b46 (git)
Affected: b57e150ac2eac791d5d187923b73dc2dafaf67fa (git)
Affected: 1fdbbe246daf348adaa0739463384b16ceba1fc0 (git)
Affected: 5.15.109 , < 5.15.220 (semver)
Affected: 5.10.179 , < 5.11 (semver)
Affected: 5.18.18 , < 5.19 (semver)
Affected: 5.19.2 , < 5.20 (semver)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (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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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: fix invalidate lock leak on open O_TRUNC DAX failure\n\nfuse_open() takes filemap_invalidate_lock() for a DAX truncate\n(dax_truncate = true) and releases it before the out_inode_unlock\nlabel.  But when fuse_dax_break_layouts() fails, the goto\nout_inode_unlock skips the unlock and leaks the rwsem, so any later\nfault or truncate on the file stalls on the stale lock.\n\nfuse_dax_break_layouts() can fail with -ERESTARTSYS when a signal\ninterrupts the wait for busy DAX pages to drain:\n\n  open(\"file\", O_RDWR | O_TRUNC)\n  \u2514\u2500 fuse_open()\n     \u251c\u2500 filemap_invalidate_lock()        # dax_truncate\n     \u2514\u2500 fuse_dax_break_layouts()\n        \u2514\u2500 dax_break_layout()\n           \u2514\u2500 wait_page_idle()           # TASK_INTERRUPTIBLE\n              \u2514\u2500 fuse_wait_dax_page()    # unlock, schedule, re-lock\n                 \u2514\u2500 signal \u2192 -ERESTARTSYS\n     goto out_inode_unlock               # \u003c- lock leaked\n\nFix this by moving filemap_invalidate_unlock() below the label so\nthat all error paths release the lock, and rename the label to\nout_unlock as it now covers more than just the inode lock."
        }
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    "datePublished": "2026-09-04T15:55:07.864Z",
    "dateReserved": "2026-08-26T14:34:25.797Z",
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      "product_status:under_investigation": "1",
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      "title": "fuse: fix invalidate lock leak on open O_TRUNC DAX failure",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80855.json",
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: fix invalidate lock leak on open O_TRUNC DAX failure\n\nfuse_open() takes filemap_invalidate_lock() for a DAX truncate\n(dax_truncate = true) and releases it before the out_inode_unlock\nlabel.  But when fuse_dax_break_layouts() fails, the goto\nout_inode_unlock skips the unlock and leaks the rwsem, so any later\nfault or truncate on the file stalls on the stale lock.\n\nfuse_dax_break_layouts() can fail with -ERESTARTSYS when a signal\ninterrupts the wait for busy DAX pages to drain:\n\n  open(\"file\", O_RDWR | O_TRUNC)\n  \u2514\u2500 fuse_open()\n     \u251c\u2500 filemap_invalidate_lock()        # dax_truncate\n     \u2514\u2500 fuse_dax_break_layouts()\n        \u2514\u2500 dax_break_layout()\n           \u2514\u2500 wait_page_idle()           # TASK_INTERRUPTIBLE\n              \u2514\u2500 fuse_wait_dax_page()    # unlock, schedule, re-lock\n                 \u2514\u2500 signal \u2192 -ERESTARTSYS\n     goto out_inode_unlock               # \u003c- lock leaked\n\nFix this by moving filemap_invalidate_unlock() below the label so\nthat all error paths release the lock, and rename the label to\nout_unlock as it now covers more than just the inode lock."
          }
        ],
        "id": "CVE-2026-80855",
        "lastModified": "2026-09-04T16:18:14.507",
        "metrics": {},
        "published": "2026-09-04T16:18:14.507",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1b04d80a27d317064cce2307472f5bef9975bc50"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1d3e701cda2f41d48aa721b3ebefbe0fbf8d74da"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7288c279ddbd654a06c82118c1a3f5570c1807f0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/776e85fda752f9a15e0f82dec42ecacd12a9bd94"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a61524da59a2f5ac9c8de23ff98b30da769ab144"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a927f1867e61b78f39f9da0bbba3c98c2ca151fe"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/dcf30a56624c2a0cfab1bada5b1ca8cc0c02f010"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e981474d7bf1457da12404e169ea147d2c8ecea7"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:07:11Z",
      "cve": "CVE-2026-80855",
      "id": "CVE-2026-80855",
      "initial_release_date": "2026-09-05T00:26:04Z",
      "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-2026-80855",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80855.json",
      "version": "6"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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.