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fuse: fix invalidate lock leak on setattr writeback failure

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-80856

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-80856

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "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"
      }
    ],
    "programFiles": [
      "fs/fuse/dir.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.10"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.10",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.220",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.187",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.156",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.108",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.49",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.13",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.3",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/fuse/dir.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-80856

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#34871 · Revision 1
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