fuse: fix invalidate lock leak on open O_TRUNC DAX failure
Summary
| CVE | CVE-2026-80855 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-04 16:18:14 UTC |
| Updated | 2026-09-04 16:18:14 UTC |
| Description | 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. |
Risk And Classification
EPSS: 0.001650000 probability, percentile 0.059530000 (date 2026-09-07)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected d58366aab86854217b81679d1a9dcd54a2edfc2a 1b04d80a27d317064cce2307472f5bef9975bc50 git | Not specified |
| CNA | Linux | Linux | affected 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b a61524da59a2f5ac9c8de23ff98b30da769ab144 git | Not specified |
| CNA | Linux | Linux | affected 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b dcf30a56624c2a0cfab1bada5b1ca8cc0c02f010 git | Not specified |
| CNA | Linux | Linux | affected 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b 7288c279ddbd654a06c82118c1a3f5570c1807f0 git | Not specified |
| CNA | Linux | Linux | affected 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b 776e85fda752f9a15e0f82dec42ecacd12a9bd94 git | Not specified |
| CNA | Linux | Linux | affected 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b 1d3e701cda2f41d48aa721b3ebefbe0fbf8d74da git | Not specified |
| CNA | Linux | Linux | affected 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b e981474d7bf1457da12404e169ea147d2c8ecea7 git | Not specified |
| CNA | Linux | Linux | affected 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b a927f1867e61b78f39f9da0bbba3c98c2ca151fe git | Not specified |
| CNA | Linux | Linux | affected 81775ab858b4236c52c5da7e25cec6e49dd91b46 git | Not specified |
| CNA | Linux | Linux | affected b57e150ac2eac791d5d187923b73dc2dafaf67fa git | Not specified |
| CNA | Linux | Linux | affected 1fdbbe246daf348adaa0739463384b16ceba1fc0 git | Not specified |
| CNA | Linux | Linux | affected 5.15.109 5.15.220 semver | Not specified |
| CNA | Linux | Linux | affected 5.10.179 5.11 semver | Not specified |
| CNA | Linux | Linux | affected 5.18.18 5.19 semver | Not specified |
| CNA | Linux | Linux | affected 5.19.2 5.20 semver | Not specified |
| CNA | Linux | Linux | affected 6.0 | Not specified |
| CNA | Linux | Linux | unaffected 6.0 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.220 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.187 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.156 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.108 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.49 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.13 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2.3 7.2.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.3-rc1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/dcf30a56624c2a0cfab1bada5b1ca8cc0c02f010 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/7288c279ddbd654a06c82118c1a3f5570c1807f0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a927f1867e61b78f39f9da0bbba3c98c2ca151fe | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e981474d7bf1457da12404e169ea147d2c8ecea7 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/1d3e701cda2f41d48aa721b3ebefbe0fbf8d74da | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/776e85fda752f9a15e0f82dec42ecacd12a9bd94 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/1b04d80a27d317064cce2307472f5bef9975bc50 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a61524da59a2f5ac9c8de23ff98b30da769ab144 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.