fuse: fix invalidate lock leak on setattr writeback failure
Summary
| CVE | CVE-2026-80856 |
|---|---|
| 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 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. |
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 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f 8f14906ce9103ab8f2f1ebda45935a0d61b9d763 git | Not specified |
| CNA | Linux | Linux | affected 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f 03cfeeb135428fa83f0791d3f8f94d9298cae695 git | Not specified |
| CNA | Linux | Linux | affected 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f 92588d187ba4697a322e7aefe5d9e538a87d1cd2 git | Not specified |
| CNA | Linux | Linux | affected 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f ea9fea370b8de4ffd72e0ef89550415c15637787 git | Not specified |
| CNA | Linux | Linux | affected 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f 1758730d9eaa3c06cf415c3446d9f6eed9ed3eed git | Not specified |
| CNA | Linux | Linux | affected 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f dd278d954c0e96a9cbd3cc491e07b8267d25f8d5 git | Not specified |
| CNA | Linux | Linux | affected 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f e8457ebfd77a46e8d1210e8888ea914ad064558e git | Not specified |
| CNA | Linux | Linux | affected 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f 9afeca0d569c9fc89d758fe7a9339d1e8afb1546 git | Not specified |
| CNA | Linux | Linux | affected 5.10 | Not specified |
| CNA | Linux | Linux | unaffected 5.10 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/8f14906ce9103ab8f2f1ebda45935a0d61b9d763 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/03cfeeb135428fa83f0791d3f8f94d9298cae695 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/1758730d9eaa3c06cf415c3446d9f6eed9ed3eed | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/92588d187ba4697a322e7aefe5d9e538a87d1cd2 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/dd278d954c0e96a9cbd3cc491e07b8267d25f8d5 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/ea9fea370b8de4ffd72e0ef89550415c15637787 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/9afeca0d569c9fc89d758fe7a9339d1e8afb1546 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e8457ebfd77a46e8d1210e8888ea914ad064558e | 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.