CVE-2026-80856 (GCVE-0-2026-80856)
Vulnerability from cvelistv5
Published
2026-09-04 15:55
Modified
2026-09-04 15:55
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f Version: 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f Version: 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f Version: 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f Version: 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f Version: 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f Version: 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f Version: 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f |
||
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"descriptions": [
{
"lang": "en",
"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."
}
],
"providerMetadata": {
"dateUpdated": "2026-09-04T15:55:09.250Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
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"url": "https://git.kernel.org/stable/c/8f14906ce9103ab8f2f1ebda45935a0d61b9d763"
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{
"url": "https://git.kernel.org/stable/c/03cfeeb135428fa83f0791d3f8f94d9298cae695"
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{
"url": "https://git.kernel.org/stable/c/92588d187ba4697a322e7aefe5d9e538a87d1cd2"
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{
"url": "https://git.kernel.org/stable/c/ea9fea370b8de4ffd72e0ef89550415c15637787"
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{
"url": "https://git.kernel.org/stable/c/1758730d9eaa3c06cf415c3446d9f6eed9ed3eed"
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{
"url": "https://git.kernel.org/stable/c/dd278d954c0e96a9cbd3cc491e07b8267d25f8d5"
},
{
"url": "https://git.kernel.org/stable/c/e8457ebfd77a46e8d1210e8888ea914ad064558e"
},
{
"url": "https://git.kernel.org/stable/c/9afeca0d569c9fc89d758fe7a9339d1e8afb1546"
}
],
"title": "fuse: fix invalidate lock leak on setattr writeback failure",
"x_generator": {
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"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-80856",
"datePublished": "2026-09-04T15:55:09.250Z",
"dateReserved": "2026-08-26T14:34:25.797Z",
"dateUpdated": "2026-09-04T15:55:09.250Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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