CVE-2026-80855 (GCVE-0-2026-80855)
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 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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: d58366aab86854217b81679d1a9dcd54a2edfc2a Version: 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b Version: 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b Version: 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b Version: 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b Version: 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b Version: 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b Version: 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b Version: 81775ab858b4236c52c5da7e25cec6e49dd91b46 Version: b57e150ac2eac791d5d187923b73dc2dafaf67fa Version: 1fdbbe246daf348adaa0739463384b16ceba1fc0 Version: 5.15.109 ≤ Version: 5.10.179 ≤ Version: 5.18.18 ≤ Version: 5.19.2 ≤ |
||
{
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}
],
"cpeApplicability": [
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"nodes": [
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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 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."
}
],
"providerMetadata": {
"dateUpdated": "2026-09-04T15:55:07.864Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/1b04d80a27d317064cce2307472f5bef9975bc50"
},
{
"url": "https://git.kernel.org/stable/c/a61524da59a2f5ac9c8de23ff98b30da769ab144"
},
{
"url": "https://git.kernel.org/stable/c/dcf30a56624c2a0cfab1bada5b1ca8cc0c02f010"
},
{
"url": "https://git.kernel.org/stable/c/7288c279ddbd654a06c82118c1a3f5570c1807f0"
},
{
"url": "https://git.kernel.org/stable/c/776e85fda752f9a15e0f82dec42ecacd12a9bd94"
},
{
"url": "https://git.kernel.org/stable/c/1d3e701cda2f41d48aa721b3ebefbe0fbf8d74da"
},
{
"url": "https://git.kernel.org/stable/c/e981474d7bf1457da12404e169ea147d2c8ecea7"
},
{
"url": "https://git.kernel.org/stable/c/a927f1867e61b78f39f9da0bbba3c98c2ca151fe"
}
],
"title": "fuse: fix invalidate lock leak on open O_TRUNC DAX failure",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-80855",
"datePublished": "2026-09-04T15:55:07.864Z",
"dateReserved": "2026-08-26T14:34:25.797Z",
"dateUpdated": "2026-09-04T15:55:07.864Z",
"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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