CVE-2026-80856
Estado: RecibidaSin puntuar—
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:
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.
Detalles técnicos trazas, registros y código del informe original
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 leakedCVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.17%
- Percentil entre todas las CVEs puntuadas: 5
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/03cfeeb135428fa83f0791d3f8f94d9298cae695
- https://git.kernel.org/stable/c/1758730d9eaa3c06cf415c3446d9f6eed9ed3eed
- https://git.kernel.org/stable/c/8f14906ce9103ab8f2f1ebda45935a0d61b9d763
- https://git.kernel.org/stable/c/92588d187ba4697a322e7aefe5d9e538a87d1cd2
- https://git.kernel.org/stable/c/9afeca0d569c9fc89d758fe7a9339d1e8afb1546
- https://git.kernel.org/stable/c/dd278d954c0e96a9cbd3cc491e07b8267d25f8d5
- https://git.kernel.org/stable/c/e8457ebfd77a46e8d1210e8888ea914ad064558e
- https://git.kernel.org/stable/c/ea9fea370b8de4ffd72e0ef89550415c15637787
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-80856",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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{
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{
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{
"status": "unaffected",
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{
"status": "unaffected",
"version": "6.12.108",
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{
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{
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"published": "2026-09-04T16:18:14.660",
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{
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{
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{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"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 └─ do_truncate()\n ├─ dentry_needs_remove_privs() # S_ISUID\n └─ notify_change() # KILL_SUID -> ATTR_MODE\n └─ fuse_setattr() # no killpriv:\n │ # ia_valid |= ATTR_MODE\n └─ fuse_do_setattr()\n ├─ filemap_invalidate_lock() # IS_DAX && is_truncate\n └─ write_inode_now() # is_wb && ATTR_MODE\n └─ if (err) # e.g. daemon -> -EIO\n return err # <- 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."
}
],
"lastModified": "2026-09-04T16:18:14.660",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}