Unknown

CVE-2026-80856 — fuse: fix invalidate lock leak on setattr writeback failure

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.

Published Sep 4, 2026 · Updated Oct 19, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+1

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.17%

ahead of 6% of scored CVEs · Oct 27, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f and < 8f14906ce9103ab8f2f1ebda45935a0d61b9d763≥ 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f and < 03cfeeb135428fa83f0791d3f8f94d9298cae695≥ 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f and < 92588d187ba4697a322e7aefe5d9e538a87d1cd2≥ 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f and < ea9fea370b8de4ffd72e0ef89550415c15637787≥ 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f and < 1758730d9eaa3c06cf415c3446d9f6eed9ed3eed≥ 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f and < dd278d954c0e96a9cbd3cc491e07b8267d25f8d5≥ 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f and < e8457ebfd77a46e8d1210e8888ea914ad064558e≥ 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f and < 9afeca0d569c9fc89d758fe7a9339d1e8afb1546 and 1 more version 5.10	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 27, 2026 · 12 reading(s) · max 0.17%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 4, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 19, 2026 – Oct 19, 2026
1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

10 on the record

git.kernel.org/stable/c/e8457ebfd77a46e8d1210e8888ea914ad064558e
NIST National Vulnerability Database
git.kernel.org/stable/c/03cfeeb135428fa83f0791d3f8f94d9298cae695
NIST National Vulnerability Database
git.kernel.org/stable/c/92588d187ba4697a322e7aefe5d9e538a87d1cd2
NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2026-80856
GitHub Security Advisories
git.kernel.org/stable/c/dd278d954c0e96a9cbd3cc491e07b8267d25f8d5
NIST National Vulnerability Database
git.kernel.org/stable/c/9afeca0d569c9fc89d758fe7a9339d1e8afb1546
NIST National Vulnerability Database
git.kernel.org/stable/c/8f14906ce9103ab8f2f1ebda45935a0d61b9d763
NIST National Vulnerability Database
git.kernel.org/stable/c/1758730d9eaa3c06cf415c3446d9f6eed9ed3eed
NIST National Vulnerability Database
github.com/advisories/GHSA-4jx3-fh7f-pxhw
GitHub Security Advisories
git.kernel.org/stable/c/ea9fea370b8de4ffd72e0ef89550415c15637787
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-99216 Drivers: hv: Don't reset VMBus connection state on error/exit paths 7h
Unknown CVE-2026-99215 power: supply: core: prevent unregistering a power supply while a callback runs 7h
Unknown CVE-2026-99207 scsi: target: Disable interrupts while holding delayed_cmd_lock 7h
Unknown CVE-2026-99208 drm/xe/oa: Zero OA buffer at allocation 7h
Unknown CVE-2026-99209 drm/xe: skip eviction of a BO with no resource 7h
Unknown CVE-2026-99210 accel/rocket: clear rdev on device init failure 7h

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-80856 is "fuse: fix invalidate lock leak on setattr writeback failure", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.17% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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