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NVD / CVE Program· CNA Linux

CVE-2026-80855: fuse: fix invalidate lock leak on open O_TRUNC DAX failure

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.18% (FIRST EPSS).
  • Fixed version: Linux Linux 1b04d80a27d317064cce2307472f5bef9975bc50, 1d3e701cda2f41d48aa721b3ebefbe0fbf8d74da, 5.10.273; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.

Low priority for now. Upgrade to Linux Linux 1b04d80a27d317064cce2307472f5bef9975bc50, 1d3e701cda2f41d48aa721b3ebefbe0fbf8d74da, 5.10.273; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Sep 4, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • b57e150ac2eac791d5d187923b73dc2dafaf67fa, 1fdbbe246daf348adaa0739463384b16ceba1fc0, 6.0affected
    • 81775ab858b4236c52c5da7e25cec6e49dd91b46 and later · before 69a294e561c10909688bcb25456535dcd1818e1aaffected · git
    • d58366aab86854217b81679d1a9dcd54a2edfc2a and later · before 1b04d80a27d317064cce2307472f5bef9975bc50affected · git
    • 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b and later · before a61524da59a2f5ac9c8de23ff98b30da769ab144affected · git
    • 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b and later · before dcf30a56624c2a0cfab1bada5b1ca8cc0c02f010affected · git
    • 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b and later · before 7288c279ddbd654a06c82118c1a3f5570c1807f0affected · git
    • 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b and later · before 776e85fda752f9a15e0f82dec42ecacd12a9bd94affected · git
    • 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b and later · before 1d3e701cda2f41d48aa721b3ebefbe0fbf8d74daaffected · git
    • 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b and later · before e981474d7bf1457da12404e169ea147d2c8ecea7affected · git
    • 2fdbb8dd01556e1501132b5ad3826e8f71e24a8b and later · before a927f1867e61b78f39f9da0bbba3c98c2ca151feaffected · git

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.1.13-17.1.13-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-80853Sep 4, 2026 · KVM: SEV: Allocate full pages for {DE,EN}CRYPT ops on SNP-enabled hosts
    0Monitor
  • ← EarlierCVE-2026-80854Sep 4, 2026 · usb: gadget: f_tcm: keep port count until LUN teardown completes
    0Monitor
  • Later →CVE-2026-80856Sep 4, 2026 · fuse: fix invalidate lock leak on setattr writeback failure
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux1b04d80a27d317064cce2307472f5bef9975bc50Vendor (CNA)
Linux Linux1d3e701cda2f41d48aa721b3ebefbe0fbf8d74daVendor (CNA)
Linux Linux5.10.273Vendor (CNA)
Linux Linux5.15.220Vendor (CNA)
Linux Linux5.19Vendor (CNA)
Linux Linux5.20Vendor (CNA)
Linux Linux69a294e561c10909688bcb25456535dcd1818e1aVendor (CNA)
Linux Linux7288c279ddbd654a06c82118c1a3f5570c1807f0Vendor (CNA)
Linux Linux776e85fda752f9a15e0f82dec42ecacd12a9bd94Vendor (CNA)
Linux Linuxa61524da59a2f5ac9c8de23ff98b30da769ab144Vendor (CNA)
Linux Linuxa927f1867e61b78f39f9da0bbba3c98c2ca151feVendor (CNA)
Linux Linuxdcf30a56624c2a0cfab1bada5b1ca8cc0c02f010Vendor (CNA)
Linux Linuxe981474d7bf1457da12404e169ea147d2c8ecea7Vendor (CNA)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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