CVE-2026-80859: linux

CVSS: UnknownReceived
AliasesUBUNTU-CVE-2026-80859DEBIAN-CVE-2026-80859
Published 04-09-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-80859 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 4.2% of scored vulnerabilities.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.15%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:11773-1

Timeline

  1. 04-09-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: fuse: fix missing barrier when checking io-uring readiness fuse_block_alloc() reads fch->initialized and then fch->io_uring. fch->io_uring is set before fch->initialized, ordered by the smp_wmb() in fuse_chan_set_intialized(), but fuse_block_alloc() has no matching read barrier between the two loads. This may lead a CPU to observe fch->initialized=1 but fch->io_uring=0, and skip the check that blocks request allocation until the io-uring queues are ready. This can reintroduce the lock-order inversion deadlock that commit 3393ff964e0f prevents. Add an smp_rmb() barrier to pair with the smp_wmb() in fuse_chan_set_initialized() to prevent this.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.15%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

0.00 pp

From 0.15% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.15%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu120 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 7.2.6-1
Linux1 product
  • linux≥ 3393ff964e0fa5def66570c54a4612bf9df06b76, < 8974575898cd7a4c818088f102b2e7a0286d3302 | ≥ 3393ff964e0fa5def66570c54a4612bf9df06b76, < dd9c835709f4bb3e4256eea7573e4e6e18f956de | ≥ 3393ff964e0fa5def66570c54a4612bf9df06b76, < edb310bc27f0ad83e7fd558a3caf1a94ca511654 | 6.14

3 vendors · 122 products

References

7 links