CVE-2026-80845: xfrm: avoid lock inversion in nat keepalive work

Received
AliasesUBUNTU-CVE-2026-80845DEBIAN-CVE-2026-80845
Published 04-09-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-80845 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 5.7% 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
0.17%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 1
MGASA-2026-0506OPENSUSE-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: xfrm: avoid lock inversion in nat keepalive work nat_keepalive_work() walks the state table while xfrm_state_walk() holds net->xfrm.xfrm_state_lock. Its callback then acquires x->lock, which conflicts with the delete path taking the same locks in reverse order via xfrm_state_delete() and __xfrm_state_delete(). This creates an AB-BA deadlock that is reported by lockdep when a NAT keepalive worker races with SA deletion. Fix this by splitting the keepalive walk into two phases. First, collect the candidate states while the walk holds xfrm_state_lock and take a reference on each state. Then, after the walk completes, process each collected state and acquire x->lock without nesting it under xfrm_state_lock.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.17% on 22-09-2026

22-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu121 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)
Debian2 products
  • linux< 6.12.111-1 | < 7.1.13-1
  • linux-6.12< 6.12.111-1~deb12u1
Linux1 product
  • linux≥ f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae, < ea09210462316e5235a25eccb11ad0708d86615e | ≥ f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae, < 5c86c895d1cac81a71ead3005084c6265cf6a7a5 | ≥ f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae, < 89ef3a2e1e4682ab82b0455ce113f8c39fb9e50d | ≥ f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae, < a9fa05b7a1246797748d15771052639e0d3cabf1 | ≥ f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae, < 763fe700b7c58ad64fe5202c5638848244dd4127 | 6.11

3 vendors · 124 products

References

9 links