7.8

CVE-2026-31406: xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini()

Analyzed
AliasesUBUNTU-CVE-2026-31406DEBIAN-CVE-2026-31406
Published 06-04-2026Last modified 05-08-2026

Vulnerability summary

CVE-2026-31406 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5.4% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.16%
0%100%
Low · -0.01 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 5 · Related 5
SUSE-SU-2026:21834-1SUSE-SU-2026:22029-1SUSE-SU-2026:22034-1SUSE-SU-2026:22036-1SUSE-SU-2026:22037-1

Timeline

  1. 06-04-2026
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini() After cancel_delayed_work_sync() is called from xfrm_nat_keepalive_net_fini(), xfrm_state_fini() flushes remaining states via __xfrm_state_delete(), which calls xfrm_nat_keepalive_state_updated() to re-schedule nat_keepalive_work. The following is a simple race scenario: cpu0 cpu1 cleanup_net() [Round 1] ops_undo_list() xfrm_net_exit() xfrm_nat_keepalive_net_fini() cancel_delayed_work_sync(nat_keepalive_work); xfrm_state_fini() xfrm_state_flush() xfrm_state_delete(x) __xfrm_state_delete(x) xfrm_nat_keepalive_state_updated(x) schedule_delayed_work(nat_keepalive_work); rcu_barrier(); net_complete_free(); net_passive_dec(net); llist_add(&net->defer_free_list, &defer_free_list); cleanup_net() [Round 2] rcu_barrier(); net_complete_free() kmem_cache_free(net_cachep, net); nat_keepalive_work() // on freed net To prevent this, cancel_delayed_work_sync() is replaced with disable_delayed_work_sync().

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

Decrease -0.01 pp

From 0.18% on 04-10-2026

04-10-202603-11-2026

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

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu108 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)
Linux2 products
  • linux≥ f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae, < 32d0f44c2f14d60fe8e920e69a28c11051543ec1 | ≥ f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae, < 2255ed6adbc3100d2c4a83abd9d0396d04b87792 | ≥ f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae, < 21f2fc49ca6faa393c31da33b8a4e6c41fc84c13 | ≥ f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae, < daf8e3b253aa760ff9e96c7768a464bc1d6b3c90 | 6.11
  • linux_kernel≥ 6.11, < 6.12.80 | ≥ 6.13, < 6.18.21 | ≥ 6.19, < 6.19.11 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5
Debian1 product
  • linux< 6.12.85-1 | < 6.19.11-1

3 vendors · 111 products

References

8 links