CVE-2026-31406

Advisory lineage Upstream: 0 Downstream: 7
Analyzed
Published: 06 Apr 2026, 07:38
Last modified:11 May 2026, 22:08

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (cve.org)
EPSS Score
0.16% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

06 Apr 2026, 07:38
Published
Vulnerability first disclosed
11 May 2026, 22:08
Last Modified
Vulnerability 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

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.16%• Percentile: 5%

Affected Systems

  • linux•linux

    ≥ f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae, < 32d0f44c2f14d60fe8e920e69a28c11051543ec1 | ≥ f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae, < 2255ed6adbc3100d2c4a83abd9d0396d04b87792 | ≥ f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae, < 21f2fc49ca6faa393c31da33b8a4e6c41fc84c13 | ≥ f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae, < daf8e3b253aa760ff9e96c7768a464bc1d6b3c90 | 6.11

  • linux•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

References (4)