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Review reviewHigh

CVE-2026-31406

Linux Linux, linux kernel

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_...

CVSS
7.8
EPSS
0.16%
5.55% percentile
CISA KEV
Not listed
Published
2026.04.06
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.16%
Technical severityCVSS 7.8

Vulnerability overview

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_...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae < 32d0f44c2f14d60fe8e920e69a28c11051543ec1, >= f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae < 2255ed6adbc3100d2c4a83abd9d0396d04b87792, >= f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae < 21f2fc49ca6faa393c31da33b8a4e6c41fc84c13, >= f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae < daf8e3b253aa760ff9e96c7768a464bc1d6b3c90, >= 6.11, >= 6.11 < 6.12.80, >= 6.13 < 6.18.21, >= 6.19 < 6.19.11, 7.0
Fixed versions
6.12.80, 6.18.21, 6.19.11

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available