CVE-2026-31406

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-04-06. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

April 6, 2026

Last Modified

July 24, 2026

Advisory Details (4)

Auto-updated Jun 10, 2026
No patch confirmed yet.
generic

xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/daf8e3b253aa760ff9e96c7768a464bc1d6b3c90
generic

xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/32d0f44c2f14d60fe8e920e69a28c11051543ec1
generic

xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2255ed6adbc3100d2c4a83abd9d0396d04b87792
generic

xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/21f2fc49ca6faa393c31da33b8a4e6c41fc84c13

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 6.12.80—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Data Freshness Timeline

(refreshed 14× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 119 total refreshes for this CVE.

  1. 2026-07-26 14:54 UTCEPSS rescore
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  3. 2026-07-26 09:05 UTCEG score recompute
  4. 2026-07-26 09:05 UTCGHSA enrichment
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Frequently asked(5)

What is CVE-2026-31406?
CVE-2026-31406 is a high vulnerability published on April 6, 2026. In the Linux kernel, the following vulnerability has been resolved: xfrm: Fix work re-schedule after cancel in xfrmnatkeepalivenetfini() After canceldelayedwork_sync() is called from xfrmnatkeepalivenetfini(), xfrmstatefini() flushes remaining states via xfrmstatedelete(), which calls…
When was CVE-2026-31406 disclosed?
CVE-2026-31406 was first published in the National Vulnerability Database on April 6, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-31406 actively exploited?
CVE-2026-31406 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 94.5% of all scored CVEs.
What is the CVSS score of CVE-2026-31406?
CVE-2026-31406 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-31406?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31406, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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