---
cve: "CVE-2026-31516"
severity: "HIGH"
cvss: 7.8
epss: "10%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-04-22 14:16:51"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-15T13:29:42+02:00"
---

# CVE-2026-31516

> 7.8 HIGH

## Beschreibung

In the Linux kernel, the following vulnerability has been resolved:

xfrm: prevent policy_hthresh.work from racing with netns teardown

A XFRM_MSG_NEWSPDINFO request can queue the per-net work item
policy_hthresh.work onto the system workqueue.

The queued callback, xfrm_hash_rebuild(), retrieves the enclosing
struct net via container_of(). If the net namespace is torn down
before that work runs, the associated struct net may already have
been freed, and xfrm_hash_rebuild() may then dereference stale memory.

xfrm_policy_fini() already flushes policy_hash_work during teardown,
but it does not synchronize policy_hthresh.work.

Synchronize policy_hthresh.work in xfrm_policy_fini() as well, so the
queued work cannot outlive the net namespace teardown and access a
freed struct net.

## CVSS-Vektor

```
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- Kernel ≥ 6.12.80
- Kernel ≥ 6.18.21
- Kernel ≥ 6.19.11

## Referenzen

- <https://git.kernel.org/stable/c/56ea2257b83ee29a543f158159e3d1abc1e3e4fe>
- <https://git.kernel.org/stable/c/8854e9367465d784046362698731c1111e3b39b8>
- <https://git.kernel.org/stable/c/4e2e77843fef473ef47e322d52436d8308582a96>
- <https://git.kernel.org/stable/c/29fe3a61bcdce398ee3955101c39f89c01a8a77e>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-31516) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_