---
cve: "CVE-2026-31532"
severity: "HIGH"
cvss: 7.8
epss: "12%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-04-23 12:17:01"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-10T14:12:43+02:00"
---

# CVE-2026-31532

> 7.8 HIGH

## Beschreibung

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

can: raw: fix ro->uniq use-after-free in raw_rcv()

raw_release() unregisters raw CAN receive filters via can_rx_unregister(),
but receiver deletion is deferred with call_rcu(). This leaves a window
where raw_rcv() may still be running in an RCU read-side critical section
after raw_release() frees ro->uniq, leading to a use-after-free of the
percpu uniq storage.

Move free_percpu(ro->uniq) out of raw_release() and into a raw-specific
socket destructor. can_rx_unregister() takes an extra reference to the
socket and only drops it from the RCU callback, so freeing uniq from
sk_destruct ensures the percpu area is not released until the relevant
callbacks have drained.

[mkl: applied manually]

## 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 ≥ 5.10.258
- Kernel ≥ 5.15.209
- Kernel ≥ 6.1.175
- Kernel ≥ 6.6.136
- Kernel ≥ 6.12.83
- Kernel ≥ 6.18.24
- Kernel ≥ 6.19.14
- Kernel ≥ 7.0.1

## Referenzen

- <https://git.kernel.org/stable/c/1de30576a6dfeaaa27ef91fa272e6b9240b6fbd3>
- <https://git.kernel.org/stable/c/64c8553decf5a5f2417bd54761ea0a832c56c4ca>
- <https://git.kernel.org/stable/c/3f43f12fde34737fba091b7e3ab391e14ddbb0be>
- <https://git.kernel.org/stable/c/5e9cfffad898bbeaafd0ea608a6d267362f050fc>
- <https://git.kernel.org/stable/c/572f0bf536ebc14f6e7da3d21a85cf076de8358e>
- <https://git.kernel.org/stable/c/1a0f2de81f7fbdc538fc72d7d74609b79bc83cc0>
- <https://git.kernel.org/stable/c/7201a531b9a5ed892bfda5ded9194ef622de8ffa>
- <https://git.kernel.org/stable/c/34c1741254ff972e8375faf176678a248826fe3a>
- <https://git.kernel.org/stable/c/a535a9217ca3f2fccedaafb2fddb4c48f27d36dc>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-31532) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_