---
cve: "CVE-2024-27058"
severity: "HIGH"
cvss: 7.8
epss: "0.4%"
vendor: "Linux"
kev: false
exploited: false
published: "2024-05-01 13:15:50"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T18:41:06+02:00"
---

# CVE-2024-27058

> 7.8 HIGH

## Beschreibung

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

tmpfs: fix race on handling dquot rbtree

A syzkaller reproducer found a race while attempting to remove dquot
information from the rb tree.

Fetching the rb_tree root node must also be protected by the
dqopt->dqio_sem, otherwise, giving the right timing, shmem_release_dquot()
will trigger a warning because it couldn't find a node in the tree, when
the real reason was the root node changing before the search starts:

Thread 1				Thread 2
- shmem_release_dquot()			- shmem_{acquire,release}_dquot()

- fetch ROOT				- Fetch ROOT

					- acquire dqio_sem
- wait dqio_sem

					- do something, triger a tree rebalance
					- release dqio_sem

- acquire dqio_sem
- start searching for the node, but
  from the wrong location, missing
  the node, and triggering a warning.

## 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 ≥ 6.6.24
- Kernel ≥ 6.7.12
- Kernel ≥ 6.8.3

## Referenzen

- <https://git.kernel.org/stable/c/c7077f43f30d817d10a9f8245e51576ac114b2f0>
- <https://git.kernel.org/stable/c/617d55b90e73c7b4aa2733ca6cc3f9b72d1124bb>
- <https://git.kernel.org/stable/c/f82f184874d2761ebaa60dccf577921a0dbb3810>
- <https://git.kernel.org/stable/c/0a69b6b3a026543bc215ccc866d0aea5579e6ce2>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2024-27058) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_