---
cve: "CVE-2023-52480"
severity: "CRITICAL"
cvss: 9.8
epss: "49%"
vendor: "Linux"
kev: false
exploited: false
published: "2024-02-29 06:15:46"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-10T23:45:47+02:00"
---

# CVE-2023-52480

> 9.8 CRITICAL

## Beschreibung

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

ksmbd: fix race condition between session lookup and expire

 Thread A                        +  Thread B
 ksmbd_session_lookup            |  smb2_sess_setup
   sess = xa_load                |
                                 |
                                 |    xa_erase(&conn->sessions, sess->id);
                                 |
                                 |    ksmbd_session_destroy(sess) --> kfree(sess)
                                 |
   // UAF!                       |
   sess->last_active = jiffies   |
                                 +

This patch add rwsem to fix race condition between ksmbd_session_lookup
and ksmbd_expire_session.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- Kernel ≥ 6.1.57
- Kernel ≥ 6.5.7

## Referenzen

- <https://git.kernel.org/stable/c/c77fd3e25a51ac92b0f1b347a96eff6a0b4f066f>
- <https://git.kernel.org/stable/c/a2ca5fd3dbcc665e1169044fa0c9e3eba779202b>
- <https://git.kernel.org/stable/c/18ced78b0ebccc2d16f426143dc56ab3aad666be>
- <https://git.kernel.org/stable/c/53ff5cf89142b978b1a5ca8dc4d4425e6a09745f>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2023-52480) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_