---
cve: "CVE-2024-40966"
severity: "LOW"
cvss: 3.1
epss: "29%"
vendor: "Linux"
kev: false
exploited: false
published: "2024-07-12 13:15:18"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-13T10:09:58+02:00"
---

# CVE-2024-40966

> 3.1 LOW

## Beschreibung

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

tty: add the option to have a tty reject a new ldisc

... and use it to limit the virtual terminals to just N_TTY.  They are
kind of special, and in particular, the "con_write()" routine violates
the "writes cannot sleep" rule that some ldiscs rely on.

This avoids the

   BUG: sleeping function called from invalid context at kernel/printk/printk.c:2659

when N_GSM has been attached to a virtual console, and gsmld_write()
calls con_write() while holding a spinlock, and con_write() then tries
to get the console lock.

## Patch verfügbar (OSV)

- Kernel ≥ 6.1.96
- Kernel ≥ 6.6.36
- Kernel ≥ 6.9.7

## Referenzen

- <https://git.kernel.org/stable/c/3c6332f3bb1578b5b10ac2561247b1d6272ae937>
- <https://git.kernel.org/stable/c/287b569a5b914903ba7c438a3c0dbc3410ebb409>
- <https://git.kernel.org/stable/c/5920ac19964f9e20181f63b410d9200ddbf8dc86>
- <https://git.kernel.org/stable/c/6bd23e0c2bb6c65d4f5754d1456bc9a4427fc59b>
- <https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2024-40966) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_