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CVE-2024-40966

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: tty: add the option to have a tty reject a new ldisc ...

Published Jul 12, 2024EPSS 0.29%

Overview

CVE-2024-40966 is a medium-severity vulnerability. It was published on July 12, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/287b569a5b914903ba7c438a3c0dbc3410ebb409Refgit.kernel.org/stable/c/3c6332f3bb1578b5b10ac2561247b1d6272ae937Refgit.kernel.org/stable/c/5920ac19964f9e20181f63b410d9200ddbf8dc86Refgit.kernel.org/stable/c/6bd23e0c2bb6c65d4f5754d1456bc9a4427fc59bRefgit.kernel.org/stable/c/287b569a5b914903ba7c438a3c0dbc3410ebb409Refgit.kernel.org/stable/c/3c6332f3bb1578b5b10ac2561247b1d6272ae937Refgit.kernel.org/stable/c/5920ac19964f9e20181f63b410d9200ddbf8dc86Refgit.kernel.org/stable/c/6bd23e0c2bb6c65d4f5754d1456bc9a4427fc59bReflists.debian.org/debian-lts-announce/2025/01/msg00001.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-40966?

CVE-2024-40966 is a medium-severity vulnerability. It was published on July 12, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-40966?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2024-40966?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2024-40966?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-40966 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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