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Unrated severityNVD Advisory· Published Jul 12, 2024· Updated Jan 5, 2026

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

CVE-2024-40966

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.

Affected products

118

Patches

4
6bd23e0c2bb6
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
5920ac19964f
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
287b569a5b91
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
3c6332f3bb15
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit

Vulnerability mechanics

Generated on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

4

News mentions

0

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