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Medium severity5.5NVD Advisory· Published Jul 12, 2024· Updated Jun 17, 2026

CVE-2024-40966

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

121

Patches

Vulnerability mechanics

References

5

News mentions

0

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