Riskcovery

CVE-2024-40966

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

State
Published
Severity
Not scored
Published
Jul 12, 2024
Updated
May 11, 2026
Reserved
Jul 12, 2024

Read the record on cve.org

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • e1eaea46bb4020b38a141b84f88565d4603f8dd0 to before 3c6332f3bb1578b5b10ac2561247b1d6272ae937Affected
  • e1eaea46bb4020b38a141b84f88565d4603f8dd0 to before 287b569a5b914903ba7c438a3c0dbc3410ebb409Affected
  • e1eaea46bb4020b38a141b84f88565d4603f8dd0 to before 5920ac19964f9e20181f63b410d9200ddbf8dc86Affected
  • e1eaea46bb4020b38a141b84f88565d4603f8dd0 to before 6bd23e0c2bb6c65d4f5754d1456bc9a4427fc59bAffected
LinuxLinux
  • 2.6.35Affected
  • before 2.6.35Not affected
  • 6.1.96 through 6.1.*Not affected
  • 6.6.36 through 6.6.*Not affected
  • 6.9.7 through 6.9.*Not affected
  • 6.10 and laterNot affected

References

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