CVE-2024-40966

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinuxe1eaea46bb4020b38a141b84f88565d4603f8dd0 < 3c6332f3bb1578b5b10ac2561247b1d6272ae937affected
LinuxLinuxe1eaea46bb4020b38a141b84f88565d4603f8dd0 < 287b569a5b914903ba7c438a3c0dbc3410ebb409affected
LinuxLinuxe1eaea46bb4020b38a141b84f88565d4603f8dd0 < 5920ac19964f9e20181f63b410d9200ddbf8dc86affected
LinuxLinuxe1eaea46bb4020b38a141b84f88565d4603f8dd0 < 6bd23e0c2bb6c65d4f5754d1456bc9a4427fc59baffected
LinuxLinux2.6.35affected
LinuxLinux0 < 2.6.35unaffected
LinuxLinux6.1.96 <= 6.1.*unaffected
LinuxLinux6.6.36 <= 6.6.*unaffected
LinuxLinux6.9.7 <= 6.9.*unaffected
LinuxLinux6.10 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References