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
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
e1eaea46bb4020b38a141b84f88565d4603f8dd0 to < 3c6332f3bb1578b5b10ac2561247b1d6272ae937affectede1eaea46bb4020b38a141b84f88565d4603f8dd0 to < 287b569a5b914903ba7c438a3c0dbc3410ebb409affectede1eaea46bb4020b38a141b84f88565d4603f8dd0 to < 5920ac19964f9e20181f63b410d9200ddbf8dc86affectede1eaea46bb4020b38a141b84f88565d4603f8dd0 to < 6bd23e0c2bb6c65d4f5754d1456bc9a4427fc59baffected
Linux Linux
Default version status: affected
2.6.35affected0 to < 2.6.35unaffected6.1.96 to ≤ 6.1.*unaffected6.6.36 to ≤ 6.6.*unaffected6.9.7 to ≤ 6.9.*unaffected6.10 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/3c6332f3bb1578b5b10ac2561247b1d6272ae937 ↗
- https://git.kernel.org/stable/c/287b569a5b914903ba7c438a3c0dbc3410ebb409 ↗
- https://git.kernel.org/stable/c/5920ac19964f9e20181f63b410d9200ddbf8dc86 ↗
- https://git.kernel.org/stable/c/6bd23e0c2bb6c65d4f5754d1456bc9a4427fc59b ↗
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html ↗