CVE-2024-40966: tty: add the option to have a tty reject a new ldisc
First published: Fri Jul 12 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.1.96 | 6.1.96 |
| redhat/kernel | <6.6.36 | 6.6.36 |
| redhat/kernel | <6.9.7 | 6.9.7 |
| redhat/kernel | <6.10 | 6.10 |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- https://git.kernel.org/stable/c/287b569a5b914903ba7c438a3c0dbc3410ebb409
- https://git.kernel.org/stable/c/3c6332f3bb1578b5b10ac2561247b1d6272ae937
- https://git.kernel.org/stable/c/5920ac19964f9e20181f63b410d9200ddbf8dc86
- https://git.kernel.org/stable/c/6bd23e0c2bb6c65d4f5754d1456bc9a4427fc59b
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-40966
- https://nvd.nist.gov/vuln/detail/CVE-2024-40966
- https://launchpad.net/bugs/cve/CVE-2024-40966
- https://security-tracker.debian.org/tracker/CVE-2024-40966
- https://ubuntu.com/security/CVE-2024-40966
- https://git.kernel.org/linus/6bd23e0c2bb6c65d4f5754d1456bc9a4427fc59b
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi?id=2297550
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