Description
In the Linux kernel, the following vulnerability has been resolved:
ALSA: control: Don't add invalid kcontrols to LED layer
The kcontrol LED state layer tries to track the all associated kcontrol elements with naive assumptions that they are readable. But one can create a write-only element that has no get callback (even a user element can do it), and this may lead to a NULL dereference at the call chain of snd_ctl_led_notify(), as found by syzkaller.
For avoiding the Oops, add a sanity check of the kcontrol's info and get callbacks, and just skip the invalid kcontrols before assigning the kctl to the LED layer.
Metrics
No CVSS score has been published yet.
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 22d8de62f11b287b279f1d4473a78c7d5e53e7bc, < 6e152cbfac3a2a62f79df7d23d621917c20367eb; >= 22d8de62f11b287b279f1d4473a78c7d5e53e7bc, < 3b8a540b36aa064822c701e4e0a1dea2cd4ec5b0; >= 22d8de62f11b287b279f1d4473a78c7d5e53e7bc, < 3d20cd049fc5f51f80e24a2db7a3cf00593c79e4; >= 22d8de62f11b287b279f1d4473a78c7d5e53e7bc, < 2f0c97b1a32fba8e81a69f6231aa0b3c9b6bc581; >= 22d8de62f11b287b279f1d4473a78c7d5e53e7bc, < 18c08f84ca483029f04e426ec7ca3b5d3684cf22; >= 22d8de62f11b287b279f1d4473a78c7d5e53e7bc, < 74e3b979ce8b78a690f8b94ccf2e2c965f7f5c11 |
| Linux | Linux | 5.13 |
References
- https://git.kernel.org/stable/c/18c08f84ca483029f04e426ec7ca3b5d3684cf22
- https://git.kernel.org/stable/c/2f0c97b1a32fba8e81a69f6231aa0b3c9b6bc581
- https://git.kernel.org/stable/c/3b8a540b36aa064822c701e4e0a1dea2cd4ec5b0
- https://git.kernel.org/stable/c/3d20cd049fc5f51f80e24a2db7a3cf00593c79e4
- https://git.kernel.org/stable/c/6e152cbfac3a2a62f79df7d23d621917c20367eb
- https://git.kernel.org/stable/c/74e3b979ce8b78a690f8b94ccf2e2c965f7f5c11
Timeline
- Published
- Sep 17, 2026
- Last modified
- Oct 21, 2026
- NVD status
- Received