ALSA: control: Don't add invalid kcontrols to LED layer

Summary

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.

Timeline

1. Sep 17, 2026, 4:05 PM UTCCVE published
2. Oct 21, 2026, 12:49 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 22d8de62f11b287b279f1d4473a78c7d5e53e7bc · fixed in 6e152cbfac3a2a62f79df7d23d621917c20367eb; From 22d8de62f11b287b279f1d4473a78c7d5e53e7bc · fixed in 3b8a540b36aa064822c701e4e0a1dea2cd4ec5b0; From 22d8de62f11b287b279f1d4473a78c7d5e53e7bc · fixed in 3d20cd049fc5f51f80e24a2db7a3cf00593c79e4; From 22d8de62f11b287b279f1d4473a78c7d5e53e7bc · fixed in 2f0c97b1a32fba8e81a69f6231aa0b3c9b6bc581; From 22d8de62f11b287b279f1d4473a78c7d5e53e7bc · fixed in 18c08f84ca483029f04e426ec7ca3b5d3684cf22; From 22d8de62f11b287b279f1d4473a78c7d5e53e7bc · fixed in 74e3b979ce8b78a690f8b94ccf2e2c965f7f5c11

• Linux Linux

  5.13

• KernelLinux

  From 5.13.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6

References 6