CVE-2026-90060

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux22d8de62f11b287b279f1d4473a78c7d5e53e7bc < 6e152cbfac3a2a62f79df7d23d621917c20367ebaffected
LinuxLinux22d8de62f11b287b279f1d4473a78c7d5e53e7bc < 3d20cd049fc5f51f80e24a2db7a3cf00593c79e4affected
LinuxLinux22d8de62f11b287b279f1d4473a78c7d5e53e7bc < 2f0c97b1a32fba8e81a69f6231aa0b3c9b6bc581affected
LinuxLinux22d8de62f11b287b279f1d4473a78c7d5e53e7bc < 18c08f84ca483029f04e426ec7ca3b5d3684cf22affected
LinuxLinux22d8de62f11b287b279f1d4473a78c7d5e53e7bc < 74e3b979ce8b78a690f8b94ccf2e2c965f7f5c11affected
LinuxLinux5.13affected
LinuxLinux0 < 5.13unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References