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.
22d8de62f11b287b279f1d4473a78c7d5e53e7bc builds before 6e152cbfac3a2a62f79df7d23d621917c20367eb; 22d8de62f11b287b279f1d4473a78c7d5e53e7bc builds before 3b8a540b36aa064822c701e4e0a1dea2cd4ec5b0; 22d8de62f11b287b279f1d4473a78c7d5e53e7bc builds before 3d20cd049fc5f51f80e24a2db7a3cf00593c79e4; 22d8de62f11b287b279f1d4473a78c7d5e53e7bc builds before 2f0c97b1a32fba8e81a69f6231aa0b3c9b6bc581; 22d8de62f11b287b279f1d4473a78c7d5e53e7bc builds before 18c08f84ca483029f04e426ec7ca3b5d3684cf22; from 22d8de62f11b287b279f1d4473a78c7d5e53e7bc before 74e3b979ce8b78a690f8b94ccf2e2c965f7f5c11
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.
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