CVE-2026-74502

Summary

In the Linux kernel, the following vulnerability has been resolved:

ALSA: ump: fix double free of out_cvts on rawmidi error

snd_ump_attach_legacy_rawmidi() allocates the legacy conversion array ump->out_cvts and, on the snd_rawmidi_new() error path, frees it with kfree() but leaves ump->out_cvts pointing at the freed memory. When the endpoint is later torn down, snd_ump_endpoint_free() frees ump->out_cvts a second time, resulting in a double free.

The host snd-usb-audio driver attaches the legacy rawmidi for any USB MIDI 2.0 (UMP) device, so a device that makes snd_rawmidi_new() fail reaches this path on enumeration.

Clear ump->out_cvts after freeing it on the error path so it is not freed again during teardown.

Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>

Affected Software

VendorProductVersion RangeStatus
LinuxLinux33cd7630782df2230529c3e8f1a6d0ae9cd6ab49 < e84d2e53a05c78a04d1343eeb0f31a79456e79fcaffected
LinuxLinux33cd7630782df2230529c3e8f1a6d0ae9cd6ab49 < 3302aaeac4f7ee6b775850db21d5f61064ce70adaffected
LinuxLinux33cd7630782df2230529c3e8f1a6d0ae9cd6ab49 < 032746c2dd9a4ea0774b04ac8a29e2ea628f106eaffected
LinuxLinux33cd7630782df2230529c3e8f1a6d0ae9cd6ab49 < c57001f55f97ef856fb6527e376c5c4a056a53a4affected
LinuxLinux33cd7630782df2230529c3e8f1a6d0ae9cd6ab49 < 70c977815af0d997feb2d0c5d284d55689bf7051affected
LinuxLinux6.5affected
LinuxLinux0 < 6.5unaffected
LinuxLinux6.6.151 <= 6.6.*unaffected
LinuxLinux6.12.103 <= 6.12.*unaffected
LinuxLinux6.18.44 <= 6.18.*unaffected
LinuxLinux7.1.8 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References