CVE-2026-74502 ALSA: ump: fix double free of out_cvts on rawmidi error
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-74502?
CVE-2026-74502 is a vulnerability in Linux, published on 15 Aug 2026.
Official description
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 <[email protected]>
Which versions are affected by CVE-2026-74502?
How do I fix CVE-2026-74502?
Upgrade to a fixed version.
Is CVE-2026-74502 being exploited?
There is no known exploitation of CVE-2026-74502 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74502, DEBIAN-CVE-2026-74502, GHSA-rpcv-w828-3j36, UBUNTU-CVE-2026-74502.