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 <baul.lee@xbow.com>
Metrics
No CVSS score has been published yet.
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49, < e84d2e53a05c78a04d1343eeb0f31a79456e79fc; >= 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49, < 3302aaeac4f7ee6b775850db21d5f61064ce70ad; >= 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49, < 032746c2dd9a4ea0774b04ac8a29e2ea628f106e; >= 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49, < c57001f55f97ef856fb6527e376c5c4a056a53a4; >= 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49, < 70c977815af0d997feb2d0c5d284d55689bf7051 |
| Linux | Linux | 6.5 |
References
- https://git.kernel.org/stable/c/032746c2dd9a4ea0774b04ac8a29e2ea628f106e
- https://git.kernel.org/stable/c/3302aaeac4f7ee6b775850db21d5f61064ce70ad
- https://git.kernel.org/stable/c/70c977815af0d997feb2d0c5d284d55689bf7051
- https://git.kernel.org/stable/c/c57001f55f97ef856fb6527e376c5c4a056a53a4
- https://git.kernel.org/stable/c/e84d2e53a05c78a04d1343eeb0f31a79456e79fc
Timeline
- Published
- Aug 15, 2026
- Last modified
- Aug 17, 2026
- NVD status
- Received