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

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Summary

CVECVE-2026-74502
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:55 UTC
Updated2026-08-17 06:19:46 UTC
DescriptionIn 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]>

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.065070000 (date 2026-08-17)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49 e84d2e53a05c78a04d1343eeb0f31a79456e79fc git Not specified
CNA Linux Linux affected 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49 3302aaeac4f7ee6b775850db21d5f61064ce70ad git Not specified
CNA Linux Linux affected 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49 032746c2dd9a4ea0774b04ac8a29e2ea628f106e git Not specified
CNA Linux Linux affected 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49 c57001f55f97ef856fb6527e376c5c4a056a53a4 git Not specified
CNA Linux Linux affected 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49 70c977815af0d997feb2d0c5d284d55689bf7051 git Not specified
CNA Linux Linux affected 6.5 Not specified
CNA Linux Linux unaffected 6.5 semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/70c977815af0d997feb2d0c5d284d55689bf7051 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e84d2e53a05c78a04d1343eeb0f31a79456e79fc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c57001f55f97ef856fb6527e376c5c4a056a53a4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3302aaeac4f7ee6b775850db21d5f61064ce70ad 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/032746c2dd9a4ea0774b04ac8a29e2ea628f106e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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