ALSA: ump: do not touch legacy_rmidi before it exists

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98086
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:38 UTC
Updated2026-09-25 11:17:38 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ALSA: ump: do not touch legacy_rmidi before it exists snd_ump_parse_endpoint() sets ump->parsed on every exit, including error, before the caller attaches the legacy rawmidi device. ump_handle_ep_name_msg() then treats parsed as "legacy_rmidi is live" and calls ump_legacy_set_rawmidi_name(), which snprintf()s into ump->legacy_rmidi->name. If a UMP packet arrives in that window (IRQ path from snd_ump_receive), legacy_rmidi is still NULL (KASAN null-ptr-deref in snprintf). Guard the legacy helpers. parsed only means endpoint info was parsed, not that legacy_rmidi exists.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 37e0e14128e0685267dc5c037bf655421a6ce2ea 1c8e01792adf91879322f1ad752f1814de8b7e7d git Not specified
CNA Linux Linux affected 37e0e14128e0685267dc5c037bf655421a6ce2ea 228075f31b141395233218712242913125ace4e0 git Not specified
CNA Linux Linux affected 37e0e14128e0685267dc5c037bf655421a6ce2ea a4cef20cd473e0640fefd38094d4baac0ec76ae3 git Not specified
CNA Linux Linux affected 37e0e14128e0685267dc5c037bf655421a6ce2ea adeee7187694719890aaffdc14b7e89cfd736f1d git Not specified
CNA Linux Linux affected 6.5 Not specified
CNA Linux Linux unaffected 6.5 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a4cef20cd473e0640fefd38094d4baac0ec76ae3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/adeee7187694719890aaffdc14b7e89cfd736f1d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/228075f31b141395233218712242913125ace4e0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1c8e01792adf91879322f1ad752f1814de8b7e7d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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