All vulnerabilities
CVE-2026-98086

Linux: ALSA: ump: do not touch legacy_rmidi before it exists

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.20%Chance of exploitation activity in the next 30 days, higher than 9% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in1c8e01792adf91879322f1ad752f1814de8b7e7dAlso 228075f31b141395233218712242913125ace4e0CVE List
Published25 Sep 2026Updated 19 Oct 2026CVE List

What fixes it

  • 1c8e01792adf91879322f1ad752f1814de8b7e7dLinuxCVE List
  • 228075f31b141395233218712242913125ace4e0LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

In 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.

Text from CVE List

Affected versions 12

  • Linuxaffected: 37e0e14128e0685267dc5c037bf655421a6ce2ea before d6f9af093dc91dac8848a01e417b8109c651c0b2CVE List
  • Linuxaffected: 37e0e14128e0685267dc5c037bf655421a6ce2ea before 1c8e01792adf91879322f1ad752f1814de8b7e7dCVE List
  • Linuxaffected: 37e0e14128e0685267dc5c037bf655421a6ce2ea before 228075f31b141395233218712242913125ace4e0CVE List
  • Linuxaffected: 37e0e14128e0685267dc5c037bf655421a6ce2ea before a4cef20cd473e0640fefd38094d4baac0ec76ae3CVE List
  • Linuxaffected: 37e0e14128e0685267dc5c037bf655421a6ce2ea before adeee7187694719890aaffdc14b7e89cfd736f1dCVE List
  • Linuxaffected: 6.5CVE List
  • Linuxunaffected: all versions before 6.5CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.111 through 6.12.*CVE List
  • Linuxunaffected: 6.18.53 through 6.18.*CVE List
  • Linuxunaffected: 7.2.7 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 5