CVE-2026-74502: ALSA: ump: fix double free of out_cvts on rawmidi error

Received
AliasesUBUNTU-CVE-2026-74502DEBIAN-CVE-2026-74502
Published 15-08-2026Last modified 17-08-2026

Vulnerability summary

CVE-2026-74502 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.1% of scored vulnerabilities.

Priority
Insufficient evidence

No CVSS vector published; no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.17%
0%100%
Low · -0.04 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 3
SUSE-SU-2026:5091-1USN-8959-1USN-8960-1

Timeline

  1. 15-08-2026
    PublishedVulnerability first disclosed.
  2. 17-08-2026
    Last modifiedVulnerability information updated.

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>

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

Decrease -0.04 pp

From 0.21% on 06-10-2026

06-10-202605-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: not stated in public data.

Ubuntu142 products
  • linuxAll versions (No fix recorded) | < 7.0.0-42.42
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 7.0.0-1016.17
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.12.105-1 | < 7.1.8-1
  • linux-6.12< 6.12.107-1~deb12u1
Linux1 product
  • linux≥ 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49, < e84d2e53a05c78a04d1343eeb0f31a79456e79fc | ≥ 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49, < 3302aaeac4f7ee6b775850db21d5f61064ce70ad | ≥ 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49, < 032746c2dd9a4ea0774b04ac8a29e2ea628f106e | ≥ 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49, < c57001f55f97ef856fb6527e376c5c4a056a53a4 | ≥ 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49, < 70c977815af0d997feb2d0c5d284d55689bf7051 | 6.5

3 vendors · 145 products

References

11 links
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