Medium 5.5Published Jun 25, 2026

CVE-2026-53241ALSA: seq: dummy: fix UMP event stack overread

Updated under an hour ago (Oct 27, 2026, 1:40 AM ET)

Does this affect you?

It affects Linux and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Linux

Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: dummy: fix UMP event stack overread The dummy sequencer port forwards events by copying an incoming struct snd_seq_event into a stack temporary, rewriting source and destination, and dispatching the temporary to subscribers. That legacy event storage is smaller than struct snd_seq_ump_event. When a UMP event reaches the dummy client, the copy leaves the UMP flag set but only provides legacy-sized stack storage. The subscriber delivery path then uses snd_seq_event_packet_size() and copies a UMP-sized packet from that stack object, reading past the end of the temporary. Use the existing union __snd_seq_event storage and copy the packet size reported for the incoming event before rewriting the common routing fields. This preserves the full UMP packet for UMP events while keeping legacy event handling unchanged.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Jun 25, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 32cb23a0f911317cdb5030035e49a204aa86fef5 before a7ef78a2c536242ccb7a4429da01580b2409bb24; from 32cb23a0f911317cdb5030035e49a204aa86fef5 before 6671a46144f880c5a167930ebb14c12f3d059fe9; from 32cb23a0f911317cdb5030035e49a204aa86fef5 before 6676b6063440561db600494049ce7ffb695c8cc4; 32cb23a0f911317cdb5030035e49a204aa86fef5 builds before 2b5ff4db5d7aa5b981d966df02e687f79ad7b311	CNA record
linux linux_kernel linux:linux_kernel	from 6.10 before 6.12.94; from 6.13 before 6.18.36; from 6.19 before 7.0.13; 7.1; 7.1; 7.1; 7.1; 7.1; and 1 more ranges	NVD

References

References

https://git.kernel.org/stable/c/a7ef78a2c536242ccb7a4429da01580b2409bb24	patch
https://git.kernel.org/stable/c/6671a46144f880c5a167930ebb14c12f3d059fe9	patch
https://git.kernel.org/stable/c/6676b6063440561db600494049ce7ffb695c8cc4	patch
https://git.kernel.org/stable/c/2b5ff4db5d7aa5b981d966df02e687f79ad7b311	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.