CVE-2025-37891ALSA: ump: Fix buffer overflow at UMP SysEx message conversion
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In the Linux kernel, the following vulnerability has been resolved: ALSA: ump: Fix buffer overflow at UMP SysEx message conversion The conversion function from MIDI 1.0 to UMP packet contains an internal buffer to keep the incoming MIDI bytes, and its size is 4, as it was supposed to be the max size for a MIDI1 UMP packet data. However, the implementation overlooked that SysEx is handled in a different format, and it can be up to 6 bytes, as found in do_convert_to_ump(). It leads eventually to a buffer overflow, and may corrupt the memory when a longer SysEx message is received. The fix is simply to extend the buffer size to 6 to fit with the SysEx UMP message.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from 0b5288f5fe63eab687c14e5940b9e0d532b129f2 before ce4f77bef276e7d2eb7ab03a5d08bcbaa40710ec; from 0b5288f5fe63eab687c14e5940b9e0d532b129f2 before 226beac5605afbb33f8782148d188b64396145a4; from 0b5288f5fe63eab687c14e5940b9e0d532b129f2 before 42ef48dd4ebb082a1a90b5c3feeda2e68a9e32fe; from 0b5288f5fe63eab687c14e5940b9e0d532b129f2 before 56f1f30e6795b890463d9b20b11e576adf5a2f77 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.5 before 6.6.90; from 6.7 before 6.12.28; from 6.13 before 6.14.6; 6.15; 6.15; 6.15; 6.15 | NVD |
References
- https://git.kernel.org/stable/c/ce4f77bef276e7d2eb7ab03a5d08bcbaa40710ecpatch
- https://git.kernel.org/stable/c/226beac5605afbb33f8782148d188b64396145a4patch
- https://git.kernel.org/stable/c/42ef48dd4ebb082a1a90b5c3feeda2e68a9e32fepatch
- https://git.kernel.org/stable/c/56f1f30e6795b890463d9b20b11e576adf5a2f77patch
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.