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Review reviewHigh

CVE-2025-37891

Linux Linux, linux kernel

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...

CVSS
7.8
EPSS
0.21%
11.5% percentile
CISA KEV
Not listed
Published
2025.05.19
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.21%
Technical severityCVSS 7.8

Vulnerability overview

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...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 0b5288f5fe63eab687c14e5940b9e0d532b129f2 < ce4f77bef276e7d2eb7ab03a5d08bcbaa40710ec, >= 0b5288f5fe63eab687c14e5940b9e0d532b129f2 < 226beac5605afbb33f8782148d188b64396145a4, >= 0b5288f5fe63eab687c14e5940b9e0d532b129f2 < 42ef48dd4ebb082a1a90b5c3feeda2e68a9e32fe, >= 0b5288f5fe63eab687c14e5940b9e0d532b129f2 < 56f1f30e6795b890463d9b20b11e576adf5a2f77, >= 6.5, >= 6.5 < 6.6.90, >= 6.7 < 6.12.28, >= 6.13 < 6.14.6, 6.15
Fixed versions
6.6.90, 6.12.28, 6.14.6

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-120