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CVE-2025-37891— ALSA: ump: Fix buffer overflow at UMP SysEx message conversion

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于UMP SysEx消息转换缓冲区溢出，可能导致内存损坏。

CVSS 7.8 · High EPSS 0.24% · P16

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 0b5288f5fe63eab687c14e5940b9e0d532b129f2< ce4f77bef276e7d2eb7ab03a5d08bcbaa40710ec affected
0b5288f5fe63eab687c14e5940b9e0d532b129f2< 226beac5605afbb33f8782148d188b64396145a4 affected
0b5288f5fe63eab687c14e5940b9e0d532b129f2< 42ef48dd4ebb082a1a90b5c3feeda2e68a9e32fe affected
0b5288f5fe63eab687c14e5940b9e0d532b129f2< 56f1f30e6795b890463d9b20b11e576adf5a2f77 affected
6.5 affected
< 6.5 unaffected
6.6.90≤ 6.6.* unaffected
6.12.28≤ 6.12.* unaffected
… +2 more rows
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I. Basic Information for CVE-2025-37891

Vulnerability Information
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Vulnerability Title
ALSA: ump: Fix buffer overflow at UMP SysEx message conversion
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于UMP SysEx消息转换缓冲区溢出，可能导致内存损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 0b5288f5fe63eab687c14e5940b9e0d532b129f2 ~ ce4f77bef276e7d2eb7ab03a5d08bcbaa40710ec -
Linux Linux 6.5 -

II. Public POCs for CVE-2025-37891

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III. Intelligence Information for CVE-2025-37891

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IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux