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TI-2025-25239 Aliases CVE-2025-37891GHSA-6875-67c4-4637

ALSA: ump: Fix buffer overflow at UMP SysEx message conversion

Priority LOW 36CWE-120Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 15 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-120 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00245 15th percentileScored 2026-11-07
Fix Partial Linux (Linux): 6.6.90, 6.12.28, 6.14.6 +1Red Hat: 3 advisoriesRed Hat: 15 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux6.5 and later6.6.90, 6.12.28, 6.14.6, 6.15Patch availableCNA
  • Linux VendorLinux Affected 6.5 and later Fixed in 6.6.90, 6.12.28, 6.14.6, 6.15 Patch available CNA

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*6.5 to before 6.6.90; 6.7 to before 6.12.28; 6.13 to before 6.14.6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:*6.15 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:*6.15 rc2VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:*6.15 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.15:rc4:*:*:*:*:*:*6.15 rc4VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.5 to before 6.6.90; 6.7 to before 6.12.28; 6.13 to before 6.14.6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:* Versions 6.15 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:* Versions 6.15 rc2 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:* Versions 6.15 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.15:rc4:*:*:*:*:*:* Versions 6.15 rc4 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.6.90, 6.12.28, 6.14.6, 6.15

Red Hat 3 advisories

  • RHSA-2026:1236 Released 2026-01-26 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.55.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.55.1.el10_0, kernel-64k-devel-6.12.0-55.55.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.55.1.el10_0, kernel-64k-6.12.0-55.55.1.el10_0, kernel-64k-core-6.12.0-55.55.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.55.1.el10_0, libperf-6.12.0-55.55.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.55.1.el10_0, kernel-rt-64k-6.12.0-55.55.1.el10_0, kernel-rt-64k-core-6.12.0-55.55.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.55.1.el10_0, kernel-rt-core-6.12.0-55.55.1.el10_0, kernel-rt-debug-6.12.0-55.55.1.el10_0 +11
  • RHSA-2026:0917 Released 2026-01-21 · Red Hat rating Moderate
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) kernel-tools-libs-devel-5.14.0-427.107.1.el9_4, libperf-5.14.0-427.107.1.el9_4
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) kernel-64k-debug-devel-5.14.0-427.107.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.107.1.el9_4, kernel-64k-devel-5.14.0-427.107.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool-7.3.0-427.107.1.el9_4, kernel-5.14.0-427.107.1.el9_4, kernel-64k-5.14.0-427.107.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt-5.14.0-427.107.1.el9_4, kernel-rt-core-5.14.0-427.107.1.el9_4, kernel-rt-debug-5.14.0-427.107.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt-5.14.0-427.107.1.el9_4, kernel-rt-core-5.14.0-427.107.1.el9_4, kernel-rt-debug-5.14.0-427.107.1.el9_4 +11
  • RHSA-2026:0804 Released 2026-01-19 · Red Hat rating Important
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.79.1.el9_6, libperf-5.14.0-570.79.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.79.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.79.1.el9_6, kernel-64k-devel-5.14.0-570.79.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.79.1.el9_6, kernel-64k-5.14.0-570.79.1.el9_6, kernel-64k-core-5.14.0-570.79.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.79.1.el9_6, kernel-rt-64k-5.14.0-570.79.1.el9_6, kernel-rt-64k-core-5.14.0-570.79.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.79.1.el9_6, kernel-rt-core-5.14.0-570.79.1.el9_6, kernel-rt-debug-5.14.0-570.79.1.el9_6 +11

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat CodeReady Linux Builder EUS (v.9.4)Fixed RHSA-2026:0917
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:0804
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:1236
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:0917
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:0804
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:1236
Red Hat Enterprise Linux BaseOS EUS (v.9.4)Fixed RHSA-2026:0917
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:0804
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:1236
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:1236
Red Hat Enterprise Linux Real Time EUS (v.9.4)Fixed RHSA-2026:0917
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2026:0804
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:1236
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4)Fixed RHSA-2026:0917
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2026:0804
Not affected: 4 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-37891
  2. 2026-10-03 Alias added: GHSA-6875-67c4-4637
  3. 2026-10-16 CISA SSVC decision points changed
  4. 2026-10-29 Affected versions changed · Red Hat

References

Patch 4

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences