SB2026091913 - Race condition in Linux kernel core seq
Published: September 19, 2026
Security Bulletin ID
SB2026091913
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Race condition (CVE-ID: CVE-2026-90207)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a race condition in the ALSA sequencer MIDI input event handler when closing a rawmidi substream while input events are being processed. A local user can trigger an input event during substream teardown to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/210c193a9ef1312fab153948c6928e4cfaa1f03b
- https://git.kernel.org/stable/c/282a3ef9e4b63b2f6823bbbb3c1a90b002cdaf12
- https://git.kernel.org/stable/c/403f7f3ad3808a0096d84cf228fab68dc253fd9d
- https://git.kernel.org/stable/c/6290afaae54c7a9fa3bca3b4d5433e6d83e8669d
- https://git.kernel.org/stable/c/89d986897aff7275b42e075e556731b8353366af
- https://git.kernel.org/stable/c/de76a2b47582cd6dba2e15f024681bf377ecc94a