SB20260919112 - Integer overflow in Linux kernel sched
Published: September 19, 2026
Security Bulletin ID
SB20260919112
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) Integer overflow (CVE-ID: CVE-2026-90109)
CWE-ID: CWE-190 - Integer overflow
CVSSv4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local privileged user to cause a denial of service.
The vulnerability exists due to a 32-bit integer overflow in the gred_enqueue(), bfifo_enqueue(), and plug_enqueue() queue admission functions when calculating queue admission with a backlog exceeding 4 GiB. A local privileged user can attach a qdisc with a queue limit near 4 GiB and enqueue more than 4 GiB of traffic to cause a denial of service.
Remediation
Install update from vendor's website.