SB20260815198 - Improper Initialization in Linux kernel sched
Published: August 15, 2026
Security Bulletin ID
SB20260815198
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) Improper Initialization (CVE-ID: CVE-2026-74267)
CWE-ID: CWE-665 - Improper Initialization
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/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 improper state management in sch_codel when peeking queued packets after packet drops. A local user can trigger packet drops during peek to cause a denial of service.
The issue can incorrectly invoke the parent qlen_notify callback while a packet still remains queued, which may deactivate the parent class unexpectedly.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/52f1da34c9f4d5bdc1e8b44242da5c7ba8db85f3
- https://git.kernel.org/stable/c/755108bb7a5083e911294c416cfea605dc75632f
- https://git.kernel.org/stable/c/7a05af7f58566682b73578b72ca8e53a268c43bd
- https://git.kernel.org/stable/c/91e0a793a72374c20ab31a40ccec21373e82e973
- https://git.kernel.org/stable/c/bb9cfd874ee884117b33e92a002b9a45b48202f4
- https://git.kernel.org/stable/c/e4615aa6bb7802944ae790cb4b3ef8c1b7491af3
- https://git.kernel.org/stable/c/e8c6dbadf139cb14ea6ed14add6ed6e88504dedd
- https://git.kernel.org/stable/c/eba49fd85995a3851c597fa2d214f8d21736e1d8