SB2026100955 - Race condition in Linux kernel sched
Published: October 9, 2026
Security Bulletin ID
SB2026100955
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-2026-98380)
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 and improper error-pointer validation in tcf_idr_delete_index() in net/sched/act_api.c when deleting traffic control actions. A local user can trigger concurrent action deletion and reservation of the same IDR slot to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/259caa711b7688365676442e2fdb286b8aceaa80
- https://git.kernel.org/stable/c/39b751a210bf61a374afa82749afc7a77a08bf1d
- https://git.kernel.org/stable/c/6bf076258aac4e0af69ef317656c31ce6444d647
- https://git.kernel.org/stable/c/6c9f07bf8800171de2cd3f02815cebe1f4d45f2d
- https://git.kernel.org/stable/c/968550a439f64bd1a6c0d88efb92e4f082f84a26
- https://git.kernel.org/stable/c/a9551f26287debe6d8aa6e8841974661065b975f
- https://git.kernel.org/stable/c/c82b797abe668d0b668601a93ba2c0b071a63574
- https://git.kernel.org/stable/c/dd80a7519824b72c8fcfd3cc50cb93f7e2d90923