SB2025031265 - NULL pointer dereference in Linux kernel sched
Published: March 12, 2025 Updated: May 11, 2025
Security Bulletin ID
SB2025031265
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 security vulnerability.
1) NULL pointer dereference (CVE-ID: CVE-2025-21857)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to NULL pointer dereference within the tcf_exts_miss_cookie_base_alloc() function in net/sched/cls_api.c. A local user can perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/071ed42cff4fcdd89025d966d48eabef59913bf2
- https://git.kernel.org/stable/c/3c74b5787caf59bb1e9c5fe0a360643a71eb1e8a
- https://git.kernel.org/stable/c/3e4c56cf41876ef2a82f0877fe2a67648f8632b8
- https://git.kernel.org/stable/c/de4b679aa3b4da7ec34f639df068b914f20e3c3c
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.80