NULL pointer dereference in Linux kernel - CVE-2025-21857
Published: March 12, 2025 / Updated: May 11, 2025
Vulnerability identifier: #VU105666
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2025-21857
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2025-21857
Install update from vendor's website.
Sources
- 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