Out-of-bounds read in Linux kernel - CVE-2025-21692
Published: February 10, 2025 / Updated: September 17, 2025
Vulnerability identifier: #VU103743
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:U/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear
CVE-ID: CVE-2025-21692
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
Public exploit is 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 an out-of-bounds read error within the ets_class_from_arg() function in net/sched/sch_ets.c. A local user can perform a denial of service (DoS) attack.
How to mitigate CVE-2025-21692
Install update from vendor's website.
Sources
- https://git.kernel.org/stable/c/03c56665dab1f4ac844bc156652d50d639093fa5
- https://git.kernel.org/stable/c/1332c6ed446be787f901ed1064ec6a3c694f028a
- https://git.kernel.org/stable/c/997f6ec4208b23c87daf9f044689685f091826f7
- https://git.kernel.org/stable/c/bcf0d815e728a3a304b50455b32a3170c16e1eaa
- https://git.kernel.org/stable/c/d62b04fca4340a0d468d7853bd66e511935a18cb
- https://git.kernel.org/stable/c/f4168299e553f17aa2ba4016e77a9c38da40eb1d
- https://git.kernel.org/stable/c/f6b0f05fbfa4044f890e8a348288c0d9a20bd1d0
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.1