Out-of-bounds read in Linux kernel - CVE-2021-46954
Published: May 31, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90358
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-46954
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to read data or crash the application.
The vulnerability exists due to an out-of-bounds read error within the sch_fragment() function in net/sched/sch_frag.c. A local user can read data or crash the application.
Affected software
Linux kernel
How to mitigate CVE-2021-46954
Install update from vendor's website.
Linux kernel - addressed in versions 5.11.20, 5.12.3, 5.13
External References
- https://git.kernel.org/stable/c/018bb8da5b5888e19585f9b802f036afe643fcef
- https://git.kernel.org/stable/c/8e6dfb7beeb6489ac1365b8a71052e737f5da76e
- https://git.kernel.org/stable/c/31fe34a0118e0acc958c802e830ad5d37ef6b1d3
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.20
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.3
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13