Improper locking in Linux kernel - CVE-2021-47128
Published: June 3, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90799
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2021-47128
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper locking within the bpf_probe_read_kernel_common(), bpf_probe_read_kernel_str_common() and bpf_tracing_func_proto() functions in kernel/trace/bpf_trace.c, within the bpf_base_func_proto() function in kernel/bpf/helpers.c. A local user can perform a denial of service (DoS) attack.
Affected software
Linux kernel
How to mitigate CVE-2021-47128
Install update from vendor's website.
Linux kernel - addressed in versions 5.10.43, 5.12.10, 5.13
External References
- https://git.kernel.org/stable/c/ff5039ec75c83d2ed5b781dc7733420ee8c985fc
- https://git.kernel.org/stable/c/acc43fc6cf0d50612193813c5906a1ab9d433e1e
- https://git.kernel.org/stable/c/ff40e51043af63715ab413995ff46996ecf9583f
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.43
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.10
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13