SB2024053130 - Use-after-free in Linux kernel x86 net
Published: May 31, 2024 Updated: May 14, 2025
Security Bulletin ID
SB2024053130
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Use-after-free (CVE-ID: CVE-2021-47303)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the jit_subprogs() function in kernel/bpf/verifier.c, within the bpf_prog_free_deferred() function in kernel/bpf/core.c, within the bpf_tail_call_direct_fixup() function in arch/x86/net/bpf_jit_comp.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/a9f36bf3613c65cb587c70fac655c775d911409b
- https://git.kernel.org/stable/c/599148d40366bd5d1d504a3a8fcd65e21107e500
- https://git.kernel.org/stable/c/f263a81451c12da5a342d90572e317e611846f2c
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.53
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.5
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14