SB20240531144 - Use-after-free in Linux kernel net
Published: May 31, 2024 Updated: May 14, 2025
Security Bulletin ID
SB20240531144
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-2021-47131)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the tls_ctx_create() function in net/tls/tls_main.c, within the tls_validate_xmit_skb() function in net/tls/tls_device_fallback.c, within the tls_device_gc_task(), tls_device_rx_resync_new_rec(), tls_device_decrypted() and tls_device_down() functions in net/tls/tls_device.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/f1d4184f128dede82a59a841658ed40d4e6d3aa2
- https://git.kernel.org/stable/c/0f1e6fe66977a864fe850522316f713d7b926fd9
- https://git.kernel.org/stable/c/c55dcdd435aa6c6ad6ccac0a4c636d010ee367a4
- 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