SB2025040247 - Use-after-free in Linux kernel rcu
Published: April 2, 2025 Updated: May 11, 2025
Security Bulletin ID
SB2025040247
CSH 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 vulnerability.
1) Use-after-free (CVE-ID: CVE-2025-21983)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the call_rcu(), __schedule_delayed_monitor_work(), kvfree_rcu_queue_batch(), run_page_cache_worker() and kfree_rcu_batch_init() functions in kernel/rcu/tree.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/656e35bf66a11e1adde44c4c12050086dc39f241
- https://git.kernel.org/stable/c/a74979dce9e9c61f6d797c3761020252c4d8dc63
- https://git.kernel.org/stable/c/dfd3df31c9db752234d7d2e09bef2aeabb643ce4
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.20
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.8
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.14