SB2021060738 - Privilege escalation in Linux kernel io_uring
Published: June 7, 2021 Updated: November 22, 2023
Security Bulletin ID
SB2021060738
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-2020-36387)
The vulnerability allows a local authenticated user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within thefs/io_uring.c. A local authenticated user can trigger a use-after-free error and escalate privileges on the system.
Remediation
Install update from vendor's website.
References
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.2
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6d816e088c359866f9867057e04f244c608c42fe
- https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-io_async_task_func
- https://syzkaller.appspot.com/bug?id=ce5f07d6ec3b5050b8f0728a3b389aa510f2591b
- https://security.netapp.com/advisory/ntap-20210727-0006/