SB2021051501 - Privilege escalation in Linux kernel block subsystem
Published: May 15, 2021 Updated: November 22, 2023
Security Bulletin ID
SB2021051501
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-2019-25044)
The vulnerability allows a local authenticated user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the block subsystem. 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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c3e2219216c92919a6bd1711f340f5faa98695e6
- https://syzkaller.appspot.com/bug?id=36fe241584203cf394d44560a42e3430434f1213
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.2
- https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-blk_mq_free_rqs
- https://security.netapp.com/advisory/ntap-20210629-0006/