SB20240530155 - Use-after-free in Linux kernel fs
Published: May 30, 2024 Updated: May 14, 2025
Security Bulletin ID
SB20240530155
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-2021-47505)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the POLLFREE() function in include/uapi/asm-generic/poll.h, within the aio_poll(), aio_poll_complete_work(), aio_poll_cancel(), aio_poll_wake() and aio_poll_queue_proc() functions in fs/aio.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/321fba81ec034f88aea4898993c1bf15605c023f
- https://git.kernel.org/stable/c/4105e6a128e8a98455dfc9e6dbb2ab0c33c4497f
- https://git.kernel.org/stable/c/47ffefd88abfffe8a040bcc1dd0554d4ea6f7689
- https://git.kernel.org/stable/c/60d311f9e6381d779d7d53371f87285698ecee24
- https://git.kernel.org/stable/c/50252e4b5e989ce64555c7aef7516bdefc2fea72
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.221
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.85
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.8
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.165