SB20250226319 - Use-after-free in Linux kernel mtd ubi driver
Published: February 26, 2025 Updated: May 11, 2025
Security Bulletin ID
SB20250226319
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-2021-47634)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the vol_attribute_show() function in drivers/mtd/ubi/vmt.c, within the dev_attribute_show(), ubi_attach_mtd_dev() and uif_close() functions in drivers/mtd/ubi/build.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/1a3f1cf87054833242fcd0218de0481cf855f888
- https://git.kernel.org/stable/c/3cbf0e392f173ba0ce425968c8374a6aa3e90f2e
- https://git.kernel.org/stable/c/432b057f8e847ae5a2306515606f8d2defaca178
- https://git.kernel.org/stable/c/5f9e9c223e48c264241d2f34d0bfc29e5fcb5c1b
- https://git.kernel.org/stable/c/a8ecee49259f8f78d91ddb329ab2be7e6fd01974
- https://git.kernel.org/stable/c/c32fe764191b8ae8b128588beb96e3718d9179d8
- https://git.kernel.org/stable/c/d727fd32cbd1abf3465f607021bc9c746f17b5a8
- https://git.kernel.org/stable/c/f149b1bd213820363731aa119e5011ca892a2aac
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.276