SB2026050873 - Use-after-free in Linux kernel net caif driver
Published: May 8, 2026
Security Bulletin ID
SB2026050873
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-43458)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in the caif_serial line discipline TX path when calling tty_write_room(). A local user can trigger the vulnerable code path to cause a denial of service.
The issue is triggered by a reproducer that causes a KASAN slab-use-after-free in pty_write_room() on access to tty->link->port.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/23a3ac2e2262a291498567418227b99e1f3606b1
- https://git.kernel.org/stable/c/27e43356d0defb9fc7fa25265219a3ffeb7b3e98
- https://git.kernel.org/stable/c/288598d80a068a0e9281de35bcb4ce495f189e2a
- https://git.kernel.org/stable/c/35b58d3bc716ebb9ebd10fe1cac8c1177242511c
- https://git.kernel.org/stable/c/52135420e9f75853ea0c6cea7b736e3e98495f7d
- https://git.kernel.org/stable/c/8460187b4852fd00bd1c76394358053f3fa4d089
- https://git.kernel.org/stable/c/97a0bb491cae39478c6225381f14e9ac67b7bba7
- https://git.kernel.org/stable/c/ca2ceba983bb23ea0202c2882d963253416654a3