SB20261022362 - Use-after-free in Linux kernel tty driver
Published: October 22, 2026
Security Bulletin ID
SB20261022362
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-2026-98754)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to potentially cause a denial of service through a kernel crash.
The vulnerability exists due to a use-after-free in the Linux kernel vcc driver when terminal cleanup races with LDC callback processing. A local user can potentially trigger concurrent vcc_cleanup() and vcc_event() execution, causing a callback to dereference freed memory through tty->port and crash the kernel.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/03b49c991abb8d021ca6fe51cd173447236b0552
- https://git.kernel.org/stable/c/1a9fb9eaeb69b1f6c00bed09289a33d9fe1e7ae4
- https://git.kernel.org/stable/c/57753441ef84bee3bf0e9ee1e3778d119c44aa32
- https://git.kernel.org/stable/c/821050631750e982007c0856c119346edba51cae
- https://git.kernel.org/stable/c/88f6ecb058801e9ce7b9aabc966530118d7cd53c