SB20260919156 - Use-after-free in Linux kernel net slip driver
Published: September 19, 2026
Security Bulletin ID
SB20260919156
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-90057)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to trigger a use-after-free read.
The vulnerability exists due to use-after-free in slip_receive_buf() when racing SLIP receive processing against TTY hangup. A local user can trigger concurrent receive processing and TTY hangup to trigger a use-after-free read.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/23c53269f2baaedf2d92784290cb9ef6db2a3bce
- https://git.kernel.org/stable/c/9a3b1edff1ecb47d323f2506b3ffc22178acd1c6
- https://git.kernel.org/stable/c/a2dbac3fb03b4427ccf057debc83fc61ee102529
- https://git.kernel.org/stable/c/a540a49fcca59d1c92c3a6462e67ca21676a88df
- https://git.kernel.org/stable/c/ddbc5dc5a2e29b3934da09c1ba3c930fd8a40fd6
- https://git.kernel.org/stable/c/de1f978c0f6ab42b28192d74dc59af52fdc76135