SB20260928260 - Out-of-bounds write in Linux kernel stmicro stmmac driver
Published: September 28, 2026 Updated: September 30, 2026
Security Bulletin ID
SB20260928260
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds write (CVE-ID: CVE-2026-97953)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 8.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to corrupt the TX ring.
The vulnerability exists due to an out-of-bounds write in the stmmac_tso_xmit() TX descriptor availability check when processing highly fragmented TSO traffic. A remote attacker can trigger transmission of a highly fragmented TSO packet to corrupt the TX ring.
Remediation
Install update from vendor's website.