SB2026081557 - Out-of-bounds read in Linux kernel realtek rtw89 driver
Published: August 15, 2026
Security Bulletin ID
SB2026081557
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) Out-of-bounds read (CVE-ID: CVE-2026-74409)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 6.8 [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]
The vulnerability allows a local attacker to cause a denial of service.
The vulnerability exists due to out-of-bounds read in rtw89_assoc_link_rcu_dereference() when processing firmware-supplied mac_id values from RX descriptors. A local attacker can provide a crafted out-of-range mac_id value to cause a denial of service.
The mac_id field is 8 bits wide, while the assoc_link_on_macid array has only 128 entries.
Remediation
Install update from vendor's website.