SB20260815125 - Heap-based buffer overflow in Linux kernel ath wcn36xx driver
Published: August 15, 2026
Security Bulletin ID
SB20260815125
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) Heap-based buffer overflow (CVE-ID: CVE-2026-74341)
CWE-ID: CWE-122 - Heap-based Buffer Overflow
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 user to cause a denial of service.
The vulnerability exists due to a heap-based buffer overflow in the wcn36xx HAL response dispatcher when processing an oversized firmware HAL response. A local user can provide a firmware response with an excessive length to cause a denial of service.
The copied data is firmware-controlled content written into a 4096-byte buffer.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/15545ee71301e82d26d9a31b407ed0019eb62a60
- https://git.kernel.org/stable/c/18813b90032bfaafb225906a4d2b51be4dfc02c3
- https://git.kernel.org/stable/c/1b5d8a248c3afa640bcc99fa95abcd1e36f3ee18
- https://git.kernel.org/stable/c/88a240d86d3d64521f9194abe185ac71cc74d0bd
- https://git.kernel.org/stable/c/cfc67aee0c83e7f5d43a1dad3e25c789e9cc1d92
- https://git.kernel.org/stable/c/dae9cadf0925f1cbfb71306d60490890df3870a6