Out-of-bounds write in Linux kernel - CVE-2026-90398
Published: September 18, 2026
Vulnerability identifier: #VU151078
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90398
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to write beyond an allocated buffer.
The vulnerability exists due to an allocation size and pointer stride mismatch in ath11k_wmi_tlv_mac_phy_caps_parse() when processing short firmware TLVs. A local user can cause the kernel to process short firmware TLVs to write beyond an allocated buffer.
Affected software
Linux kernel
How to mitigate CVE-2026-90398
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3