Integer underflow in Linux kernel - CVE-2026-64573
Published: August 6, 2026
Vulnerability identifier: #VU141034
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-64573
CWE-ID: CWE-191
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds read and out-of-bounds write in the qca_tlv_check_data() TLV parser when parsing a crafted firmware TLV with an undersized NVM tag length. A local user can supply a specially crafted firmware image to trigger out-of-bounds access and cause a denial of service.
The issue is caused by an integer underflow in the loop bound calculation for TLV_TYPE_NVM records.
Affected software
Linux kernel
How to mitigate CVE-2026-64573
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/4fcfb5b2c736785464ff9745f94c6726c5ee2d85
- https://git.kernel.org/stable/c/59fd2f075bca94f030c7c78e94878ea0803d7690
- https://git.kernel.org/stable/c/70354dbb5f72d9a76da7b031de3cbaf6c7d8fc24
- https://git.kernel.org/stable/c/a087ed960fce54e9302796229e9d545bbc9bcd4a
- https://git.kernel.org/stable/c/c90164ca0f7036942ba088eb7ea8d3f6c2352020