Out-of-bounds read in Linux kernel - CVE-2026-63857
Published: July 20, 2026
Vulnerability identifier: #VU138798
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-63857
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in airoha_dev_xmit() when processing fragmented socket buffers. A local user can trigger transmission of a crafted fragmented packet to cause a denial of service.
The unsafe read occurs during the final loop iteration when the loop index reaches the fragment count, which may trigger a page fault.
How to mitigate CVE-2026-63857
Install security update from vendor's repository.