Out-of-bounds read in Linux kernel - CVE-2026-64114
Published: July 20, 2026
Vulnerability identifier: #VU138530
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-64114
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 access in the raw_send_hdrinc IPv4 packet handling in the Linux kernel when processing a malformed IP_HDRINCL packet with an IPv4 header length value less than 5. A local user can send a specially crafted packet through a raw socket to cause a denial of service.
Exploitation requires CAP_NET_RAW. Triggering the reproduced crash path also requires a matching xfrm AH policy on the outgoing route, and loopback does not reach the affected path.
How to mitigate CVE-2026-64114
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/1065b9efa4126df559b03a849c139ecfae92cd25
- https://git.kernel.org/stable/c/145e9afa5b905229b4788bb72c3255f5a5f77508
- https://git.kernel.org/stable/c/3c5411fa4944ed99af3d9d1de750ea8169b6dac9
- https://git.kernel.org/stable/c/5a564f737ec54d63e8ee221d3ff396d07586d464
- https://git.kernel.org/stable/c/7725cd3b471740fd23d25ed1da722c671fb2a5d3
- https://git.kernel.org/stable/c/915fab69823a14c170dbaa3b41978768e0fe62fc
- https://git.kernel.org/stable/c/bbe0be67de296176e7243c76e3d9f02f6ae9ff0b
- https://git.kernel.org/stable/c/bc20dbd48c26e743f7e0845020c11ed2ce8b15ee