Use of Out-of-range Pointer Offset in Linux kernel - CVE-2026-63924
Published: July 20, 2026
Vulnerability identifier: #VU138729
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-63924
CWE-ID: CWE-823
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper pointer handling in the IPv6 extension header parser in net/ipv6/exthdrs.c when processing IPv6 jumbo hop-by-hop options. A remote attacker can send a specially crafted IPv6 packet to cause a denial of service.
How to mitigate CVE-2026-63924
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/2b56bbd928c030894c270cd33d60286326919458
- https://git.kernel.org/stable/c/645b99b1a185c91a79bdac4c5de0f91b212d64f0
- https://git.kernel.org/stable/c/72af7beae774e46ed543f3f2f267bf0a141bfcdd
- https://git.kernel.org/stable/c/9e883eaa878f4337b5873c706efb5a192364ed18
- https://git.kernel.org/stable/c/b3ac54e5c905f86d22b502eacb5686a282c5659f
- https://git.kernel.org/stable/c/bddaa4dfc7f36e1ee343a0622f69288af2b9ace9
- https://git.kernel.org/stable/c/c512e1c819dfbf6ae95ee7a44b65b9ad98979157
- https://git.kernel.org/stable/c/d47548a36639095939f4747d4c43f2271366f565