Improper input validation in Linux kernel - CVE-2026-72319
Published: August 16, 2026
Vulnerability identifier: #VU143127
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2026-72319
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in ip_vs_in_icmp in the IPVS subsystem when processing ICMP error packets from tunnels. A remote attacker can send a specially crafted ICMP error packet to cause a denial of service.
The issue involves inner IP headers not being ensured in skb headroom after outer headers are stripped, and additional length checks were required for the inner headers.
Affected software
Linux kernel
How to mitigate CVE-2026-72319
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/19657b3a17b774ae4e2f2635b5ae8638c9344a40
- https://git.kernel.org/stable/c/3f7a535ff0fa627a0132803e4c2f903ceffcbc1c
- https://git.kernel.org/stable/c/8f48cfe657409fb5c7ba0521b14da6d47546d9cf
- https://git.kernel.org/stable/c/92185d6f7819bc558939ae83de7b1abe90e3b5c2
- https://git.kernel.org/stable/c/9bc9b95aee2b2e3f1301a16a67ee504960402875
- https://git.kernel.org/stable/c/a735f9964a3d9ed97daf9b08507f8b5bcafe6326
- https://git.kernel.org/stable/c/dac813101914c21219ac221a60a31a11bc90e7ec
- https://git.kernel.org/stable/c/dd22f74a09e25ca298ced0a3763ef353242cb78d