Reachable assertion in Linux kernel - CVE-2026-45847
Published: May 28, 2026
Vulnerability identifier: #VU132639
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-45847
CWE-ID: CWE-617
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 improper handling of an assertion in the forward path array when processing a sufficiently long forward path. A local user can configure networking state to build a sufficiently long forward path to cause a denial of service.
Recent support for IPIP tunnels increases the likelihood of reaching the vulnerable condition.
How to mitigate CVE-2026-45847
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/008e7a7c293b30bc43e4368dac6ea3808b75a572
- https://git.kernel.org/stable/c/50422613185d505201167e8bdd2f2700790d5db6
- https://git.kernel.org/stable/c/548244c2f542aa0ad49453e9306e715a3877bc44
- https://git.kernel.org/stable/c/9464ca7a6e56ad1ebf48b2ad5c16871edfad10c6
- https://git.kernel.org/stable/c/959ea349c7e2d4edf07b6838ca7e59345fe61a08
- https://git.kernel.org/stable/c/a78d055ba7c31103ad02f8eceb0c452e154d2660
- https://git.kernel.org/stable/c/dcf9b3c90e5560339649d088836529883fb509f3