Use-after-free in Linux kernel - CVE-2026-98381
Published: October 9, 2026
Vulnerability identifier: #VU154048
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2026-98381
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in the veth driver's XDP program handling when resizing receive channels and detaching or replacing an XDP program. A local user can reduce the receive channel count, detach or replace the XDP program, and subsequently increase the channel count to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-98381
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/1a5c5b9c64ba5f39dba55da6e12561ca56eeb758
- https://git.kernel.org/stable/c/25bb7c36225220d30f404d7e29d2e052bc5f4b99
- https://git.kernel.org/stable/c/3c10a5dd0d38f506f671dbb59e9d0ee4c72076f9
- https://git.kernel.org/stable/c/43f6b647f209591b1e3f726bb16b8dcba6b95908
- https://git.kernel.org/stable/c/7104a370714346b667712913dc16abf14bbc97ed
- https://git.kernel.org/stable/c/7a8e143109ff2736dc79e41dcd55af7ceab7520a
- https://git.kernel.org/stable/c/f0e8dba8c224981e53c792c6b3dbb7604fb2c2c6