Use-after-free in Linux kernel - CVE-2026-98320
Published: October 8, 2026
Vulnerability identifier: #VU153955
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98320
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to compromise confidentiality, integrity, and availability.
The vulnerability exists due to use-after-free in the netfilter flowtable component when the flowtable datapath accesses connection-tracking state after its reference has been released. A local user can access prematurely released connection-tracking state to compromise confidentiality, integrity, and availability.
RCU typesafe semantics also allow a flowtable datapath reference to resolve to the wrong connection-tracking object.
Affected software
Linux kernel
How to mitigate CVE-2026-98320
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/12c1ac230f4ca16e0017b62a963ab75e0b48074f
- https://git.kernel.org/stable/c/61c6688be282277c6e91ab286a7acd0ae8681ac6
- https://git.kernel.org/stable/c/8274cdc5f9c57e17ed77fc4ba76212536c840f25
- https://git.kernel.org/stable/c/93ff1594be1aad4da364462dd8db050ebcfda2de
- https://git.kernel.org/stable/c/a43cd2b67b91e943273c913237a7a88c50cdcfbc
- https://git.kernel.org/stable/c/d9e6175a3ee48209ee65f294fc567b4e16b29b74
- https://git.kernel.org/stable/c/e75a9fa1d44bcbd66ea02e8781bcca6ea4076e0d
- https://git.kernel.org/stable/c/eed6997e8dc40593a539fcc722e7ed51b18db86c