Race condition in Linux kernel - CVE-2026-98300
Published: October 7, 2026
Vulnerability identifier: #VU153727
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98300
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to trigger a kernel warning.
The vulnerability exists due to a race condition in tcp_v6_do_rcv() when processing incoming IPv6 TCP packets concurrently with closure of a listening socket. A local user can close a listening socket during the race window between tcp_v6_rcv() and tcp_v6_do_rcv() to trigger a kernel warning.
The affected path requires IPv6 receive options to be enabled through np->rxopt.all.
Affected software
Linux kernel
How to mitigate CVE-2026-98300
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/1cb7f292a337fdc72a8219bcd9d40a9cf5e86db5
- https://git.kernel.org/stable/c/3e3394a13b603cc79b6a35480b8e20df6c716944
- https://git.kernel.org/stable/c/56d38839ef0bff6526d9bd73b6811bd00316b21c
- https://git.kernel.org/stable/c/619bfbaacbff6a9822923f69f6af29d7f66a870c
- https://git.kernel.org/stable/c/7d94602e77a4525611afebb23149145ac242afd7
- https://git.kernel.org/stable/c/8e759cd1f6444a946bd1fd2b2b29eea582eea1d5
- https://git.kernel.org/stable/c/a23a3bc5004df6434de05797e0b6b2ecf864b86a
- https://git.kernel.org/stable/c/b727e3d58cb906f1506c1334dfba71fbb1338339