Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: shaper: protect late read accesses to the hierarchy We look up a netdev during prep of Netlink ops (pre- callbacks) and take a ref to it. Then later in the body of the callback we take its lock or RCU which are the actual protections. This is not proper, a conversion from a ref to a locked netdev must include a liveness check (a check if the netdev hasn't been unregistered already). Fix the read cases (those under RCU). Writes needs a separate change to protect from creating the hierarchy after flush has already run.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.13.1, < 6.18.20 |
References
- https://git.kernel.org/stable/c/0f9ea7141f365b4f27226898e62220fb98ef8dc6Patch
- https://git.kernel.org/stable/c/348758ba74e6a348299965b16a97cfb817545cc0Patch
- https://git.kernel.org/stable/c/581eee0890a8bde44f1fb78ad3e70502a897d583Patch
FAQ
What is CVE-2026-23437?
CVE-2026-23437 is a vulnerability with a CVSS score of 7.8 (HIGH). In the Linux kernel, the following vulnerability has been resolved: net: shaper: protect late read accesses to the hierarchy We look up a netdev during prep of Netlink ops (pre- callbacks) and take ...
How severe is CVE-2026-23437?
CVE-2026-23437 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-23437?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.