CVE-2026-46026 net: qrtr: ns: Limit the maximum number of lookups
A malicious local client can exhaust kernel resources by flooding lookup messages, causing a denial of service in the Linux kernel QRTR nameserver.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-46026?
CVE-2026-46026 is a medium-severity denial of service vulnerability in Linux kernel, published on 27 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
net: qrtr: ns: Limit the maximum number of lookups
Current code does no bound checking on the number of lookups a client can perform. Though the code restricts the lookups to local clients, there is still a possibility of a malicious local client sending a flood of NEW_LOOKUP messages over the same socket.
Fix this issue by limiting the maximum number of lookups to 64 globally. Since the nameserver allows only atmost one local observer, this global lookup count will ensure that the lookups stay within the limit.
Note that, limit of 64 is chosen based on the current platform requirements. If requirement changes in the future, this limit can be increased.
Which versions are affected by CVE-2026-46026?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-46026?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-46026 being exploited?
There is no known exploitation of CVE-2026-46026 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-88605, BELL-CVE-2026-46026, DEBIAN-CVE-2026-46026, GHSA-5wpx-pvcm-rf34, ROOT-OS-DEBIAN-11-CVE-2026-46026, ROOT-OS-DEBIAN-12-CVE-2026-46026 and 3 more.