CVE-2026-46003 net: qrtr: ns: Limit the total number of nodes
A malicious client can exhaust kernel memory by registering unlimited nodes in the QRTR nameserver, causing a denial of service.
- 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-2026-46003?
CVE-2026-46003 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 total number of nodes
Currently, the nameserver doesn't limit the number of nodes it handles. This can be an attack vector if a malicious client starts registering random nodes, leading to memory exhaustion.
Hence, limit the maximum number of nodes to 64. 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-2026-46003?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-46003?
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-2026-46003 being exploited?
There is no known exploitation of CVE-2026-46003 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-88611, BELL-CVE-2026-46003, DEBIAN-CVE-2026-46003, GHSA-23cv-jrm2-r83v, ROOT-OS-DEBIAN-11-CVE-2026-46003, ROOT-OS-DEBIAN-12-CVE-2026-46003 and 3 more.