CVE-2026-43491
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
In the Linux kernel, a vulnerability in net: qrtr: ns allowed unlimited server registration per node. A malicious client can flood NEW_SERVER messages, exhausting memory. Fixed by limiting server registrations to 256 per node and rate-limiting error messages.
Risk Assessment
An attacker can remotely exhaust system memory, leading to denial of service (DoS) for the entire system.
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit with a limit of 256 registrations per node).
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: net: qrtr: ns: Limit the maximum server registration per node Current code does no bound checking on the number of servers added per node. A malicious client can flood NEW_SERVER messages and exhaust memory. Fix this issue by limiting the maximum number of server registrations to 256 per node. If the NEW_SERVER message is received for an old port, then don't restrict it as it will get replaced. While at it, also rate limit the error messages in the failure path of qrtr_ns_worker(). Note that the limit of 256 is chosen based on the current platform requirements. If requirement changes in the future, this limit can be increased.