CVE-2026-43491
Description
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.
How to fix
- linux linux_kernel6.6.140, 6.12.86, 6.18.27, 7.0.4 or later
- git.kernel.org/stable/c/35fb4a0c077c5d1049c2628b769e0a1b1e65df0d
- git.kernel.org/stable/c/3efaad55cad1ded429e3a873bfece389058a526b
- git.kernel.org/stable/c/868202aa2adae427060a42d5bd663b4d782ec02c
- git.kernel.org/stable/c/d5ee2ff98322337951c56398e79d51815acbf955
- git.kernel.org/stable/c/e6f6cd501fb54060940a6eb3f4103eeb5e426ae7
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 5.7 ≤ v < 6.6.140, 6.7 ≤ v < 6.12.86, 6.13 ≤ v < 6.18.27, 6.19 ≤ v < 7.0.4 | 6.6.140, 6.12.86, 6.18.27, 7.0.4 |
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