CVE-2026-43491

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux0c2204a4ad710d95d348ea006f14ba926e842ffd < e6f6cd501fb54060940a6eb3f4103eeb5e426ae7affected
LinuxLinux0c2204a4ad710d95d348ea006f14ba926e842ffd < 3efaad55cad1ded429e3a873bfece389058a526baffected
LinuxLinux0c2204a4ad710d95d348ea006f14ba926e842ffd < 35fb4a0c077c5d1049c2628b769e0a1b1e65df0daffected
LinuxLinux0c2204a4ad710d95d348ea006f14ba926e842ffd < 868202aa2adae427060a42d5bd663b4d782ec02caffected
LinuxLinux0c2204a4ad710d95d348ea006f14ba926e842ffd < d5ee2ff98322337951c56398e79d51815acbf955affected
LinuxLinux5.7affected
LinuxLinux0 < 5.7unaffected
LinuxLinux6.6.140 <= 6.6.*unaffected
LinuxLinux6.12.86 <= 6.12.*unaffected
LinuxLinux6.18.27 <= 6.18.*unaffected
LinuxLinux7.0.4 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References