CVE-2026-43491

net: qrtr: ns: Limit the maximum server registration per node

State: Published
Severity: Not scored
Published: May 19, 2026
Updated: Aug 19, 2026
Reserved: May 1, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	0c2204a4ad710d95d348ea006f14ba926e842ffd to before b48fc702b20233b809f01053232c3cd5083c97b4Affected 0c2204a4ad710d95d348ea006f14ba926e842ffd to before 991c431077b19176d3fe3bb54054c063776a8cdcAffected 0c2204a4ad710d95d348ea006f14ba926e842ffd to before 94914731ca0b99899dceadd80d2df00584a688caAffected 0c2204a4ad710d95d348ea006f14ba926e842ffd to before e6f6cd501fb54060940a6eb3f4103eeb5e426ae7Affected 0c2204a4ad710d95d348ea006f14ba926e842ffd to before 3efaad55cad1ded429e3a873bfece389058a526bAffected 0c2204a4ad710d95d348ea006f14ba926e842ffd to before 35fb4a0c077c5d1049c2628b769e0a1b1e65df0dAffected 0c2204a4ad710d95d348ea006f14ba926e842ffd to before 868202aa2adae427060a42d5bd663b4d782ec02cAffected 0c2204a4ad710d95d348ea006f14ba926e842ffd to before d5ee2ff98322337951c56398e79d51815acbf955Affected
LinuxLinux	5.7Affected before 5.7Not affected 5.10.265 through 5.10.Not affected 5.15.216 through 5.15.Not affected 6.1.183 through 6.1.Not affected 6.6.140 through 6.6.Not affected 6.12.86 through 6.12.Not affected 6.18.27 through 6.18.Not affected 7.0.4 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

0c2204a4ad710d95d348ea006f14ba926e842ffd to before b48fc702b20233b809f01053232c3cd5083c97b4Affected
0c2204a4ad710d95d348ea006f14ba926e842ffd to before 991c431077b19176d3fe3bb54054c063776a8cdcAffected
0c2204a4ad710d95d348ea006f14ba926e842ffd to before 94914731ca0b99899dceadd80d2df00584a688caAffected
0c2204a4ad710d95d348ea006f14ba926e842ffd to before e6f6cd501fb54060940a6eb3f4103eeb5e426ae7Affected
0c2204a4ad710d95d348ea006f14ba926e842ffd to before 3efaad55cad1ded429e3a873bfece389058a526bAffected
0c2204a4ad710d95d348ea006f14ba926e842ffd to before 35fb4a0c077c5d1049c2628b769e0a1b1e65df0dAffected
0c2204a4ad710d95d348ea006f14ba926e842ffd to before 868202aa2adae427060a42d5bd663b4d782ec02cAffected
0c2204a4ad710d95d348ea006f14ba926e842ffd to before d5ee2ff98322337951c56398e79d51815acbf955Affected

LinuxLinux

5.7Affected
before 5.7Not affected
5.10.265 through 5.10.*Not affected
5.15.216 through 5.15.*Not affected
6.1.183 through 6.1.*Not affected
6.6.140 through 6.6.*Not affected
6.12.86 through 6.12.*Not affected
6.18.27 through 6.18.*Not affected
7.0.4 through 7.0.*Not affected
7.1 and laterNot affected

References

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