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

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Summary

CVECVE-2026-43491
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-19 12:16:18 UTC
Updated2026-05-19 12:16:18 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.000240000 probability, percentile 0.070660000 (date 2026-05-28)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0c2204a4ad710d95d348ea006f14ba926e842ffd e6f6cd501fb54060940a6eb3f4103eeb5e426ae7 git Not specified
CNA Linux Linux affected 0c2204a4ad710d95d348ea006f14ba926e842ffd 3efaad55cad1ded429e3a873bfece389058a526b git Not specified
CNA Linux Linux affected 0c2204a4ad710d95d348ea006f14ba926e842ffd 35fb4a0c077c5d1049c2628b769e0a1b1e65df0d git Not specified
CNA Linux Linux affected 0c2204a4ad710d95d348ea006f14ba926e842ffd 868202aa2adae427060a42d5bd663b4d782ec02c git Not specified
CNA Linux Linux affected 0c2204a4ad710d95d348ea006f14ba926e842ffd d5ee2ff98322337951c56398e79d51815acbf955 git Not specified
CNA Linux Linux affected 5.7 Not specified
CNA Linux Linux unaffected 5.7 semver Not specified
CNA Linux Linux unaffected 6.6.140 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.86 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.27 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.4 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3efaad55cad1ded429e3a873bfece389058a526b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/868202aa2adae427060a42d5bd663b4d782ec02c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e6f6cd501fb54060940a6eb3f4103eeb5e426ae7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d5ee2ff98322337951c56398e79d51815acbf955 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/35fb4a0c077c5d1049c2628b769e0a1b1e65df0d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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