{"api_version":"1","generated_at":"2026-06-03T18:17:06+00:00","cve":"CVE-2026-43491","urls":{"html":"https://cve.report/CVE-2026-43491","api":"https://cve.report/api/cve/CVE-2026-43491.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-43491","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-43491"},"summary":{"title":"net: qrtr: ns: Limit the maximum server registration per node","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: qrtr: ns: Limit the maximum server registration per node\n\nCurrent code does no bound checking on the number of servers added per\nnode. A malicious client can flood NEW_SERVER messages and exhaust memory.\n\nFix this issue by limiting the maximum number of server registrations to\n256 per node. If the NEW_SERVER message is received for an old port, then\ndon't restrict it as it will get replaced. While at it, also rate limit\nthe error messages in the failure path of qrtr_ns_worker().\n\nNote that the limit of 256 is chosen based on the current platform\nrequirements. If requirement changes in the future, this limit can be\nincreased.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-19 12:16:18","updated_at":"2026-05-19 12:16:18"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/3efaad55cad1ded429e3a873bfece389058a526b","name":"https://git.kernel.org/stable/c/3efaad55cad1ded429e3a873bfece389058a526b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/868202aa2adae427060a42d5bd663b4d782ec02c","name":"https://git.kernel.org/stable/c/868202aa2adae427060a42d5bd663b4d782ec02c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e6f6cd501fb54060940a6eb3f4103eeb5e426ae7","name":"https://git.kernel.org/stable/c/e6f6cd501fb54060940a6eb3f4103eeb5e426ae7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d5ee2ff98322337951c56398e79d51815acbf955","name":"https://git.kernel.org/stable/c/d5ee2ff98322337951c56398e79d51815acbf955","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/35fb4a0c077c5d1049c2628b769e0a1b1e65df0d","name":"https://git.kernel.org/stable/c/35fb4a0c077c5d1049c2628b769e0a1b1e65df0d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-43491","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43491","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0c2204a4ad710d95d348ea006f14ba926e842ffd e6f6cd501fb54060940a6eb3f4103eeb5e426ae7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0c2204a4ad710d95d348ea006f14ba926e842ffd 3efaad55cad1ded429e3a873bfece389058a526b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0c2204a4ad710d95d348ea006f14ba926e842ffd 35fb4a0c077c5d1049c2628b769e0a1b1e65df0d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0c2204a4ad710d95d348ea006f14ba926e842ffd 868202aa2adae427060a42d5bd663b4d782ec02c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0c2204a4ad710d95d348ea006f14ba926e842ffd d5ee2ff98322337951c56398e79d51815acbf955 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.7","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.7 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.140 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.86 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.27 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.4 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"43491","cve":"CVE-2026-43491","epss":"0.000240000","percentile":"0.070660000","score_date":"2026-05-28","updated_at":"2026-05-29 00:13:16"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/qrtr/ns.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"e6f6cd501fb54060940a6eb3f4103eeb5e426ae7","status":"affected","version":"0c2204a4ad710d95d348ea006f14ba926e842ffd","versionType":"git"},{"lessThan":"3efaad55cad1ded429e3a873bfece389058a526b","status":"affected","version":"0c2204a4ad710d95d348ea006f14ba926e842ffd","versionType":"git"},{"lessThan":"35fb4a0c077c5d1049c2628b769e0a1b1e65df0d","status":"affected","version":"0c2204a4ad710d95d348ea006f14ba926e842ffd","versionType":"git"},{"lessThan":"868202aa2adae427060a42d5bd663b4d782ec02c","status":"affected","version":"0c2204a4ad710d95d348ea006f14ba926e842ffd","versionType":"git"},{"lessThan":"d5ee2ff98322337951c56398e79d51815acbf955","status":"affected","version":"0c2204a4ad710d95d348ea006f14ba926e842ffd","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/qrtr/ns.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.7"},{"lessThan":"5.7","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.140","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.86","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.27","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.140","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.86","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.27","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.4","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1-rc1","versionStartIncluding":"5.7","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: qrtr: ns: Limit the maximum server registration per node\n\nCurrent code does no bound checking on the number of servers added per\nnode. A malicious client can flood NEW_SERVER messages and exhaust memory.\n\nFix this issue by limiting the maximum number of server registrations to\n256 per node. If the NEW_SERVER message is received for an old port, then\ndon't restrict it as it will get replaced. While at it, also rate limit\nthe error messages in the failure path of qrtr_ns_worker().\n\nNote that the limit of 256 is chosen based on the current platform\nrequirements. If requirement changes in the future, this limit can be\nincreased."}],"providerMetadata":{"dateUpdated":"2026-05-19T10:44:23.832Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/e6f6cd501fb54060940a6eb3f4103eeb5e426ae7"},{"url":"https://git.kernel.org/stable/c/3efaad55cad1ded429e3a873bfece389058a526b"},{"url":"https://git.kernel.org/stable/c/35fb4a0c077c5d1049c2628b769e0a1b1e65df0d"},{"url":"https://git.kernel.org/stable/c/868202aa2adae427060a42d5bd663b4d782ec02c"},{"url":"https://git.kernel.org/stable/c/d5ee2ff98322337951c56398e79d51815acbf955"}],"title":"net: qrtr: ns: Limit the maximum server registration per node","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-43491","datePublished":"2026-05-19T10:44:23.832Z","dateReserved":"2026-05-01T14:12:56.013Z","dateUpdated":"2026-05-19T10:44:23.832Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-19 12:16:18","lastModifiedDate":"2026-05-19 12:16:18","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"43491","Ordinal":"1","Title":"net: qrtr: ns: Limit the maximum server registration per node","CVE":"CVE-2026-43491","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"43491","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: qrtr: ns: Limit the maximum server registration per node\n\nCurrent code does no bound checking on the number of servers added per\nnode. A malicious client can flood NEW_SERVER messages and exhaust memory.\n\nFix this issue by limiting the maximum number of server registrations to\n256 per node. If the NEW_SERVER message is received for an old port, then\ndon't restrict it as it will get replaced. While at it, also rate limit\nthe error messages in the failure path of qrtr_ns_worker().\n\nNote that the limit of 256 is chosen based on the current platform\nrequirements. If requirement changes in the future, this limit can be\nincreased.","Type":"Description","Title":"net: qrtr: ns: Limit the maximum server registration per node"}]}}}