{"api_version":"1","generated_at":"2026-05-30T12:19:04+00:00","cve":"CVE-2026-46043","urls":{"html":"https://cve.report/CVE-2026-46043","api":"https://cve.report/api/cve/CVE-2026-46043.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-46043","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-46043"},"summary":{"title":"RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv\n\nrxe_rcv() currently checks only that the incoming packet is at least\nheader_size(pkt) bytes long before payload_size() is used.\n\nHowever, payload_size() subtracts both the attacker-controlled BTH pad\nfield and RXE_ICRC_SIZE from pkt->paylen:\n\n  payload_size = pkt->paylen - offset[RXE_PAYLOAD] - bth_pad(pkt)\n                 - RXE_ICRC_SIZE\n\nThis means a short packet can still make payload_size() underflow even\nif it includes enough bytes for the fixed headers. Simply requiring\nheader_size(pkt) + RXE_ICRC_SIZE is not sufficient either, because a\npacket with a forged non-zero BTH pad can still leave payload_size()\nnegative and pass an underflowed value to later receive-path users.\n\nFix this by validating pkt->paylen against the full minimum length\nrequired by payload_size(): header_size(pkt) + bth_pad(pkt) +\nRXE_ICRC_SIZE.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-27 14:17:23","updated_at":"2026-05-30 11:17:19"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"9.1","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","baseScore":9.1,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"9.1","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","data":{"baseScore":9.1,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/e8ee0e792d475b1067c199ef0af1b6221fa6f43d","name":"https://git.kernel.org/stable/c/e8ee0e792d475b1067c199ef0af1b6221fa6f43d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2fd4f8b749309a61c3f3f88ee8891d94f79e1240","name":"https://git.kernel.org/stable/c/2fd4f8b749309a61c3f3f88ee8891d94f79e1240","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9b924f3a26b21330a837cfe72e819b6393bbeeaa","name":"https://git.kernel.org/stable/c/9b924f3a26b21330a837cfe72e819b6393bbeeaa","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7244491dab347f648e661da96dc0febadd9daec3","name":"https://git.kernel.org/stable/c/7244491dab347f648e661da96dc0febadd9daec3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f83519a4c122c9c7a850a2197648a9ff4c67c520","name":"https://git.kernel.org/stable/c/f83519a4c122c9c7a850a2197648a9ff4c67c520","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-46043","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46043","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8700e3e7c4857d28ebaa824509934556da0b3e76 2fd4f8b749309a61c3f3f88ee8891d94f79e1240 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8700e3e7c4857d28ebaa824509934556da0b3e76 f83519a4c122c9c7a850a2197648a9ff4c67c520 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8700e3e7c4857d28ebaa824509934556da0b3e76 9b924f3a26b21330a837cfe72e819b6393bbeeaa git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8700e3e7c4857d28ebaa824509934556da0b3e76 e8ee0e792d475b1067c199ef0af1b6221fa6f43d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8700e3e7c4857d28ebaa824509934556da0b3e76 7244491dab347f648e661da96dc0febadd9daec3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.8","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.8 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":"46043","cve":"CVE-2026-46043","epss":"0.000180000","percentile":"0.051640000","score_date":"2026-05-29","updated_at":"2026-05-30 00:13:24"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/infiniband/sw/rxe/rxe_recv.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"2fd4f8b749309a61c3f3f88ee8891d94f79e1240","status":"affected","version":"8700e3e7c4857d28ebaa824509934556da0b3e76","versionType":"git"},{"lessThan":"f83519a4c122c9c7a850a2197648a9ff4c67c520","status":"affected","version":"8700e3e7c4857d28ebaa824509934556da0b3e76","versionType":"git"},{"lessThan":"9b924f3a26b21330a837cfe72e819b6393bbeeaa","status":"affected","version":"8700e3e7c4857d28ebaa824509934556da0b3e76","versionType":"git"},{"lessThan":"e8ee0e792d475b1067c199ef0af1b6221fa6f43d","status":"affected","version":"8700e3e7c4857d28ebaa824509934556da0b3e76","versionType":"git"},{"lessThan":"7244491dab347f648e661da96dc0febadd9daec3","status":"affected","version":"8700e3e7c4857d28ebaa824509934556da0b3e76","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/infiniband/sw/rxe/rxe_recv.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.8"},{"lessThan":"4.8","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":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.86","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.27","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.4","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1-rc1","versionStartIncluding":"4.8","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv\n\nrxe_rcv() currently checks only that the incoming packet is at least\nheader_size(pkt) bytes long before payload_size() is used.\n\nHowever, payload_size() subtracts both the attacker-controlled BTH pad\nfield and RXE_ICRC_SIZE from pkt->paylen:\n\n  payload_size = pkt->paylen - offset[RXE_PAYLOAD] - bth_pad(pkt)\n                 - RXE_ICRC_SIZE\n\nThis means a short packet can still make payload_size() underflow even\nif it includes enough bytes for the fixed headers. Simply requiring\nheader_size(pkt) + RXE_ICRC_SIZE is not sufficient either, because a\npacket with a forged non-zero BTH pad can still leave payload_size()\nnegative and pass an underflowed value to later receive-path users.\n\nFix this by validating pkt->paylen against the full minimum length\nrequired by payload_size(): header_size(pkt) + bth_pad(pkt) +\nRXE_ICRC_SIZE."}],"metrics":[{"cvssV3_1":{"baseScore":9.1,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-05-30T10:46:56.646Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/2fd4f8b749309a61c3f3f88ee8891d94f79e1240"},{"url":"https://git.kernel.org/stable/c/f83519a4c122c9c7a850a2197648a9ff4c67c520"},{"url":"https://git.kernel.org/stable/c/9b924f3a26b21330a837cfe72e819b6393bbeeaa"},{"url":"https://git.kernel.org/stable/c/e8ee0e792d475b1067c199ef0af1b6221fa6f43d"},{"url":"https://git.kernel.org/stable/c/7244491dab347f648e661da96dc0febadd9daec3"}],"title":"RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-46043","datePublished":"2026-05-27T12:56:57.987Z","dateReserved":"2026-05-13T15:03:33.094Z","dateUpdated":"2026-05-30T10:46:56.646Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-27 14:17:23","lastModifiedDate":"2026-05-30 11:17:19","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","baseScore":9.1,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.2}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"46043","Ordinal":"1","Title":"RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv","CVE":"CVE-2026-46043","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"46043","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv\n\nrxe_rcv() currently checks only that the incoming packet is at least\nheader_size(pkt) bytes long before payload_size() is used.\n\nHowever, payload_size() subtracts both the attacker-controlled BTH pad\nfield and RXE_ICRC_SIZE from pkt->paylen:\n\n  payload_size = pkt->paylen - offset[RXE_PAYLOAD] - bth_pad(pkt)\n                 - RXE_ICRC_SIZE\n\nThis means a short packet can still make payload_size() underflow even\nif it includes enough bytes for the fixed headers. Simply requiring\nheader_size(pkt) + RXE_ICRC_SIZE is not sufficient either, because a\npacket with a forged non-zero BTH pad can still leave payload_size()\nnegative and pass an underflowed value to later receive-path users.\n\nFix this by validating pkt->paylen against the full minimum length\nrequired by payload_size(): header_size(pkt) + bth_pad(pkt) +\nRXE_ICRC_SIZE.","Type":"Description","Title":"RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv"}]}}}