{"id":"CVE-2026-46043","title":"RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv","summary":"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 befor…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < c4376c672c3648d5bdc31dfffc329d07164f93c4","Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < 5fedefec757192dcaad29a664ac332c7601be144","Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < 2c0d71ef12f46c57d37bc571f3f2797db7eb50cc","Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < 2fd4f8b749309a61c3f3f88ee8891d94f79e1240","Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < f83519a4c122c9c7a850a2197648a9ff4c67c520","Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < 9b924f3a26b21330a837cfe72e819b6393bbeeaa","Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < e8ee0e792d475b1067c199ef0af1b6221fa6f43d","Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < 7244491dab347f648e661da96dc0febadd9daec3","Linux 4.8"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-16T15:19:11.752774Z"},"published":"2026-05-27","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:20:49.243Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-46043","references":[{"url":"https://git.kernel.org/stable/c/c4376c672c3648d5bdc31dfffc329d07164f93c4"},{"url":"https://git.kernel.org/stable/c/5fedefec757192dcaad29a664ac332c7601be144"},{"url":"https://git.kernel.org/stable/c/2c0d71ef12f46c57d37bc571f3f2797db7eb50cc"},{"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"}],"tags":["cve.org"],"epss":0.00514,"epssPercentile":0.4249,"ingestedAt":"2026-10-16T17:24:46.704Z","slug":"CVE-2026-46043","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < c4376c672c3648d5bdc31dfffc329d07164f93c4`\n- `Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < 5fedefec757192dcaad29a664ac332c7601be144`\n- `Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < 2c0d71ef12f46c57d37bc571f3f2797db7eb50cc`\n- `Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < 2fd4f8b749309a61c3f3f88ee8891d94f79e1240`\n- `Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < f83519a4c122c9c7a850a2197648a9ff4c67c520`\n- `Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < 9b924f3a26b21330a837cfe72e819b6393bbeeaa`\n- `Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < e8ee0e792d475b1067c199ef0af1b6221fa6f43d`\n- `Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < 7244491dab347f648e661da96dc0febadd9daec3`\n- `Linux 4.8`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}