{"id":"CVE-2026-68425","title":"IB/mad: Drop unmatched RMPP responses before reassembly","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nIB/mad: Drop unmatched RMPP responses before reassembly\n\nKernel-handled RMPP receive processing starts reassembly for active\nDATA responses before the response is match…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= fa619a77046bef30478697aba0553991033afb8e < 45416c87ebcece1e90f3bc5bc172d106b77c6b69","Linux >= fa619a77046bef30478697aba0553991033afb8e < 9634fb1f4d404f36a20ffbcb8797369db69b06bb","Linux >= fa619a77046bef30478697aba0553991033afb8e < bfb9e8243fd2099d1080d09222964d988f991d9b","Linux >= fa619a77046bef30478697aba0553991033afb8e < dfa535c94406c03d3f0c869ef3ba5528e395737c","Linux >= fa619a77046bef30478697aba0553991033afb8e < 6e1bd7f590b0ccfee07f7fe1d48b92059bd37d72","Linux >= fa619a77046bef30478697aba0553991033afb8e < 98d2d468b4faa1fdc68c0c6c238389906ee3490c","Linux >= fa619a77046bef30478697aba0553991033afb8e < ad9c9ad3204f63a46f0f7de29687a8e512f05e29","Linux >= fa619a77046bef30478697aba0553991033afb8e < d2e52d610b9b09694261632340b801a421e0b0c5","Linux 2.6.13"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-16T15:48:42.836474Z"},"published":"2026-08-10","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:53:12.923Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68425","references":[{"url":"https://git.kernel.org/stable/c/45416c87ebcece1e90f3bc5bc172d106b77c6b69"},{"url":"https://git.kernel.org/stable/c/9634fb1f4d404f36a20ffbcb8797369db69b06bb"},{"url":"https://git.kernel.org/stable/c/bfb9e8243fd2099d1080d09222964d988f991d9b"},{"url":"https://git.kernel.org/stable/c/dfa535c94406c03d3f0c869ef3ba5528e395737c"},{"url":"https://git.kernel.org/stable/c/6e1bd7f590b0ccfee07f7fe1d48b92059bd37d72"},{"url":"https://git.kernel.org/stable/c/98d2d468b4faa1fdc68c0c6c238389906ee3490c"},{"url":"https://git.kernel.org/stable/c/ad9c9ad3204f63a46f0f7de29687a8e512f05e29"},{"url":"https://git.kernel.org/stable/c/d2e52d610b9b09694261632340b801a421e0b0c5"}],"tags":["cve.org"],"epss":0.0026,"epssPercentile":0.16516,"ingestedAt":"2026-10-16T17:24:46.867Z","slug":"CVE-2026-68425","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nIB/mad: Drop unmatched RMPP responses before reassembly\n\nKernel-handled RMPP receive processing starts reassembly for active\nDATA responses before the response is matched to an outstanding send.\nThe normal match happens later, after ib_process_rmpp_recv_wc() has\neither assembled a complete message or consumed the segment.\n\nThat ordering lets an unsolicited response that routes to a kernel\nRMPP agent by the high TID bits allocate or extend RMPP receive state\nbefore the full TID and source address are checked against a real\nrequest. A reordered burst can therefore reach the receive-side\ninsertion path even though the response would not match any send.\n\nFor kernel-handled RMPP DATA responses, require the existing\nib_find_send_mad() match before entering RMPP reassembly. The matcher\nalready checks the full TID, management class and source address/GID\nagainst the agent wait, backlog and in-flight send lists. If there is\nno match, drop the response without creating RMPP state.\n\nThis leaves the RMPP window behavior unchanged and only rejects\nresponses that have no corresponding request.\n\n## Affected\n\n- `Linux >= fa619a77046bef30478697aba0553991033afb8e < 45416c87ebcece1e90f3bc5bc172d106b77c6b69`\n- `Linux >= fa619a77046bef30478697aba0553991033afb8e < 9634fb1f4d404f36a20ffbcb8797369db69b06bb`\n- `Linux >= fa619a77046bef30478697aba0553991033afb8e < bfb9e8243fd2099d1080d09222964d988f991d9b`\n- `Linux >= fa619a77046bef30478697aba0553991033afb8e < dfa535c94406c03d3f0c869ef3ba5528e395737c`\n- `Linux >= fa619a77046bef30478697aba0553991033afb8e < 6e1bd7f590b0ccfee07f7fe1d48b92059bd37d72`\n- `Linux >= fa619a77046bef30478697aba0553991033afb8e < 98d2d468b4faa1fdc68c0c6c238389906ee3490c`\n- `Linux >= fa619a77046bef30478697aba0553991033afb8e < ad9c9ad3204f63a46f0f7de29687a8e512f05e29`\n- `Linux >= fa619a77046bef30478697aba0553991033afb8e < d2e52d610b9b09694261632340b801a421e0b0c5`\n- `Linux 2.6.13`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}