{"id":"CVE-2026-74346","title":"RDMA/irdma: Fix OOB read during CQ MR registration","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/irdma: Fix OOB read during CQ MR registration\n\nSashiko pointed out an unrelated bug during a previous patch:\nhttps://sashiko.dev/#/patchset/20260512183852.614045-1…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < a80b3b13786e9ab1c52b31a1f16c7d6708fa9220","Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < 3159c6fac43dc24b34d31971884d98a7a1bf4c4b","Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < ad360a31092a870633ec255b96f50181628b4de0","Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < d566002de555b18cc395012c5c1cb8682fc6d2a9","Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < 54cab78df0375196aaec4e3109191653d21751df","Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < d5aa82da8f65562da996d184686db9d0ea718b91","Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < 4385ddd654d90245eeb83b3cb539670ab5c85ba4","Linux 5.14"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:56:22.704059Z"},"published":"2026-08-15","updated":"2026-11-06","sourceUpdated":"2026-11-06T17:05:44.518Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74346","references":[{"url":"https://git.kernel.org/stable/c/a80b3b13786e9ab1c52b31a1f16c7d6708fa9220"},{"url":"https://git.kernel.org/stable/c/3159c6fac43dc24b34d31971884d98a7a1bf4c4b"},{"url":"https://git.kernel.org/stable/c/ad360a31092a870633ec255b96f50181628b4de0"},{"url":"https://git.kernel.org/stable/c/d566002de555b18cc395012c5c1cb8682fc6d2a9"},{"url":"https://git.kernel.org/stable/c/54cab78df0375196aaec4e3109191653d21751df"},{"url":"https://git.kernel.org/stable/c/d5aa82da8f65562da996d184686db9d0ea718b91"},{"url":"https://git.kernel.org/stable/c/4385ddd654d90245eeb83b3cb539670ab5c85ba4"}],"tags":["cve.org"],"epss":0.00173,"epssPercentile":0.06704,"ingestedAt":"2026-11-06T18:00:12.562Z","slug":"CVE-2026-74346","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/irdma: Fix OOB read during CQ MR registration\n\nSashiko pointed out an unrelated bug during a previous patch:\nhttps://sashiko.dev/#/patchset/20260512183852.614045-1-jmoroni%40google.com\n\nThis change fixes the bug by eliminating the cqmr->split field which\nwas not being set properly and instead just checks the CQ resize\nfeature flag directly.\n\nThe cqmr->split field essentially tracks whether IRDMA_FEATURE_CQ_RESIZE\nis set, but it was not being set until CQ creation time, which is _after_\nCQ memory registration (the only other place where it is referenced).\n\nAs a result, it would always be false during MR registration and would\ntherefore cause irdma_handle_q_mem to populate cqmr->shadow even for GEN_2\nHW and beyond:\n\n    cqmr->shadow = (dma_addr_t)arr[req->cq_pages];\n\nThe issue is that for GEN_2 and beyond, req->cq_pages may be exactly equal\nto iwmr->page_cnt and therefore equal to the size of arr, which would cause\nan OOB read by one.\n\n## Affected\n\n- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < a80b3b13786e9ab1c52b31a1f16c7d6708fa9220`\n- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < 3159c6fac43dc24b34d31971884d98a7a1bf4c4b`\n- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < ad360a31092a870633ec255b96f50181628b4de0`\n- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < d566002de555b18cc395012c5c1cb8682fc6d2a9`\n- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < 54cab78df0375196aaec4e3109191653d21751df`\n- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < d5aa82da8f65562da996d184686db9d0ea718b91`\n- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < 4385ddd654d90245eeb83b3cb539670ab5c85ba4`\n- `Linux 5.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}