{"id":"CVE-2026-74390","title":"RDMA/irdma: Fix out-of-bounds write in irdma_copy_user_pgaddrs","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/irdma: Fix out-of-bounds write in irdma_copy_user_pgaddrs\n\nThe irdma_copy_user_pgaddrs function loops through all of the umem DMA\nblocks to populate the PBLEs and …","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < 4780f58672ee6328accd54a95f9c00683477e499","Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < 79a20a8e201a779224b4bf115250a7713bde72c0","Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < 9f8f0d2099e3de1194e37dc933ae0c4206b09aaf","Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < 192a3be0e3759daa24af2841208b074ca6dbaabc","Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < 424d51d33c7541a86934067c2c0538124687fc90","Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < abd27a977b419d584efa659488c22d2306987b29","Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < 5ebb3ed757be3e04cf803026004aa0beaeb13e9b","Linux 5.14"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T18:55:16.364309Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:05:40.715Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74390","references":[{"url":"https://git.kernel.org/stable/c/4780f58672ee6328accd54a95f9c00683477e499"},{"url":"https://git.kernel.org/stable/c/79a20a8e201a779224b4bf115250a7713bde72c0"},{"url":"https://git.kernel.org/stable/c/9f8f0d2099e3de1194e37dc933ae0c4206b09aaf"},{"url":"https://git.kernel.org/stable/c/192a3be0e3759daa24af2841208b074ca6dbaabc"},{"url":"https://git.kernel.org/stable/c/424d51d33c7541a86934067c2c0538124687fc90"},{"url":"https://git.kernel.org/stable/c/abd27a977b419d584efa659488c22d2306987b29"},{"url":"https://git.kernel.org/stable/c/5ebb3ed757be3e04cf803026004aa0beaeb13e9b"}],"tags":["cve.org"],"epss":0.0013,"epssPercentile":0.02306,"ingestedAt":"2026-10-16T19:46:24.369Z","slug":"CVE-2026-74390","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/irdma: Fix out-of-bounds write in irdma_copy_user_pgaddrs\n\nThe irdma_copy_user_pgaddrs function loops through all of the umem DMA\nblocks to populate the PBLEs and will stop when either the last DMA\nblock is reached or palloc->total_cnt is reached. The issue is that\nthe logic for checking palloc->total_cnt would only work for non-zero\nvalues.\n\nWhen irdma_setup_pbles is called with lvl==0, it\ncalls irdma_copy_user_pgaddrs with palloc->total_cnt==0, which means\nthe only way to break out of the loop is to reach the last umem DMA\nblock, which means it could end up going beyond the fixed size of 4\niwmr->pgaddrmem array that is used in the lvl==0 case.\n\nIn the case of QP/CQ/SRQ rings, the value of lvl is determined by a\nseparate input (for example, req.cq_pages in the case of a CQ). So,\nwe must perform explicit checking to ensure we don't overflow the\npgaddrmem array if the user provides a umem that consists of more\nblocks than their provided req.cq_pages.\n\n## Affected\n\n- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < 4780f58672ee6328accd54a95f9c00683477e499`\n- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < 79a20a8e201a779224b4bf115250a7713bde72c0`\n- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < 9f8f0d2099e3de1194e37dc933ae0c4206b09aaf`\n- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < 192a3be0e3759daa24af2841208b074ca6dbaabc`\n- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < 424d51d33c7541a86934067c2c0538124687fc90`\n- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < abd27a977b419d584efa659488c22d2306987b29`\n- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < 5ebb3ed757be3e04cf803026004aa0beaeb13e9b`\n- `Linux 5.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}