{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74390", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.891Z", "datePublished": "2026-08-15T05:59:04.479Z", "dateUpdated": "2026-10-16T19:05:40.715Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:46:38.735Z" }, "descriptions": [ { "lang": "en", "value": "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 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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - Exploitation requires a local ioctl on /dev/infiniband/uverbs to register CQ/QP/SRQ memory via irdma_reg_user_mr; the bug is not reachable from remote iWARP/RoCE packet handling.\nAC:L - An attacker fully controls reg_type, cq_pages/sq_pages/rq_pages, and umem size; triggering lvl==0 with many DMA blocks is deterministic and needs no races or special memory layout.\nPR:L - Any unprivileged local user who can open the uverbs device (mode 0666) and use the RDMA NIC—typical on cloud/HPC RDMA nodes—can invoke the vulnerable MR registration path without real root.\nUI:N - No victim interaction is required; the attacker triggers the overflow directly through their own RDMA verbs memory registration calls.\nS:U - Impact is kernel heap corruption and privilege escalation within the host kernel security boundary, not a cross-VM or cross-IOMMU sandbox escape.\nC:H - The out-of-bounds write of attacker-influenced DMA addresses into adjacent irdma_mr/iwpbl heap metadata can be leveraged for arbitrary kernel memory read primitives, not merely a bounded leak.\nI:H - Controlled out-of-bounds u64 writes past pgaddrmem[4] corrupt adjacent kernel heap structures and are suitable for control-flow or arbitrary kernel write exploitation.\nA:H - Heap corruption in a kzalloc'd irdma_mr can cause immediate kernel oops/panic during registration or on subsequent use of corrupted queue memory metadata." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/hw/irdma/verbs.c" ], "versions": [ { "version": "b48c24c2d710cf34810c555dcef883a3d35a9c08", "lessThan": "4780f58672ee6328accd54a95f9c00683477e499", "status": "affected", "versionType": "git" }, { "version": "b48c24c2d710cf34810c555dcef883a3d35a9c08", "lessThan": "79a20a8e201a779224b4bf115250a7713bde72c0", "status": "affected", "versionType": "git" }, { "version": "b48c24c2d710cf34810c555dcef883a3d35a9c08", "lessThan": "9f8f0d2099e3de1194e37dc933ae0c4206b09aaf", "status": "affected", "versionType": "git" }, { "version": "b48c24c2d710cf34810c555dcef883a3d35a9c08", "lessThan": "192a3be0e3759daa24af2841208b074ca6dbaabc", "status": "affected", "versionType": "git" }, { "version": "b48c24c2d710cf34810c555dcef883a3d35a9c08", "lessThan": "424d51d33c7541a86934067c2c0538124687fc90", "status": "affected", "versionType": "git" }, { "version": "b48c24c2d710cf34810c555dcef883a3d35a9c08", "lessThan": "abd27a977b419d584efa659488c22d2306987b29", "status": "affected", "versionType": "git" }, { "version": "b48c24c2d710cf34810c555dcef883a3d35a9c08", "lessThan": "5ebb3ed757be3e04cf803026004aa0beaeb13e9b", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/hw/irdma/verbs.c" ], "versions": [ { "version": "5.14", "status": "affected" }, { "version": "0", "lessThan": "5.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "7.2" } ] } ] } ], "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" } ], "title": "RDMA/irdma: Fix out-of-bounds write in irdma_copy_user_pgaddrs", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-74390", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T18:55:16.364309Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:05:40.715Z" } } ] } }