CVE-2026-90435

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-90435", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.815Z", "datePublished": "2026-09-17T16:09:54.399Z", "dateUpdated": "2026-10-19T09:03:41.405Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:03:41.405Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx5: Fix integer overflow of user QP buffer size\n\nset_user_buf_size() computes the QP buffer size by left-shifting the\nuser-supplied rq.wqe_cnt and rq.wqe_shift values as signed integers.\nA sufficiently large rq.wqe_cnt causes signed integer overflow, which\nis undefined behavior, and yields a small or negative buf_size, causing\nib_umem_get() to map a buffer smaller than the hardware will actually\nwrite into.\n\nReplace the shifts and addition with check_shl_overflow() and\ncheck_add_overflow(), rejecting invalid user inputs.\n\nMoreover, guard the identical shift computing qp->sq.offset in\n_create_user_qp() before set_user_buf_size() is reached."}], "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 - The overflowing inputs are mlx5_ib_create_qp.rq_wqe_count and rq_wqe_shift in driver udata, copied by ib_copy_from_udata() in mlx5_ib_create_qp() from a local write/ioctl on /dev/infiniband/uverbsN (IB_USER_VERBS_CMD_CREATE_QP / UVERBS_METHOD_QP_CREATE). A remote RoCE/InfiniBand peer does not supply those fields.\nAC:L - The attacker sets rq_wqe_count and rq_wqe_shift directly. set_rq_size() copies them into qp->rq without bounding wqe_cnt against log_max_qp_sz (only ib_uverbs_ex_create_qp.max_recv_wr is capped), so a small max_recv_wr plus a huge rq_wqe_count reliably overflows the signed wqe_cnt<<wqe_shift in set_user_buf_size() and the sq.offset shift in _create_user_qp().\nPR:L - ib_uverbs_open() and ib_uverbs_alloc_pd() have no capability check, and uverbs_devnode() creates /dev/infiniband/uverbs* as 0666. IB_QPT_RC CREATE_QP does not call rdma_uattrs_has_raw_cap() (that gate is only IB_QPT_RAW_PACKET), so an unprivileged local user with uverbs access can reach the overflow.\nUI:N - The attacker opens uverbs, allocates a PD and CQ, and issues CREATE_QP with crafted mlx5_ib_create_qp.rq_wqe_count/rq_wqe_shift. No other user must mount a device, open a file, or confirm the operation.\nS:U - The mismatch is between ib_umem_get_attr_or_va() pinning and the same process's mlx5 CREATE_QP WQ programming. Resulting DMA or kernel corruption stays in the host kernel that serves that uverbs file; it is not a guest-to-host or IOMMU cross-VM escape.\nC:H - A wrapped wqe_cnt<<wqe_shift produces a small ubuffer.buf_size, so ib_umem_get_attr_or_va() and mlx5_ib_populate_pas() register fewer pages than create_user_qp() programs via log_rq_size/log_rq_stride. The NIC then DMA-reads past the pinned QP buffer, disclosing kernel or other-process memory.\nI:H - The same undersized PAS versus programmed RQ size lets hardware DMA-write beyond the umem into adjacent physical pages, and a wrapped qp->sq.offset misplaces the send queue in the combined buffer. That is an out-of-bounds write usable for corruption and control-flow hijack.\nA:H - Hardware accessing an RQ larger than the pinned umem, or firmware CREATE_QP with a truncated PAS list, causes IOMMU faults, device errors, or a kernel oops/panic; a negative overflowed buf_size passed to ib_umem_get_attr_or_va() as size_t can also fault during QP setup."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/infiniband/hw/mlx5/qp.c"], "versions": [{"version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "lessThan": "ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20", "status": "affected", "versionType": "git"}, {"version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "lessThan": "d99622e40aaa910ade681dfd4dc0fa240a011331", "status": "affected", "versionType": "git"}, {"version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "lessThan": "c845e5e05140ea1bc64a5b1107942d93c876034d", "status": "affected", "versionType": "git"}, {"version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "lessThan": "42fb8aefffff5b458aaa66803364a16e0ea44129", "status": "affected", "versionType": "git"}, {"version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "lessThan": "d7fa2ff72ad1861eac194a4e0075d504ba8c246e", "status": "affected", "versionType": "git"}, {"version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "lessThan": "5b6cfc6d7ff0959dd9766fdc24286a253b59ca77", "status": "affected", "versionType": "git"}, {"version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "lessThan": "f917707f0de0832b8ab582391b1f64e549995c6c", "status": "affected", "versionType": "git"}, {"version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "lessThan": "dec47e4b0fe34afdf38caa72b4408ba95502e5de", "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/mlx5/qp.c"], "versions": [{"version": "3.11", "status": "affected"}, {"version": "0", "lessThan": "3.11", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "3.11", "versionEndExcluding": "5.10.270"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "5.15.221"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.12.110"}, {"vulnerable": true, "criteria": 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"https://git.kernel.org/stable/c/f917707f0de0832b8ab582391b1f64e549995c6c"}, {"url": "https://git.kernel.org/stable/c/dec47e4b0fe34afdf38caa72b4408ba95502e5de"}], "title": "RDMA/mlx5: Fix integer overflow of user QP buffer size", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/infiniband/hw/mlx5/qp.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20", "status": "affected", "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "versionType": "git"}, {"lessThan": "d99622e40aaa910ade681dfd4dc0fa240a011331", "status": "affected", "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "versionType": "git"}, {"lessThan": "c845e5e05140ea1bc64a5b1107942d93c876034d", "status": "affected", "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "versionType": "git"}, {"lessThan": "42fb8aefffff5b458aaa66803364a16e0ea44129", "status": "affected", "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "versionType": "git"}, {"lessThan": "d7fa2ff72ad1861eac194a4e0075d504ba8c246e", "status": "affected", "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "versionType": "git"}, {"lessThan": "5b6cfc6d7ff0959dd9766fdc24286a253b59ca77", "status": "affected", "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "versionType": "git"}, {"lessThan": "f917707f0de0832b8ab582391b1f64e549995c6c", "status": "affected", "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "versionType": "git"}, {"lessThan": "dec47e4b0fe34afdf38caa72b4408ba95502e5de", "status": "affected", "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/infiniband/hw/mlx5/qp.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.11"}, {"lessThan": "3.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.270", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.110", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.52", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx5: Fix integer overflow of user QP buffer size\n\nset_user_buf_size() computes the QP buffer size by left-shifting the\nuser-supplied rq.wqe_cnt and rq.wqe_shift values as signed integers.\nA sufficiently large rq.wqe_cnt causes signed integer overflow, which\nis undefined behavior, and yields a small or negative buf_size, causing\nib_umem_get() to map a buffer smaller than the hardware will actually\nwrite into.\n\nReplace the shifts and addition with check_shl_overflow() and\ncheck_add_overflow(), rejecting invalid user inputs.\n\nMoreover, guard the identical shift computing qp->sq.offset in\n_create_user_qp() before set_user_buf_size() is reached."}], "id": "CVE-2026-90435", "lastModified": "2026-10-19T09:19:37.810", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-17T17:17:48.770", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/42fb8aefffff5b458aaa66803364a16e0ea44129"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5b6cfc6d7ff0959dd9766fdc24286a253b59ca77"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c845e5e05140ea1bc64a5b1107942d93c876034d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d7fa2ff72ad1861eac194a4e0075d504ba8c246e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d99622e40aaa910ade681dfd4dc0fa240a011331"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dec47e4b0fe34afdf38caa72b4408ba95502e5de"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f917707f0de0832b8ab582391b1f64e549995c6c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c,ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c,d99622e40aaa910ade681dfd4dc0fa240a011331)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c,c845e5e05140ea1bc64a5b1107942d93c876034d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c,42fb8aefffff5b458aaa66803364a16e0ea44129)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c,d7fa2ff72ad1861eac194a4e0075d504ba8c246e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c,5b6cfc6d7ff0959dd9766fdc24286a253b59ca77)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c,f917707f0de0832b8ab582391b1f64e549995c6c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c,dec47e4b0fe34afdf38caa72b4408ba95502e5de)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.11)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.10.270,6.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.15.221,6.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.188,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.157,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.110,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.52,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.6,8.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-19T09:30:13.147260+00:00", "updated": "2026-09-20T02:00:13.567565+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-190", "CWE-680"]}