{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74297", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.882Z", "datePublished": "2026-08-15T05:58:01.414Z", "dateUpdated": "2026-08-17T05:45:36.087Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:45:36.087Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx5: Fix undefined shift of user RQ WQE size\n\nset_rq_size() computes the RQ WQE size as \"1 << rq_wqe_shift\" based on\nthe user-provided rq_wqe_shift, which is only checked to be greater than\n32, so shifts of 32 are still accepted. A shift of 31 also overflows a\nsigned integer, leading to undefined behavior.\n\nUse check_shl_overflow() to compute the RQ WQE size and reject any\ninvalid values."}], "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 IB_USER_VERBS_CMD_CREATE_QP; malicious rq_wqe_shift is supplied in mlx5_ib_create_qp userspace data, not from remote RDMA/InfiniBand wire traffic.\nAC:L - An attacker with uverbs access can deterministically pass rq_wqe_shift values 31 or 32 in create_qp driver udata; no races or victim state beyond opening the device and issuing the ioctl are required.\nPR:L - Only local access to the RDMA character device is required (typically rdma group membership on HPC/AI cloud GPU nodes), not init-namespace root; this matches basic local user capability rather than administrator privilege.\nUI:N - No victim interaction is needed; the attacker triggers the flaw entirely through their own create_qp ioctl with crafted mlx5_ib_create_qp fields.\nS:U - Impact stays within the kernel and RDMA context of the attacking process/tenant; it is not a VM-hypervisor or cross-security-authority boundary escape despite using a network-capable NIC.\nC:H - Integer overflow/undefined shift can undersize ib_umem registration while hardware is programmed with a huge RQ stride, enabling out-of-bounds DMA reads and kernel/user memory disclosure beyond the registered queue buffer.\nI:H - Corrupted max_gs (e.g. negative from shift 31) bypasses scatter/gather limits in post_recv, and undersized buffers with oversized hardware stride allow out-of-bounds writes and exploitable memory corruption.\nA:H - Undefined signed shifts and inconsistent queue sizing can cause kernel oops/panic during QP setup or later queue operations, and misprogrammed hardware can hang or crash the host under active RDMA use."}]}], "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": "9fff54929cc00849d738faa99f06c32399aeb026", "status": "affected", "versionType": "git"}, {"version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "lessThan": "b746f949c2ac2b041102836095d6d4a2ef21fa75", "status": "affected", "versionType": "git"}, {"version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "lessThan": "c1dbf52d24a8cb1aa56780ba51b72e7d495f258c", "status": "affected", "versionType": "git"}, {"version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "lessThan": "6fc874fdfb366bfb11c62e6af9a831c8be59ddda", "status": "affected", "versionType": "git"}, {"version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "lessThan": "42f3d2c8c18b92ea33e506a38b64f1a8986c2823", 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{"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": "9fff54929cc00849d738faa99f06c32399aeb026", "status": "affected", "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "versionType": "git"}, {"lessThan": "b746f949c2ac2b041102836095d6d4a2ef21fa75", "status": "affected", "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "versionType": "git"}, {"lessThan": "c1dbf52d24a8cb1aa56780ba51b72e7d495f258c", "status": "affected", "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "versionType": "git"}, {"lessThan": "6fc874fdfb366bfb11c62e6af9a831c8be59ddda", "status": "affected", "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "versionType": "git"}, {"lessThan": "42f3d2c8c18b92ea33e506a38b64f1a8986c2823", "status": "affected", "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "versionType": "git"}, {"lessThan": "4b87a2497276a72fd63028e7419abf0fb7ed837b", "status": "affected", "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "versionType": "git"}, {"lessThan": "b732db02a2b04cde393638df19de6251ce62a74e", "status": "affected", "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "versionType": "git"}, {"lessThan": "d881d60223aac8fdc12b227d89c76e131e92a9cd", "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": "5.10.261", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.212", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.178", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "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 undefined shift of user RQ WQE size\n\nset_rq_size() computes the RQ WQE size as \"1 << rq_wqe_shift\" based on\nthe user-provided rq_wqe_shift, which is only checked to be greater than\n32, so shifts of 32 are still accepted. A shift of 31 also overflows a\nsigned integer, leading to undefined behavior.\n\nUse check_shl_overflow() to compute the RQ WQE size and reject any\ninvalid values."}], "id": "CVE-2026-74297", "lastModified": "2026-08-17T06:19:23.803", "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": "2026-08-15T06:22:29.307", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/42f3d2c8c18b92ea33e506a38b64f1a8986c2823"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4b87a2497276a72fd63028e7419abf0fb7ed837b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6fc874fdfb366bfb11c62e6af9a831c8be59ddda"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9fff54929cc00849d738faa99f06c32399aeb026"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b732db02a2b04cde393638df19de6251ce62a74e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b746f949c2ac2b041102836095d6d4a2ef21fa75"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c1dbf52d24a8cb1aa56780ba51b72e7d495f258c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d881d60223aac8fdc12b227d89c76e131e92a9cd"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: RDMA/mlx5: Fix undefined shift of user RQ WQE size", "id": "2516781", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516781"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1335", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nRDMA/mlx5: Fix undefined shift of user RQ WQE size\nset_rq_size() computes the RQ WQE size as \"1 << rq_wqe_shift\" based on\nthe user-provided rq_wqe_shift, which is only checked to be greater than\n32, so shifts of 32 are still accepted. A shift of 31 also overflows a\nsigned integer, leading to undefined behavior.\nUse check_shl_overflow() to compute the RQ WQE size and reject any\ninvalid values.", "A flaw was found in the Linux kernel's RDMA/mlx5 subsystem. Insufficient validation of a user-provided input, rq_wqe_shift, in the set_rq_size() function can lead to an integer overflow. This overflow results in an undefined shift operation, which may cause system instability or a denial of service."], "name": "CVE-2026-74297", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74297\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74297\nhttps://lore.kernel.org/linux-cve-announce/2026081549-CVE-2026-74297-4454@gregkh/T"], "threat_severity": "Moderate"}

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