{ "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", "status": "affected", "versionType": "git" }, { "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "lessThan": "4b87a2497276a72fd63028e7419abf0fb7ed837b", "status": "affected", "versionType": "git" }, { "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "lessThan": "b732db02a2b04cde393638df19de6251ce62a74e", "status": "affected", "versionType": "git" }, { "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c", "lessThan": "d881d60223aac8fdc12b227d89c76e131e92a9cd", "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": "5.10.261", "lessThanOrEqual": "5.10.*", "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": "3.11", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/9fff54929cc00849d738faa99f06c32399aeb026" }, { "url": "https://git.kernel.org/stable/c/b746f949c2ac2b041102836095d6d4a2ef21fa75" }, { "url": "https://git.kernel.org/stable/c/c1dbf52d24a8cb1aa56780ba51b72e7d495f258c" }, { "url": "https://git.kernel.org/stable/c/6fc874fdfb366bfb11c62e6af9a831c8be59ddda" }, { "url": "https://git.kernel.org/stable/c/42f3d2c8c18b92ea33e506a38b64f1a8986c2823" }, { "url": "https://git.kernel.org/stable/c/4b87a2497276a72fd63028e7419abf0fb7ed837b" }, { "url": "https://git.kernel.org/stable/c/b732db02a2b04cde393638df19de6251ce62a74e" }, { "url": "https://git.kernel.org/stable/c/d881d60223aac8fdc12b227d89c76e131e92a9cd" } ], "title": "RDMA/mlx5: Fix undefined shift of user RQ WQE size", "x_generator": { "engine": "bippy-1.2.0" } } } }