{"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"}}}}