{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-92525", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-16T12:21:13.875Z", "datePublished": "2026-09-17T16:10:30.789Z", "dateUpdated": "2026-10-19T09:04:31.432Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:04:31.432Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Validate num_sge/cur_sge before indexing wqe->dma.sge[]\n\nFor a user QP, qp->sq.queue is a ring the application writes directly,\nso rxe_post_send() takes the is_user branch and only schedules send_task\nwithout validating the WQE. rxe_requester() consumes it in place via\nreq_next_wqe() and calls copy_data(), which indexes\n&wqe->dma.sge[cur_sge] with the attacker-controlled num_sge/cur_sge.\nOnly the kernel path bounds num_sge (validate_send_wr()); the user WQE\nis never checked, so a local unprivileged user can post a WQE with an\nout-of-range cur_sge or oversized num_sge and force an out-of-bounds\nread of the per-WQE sge array in copy_data() (vmalloc OOB read, local\nDoS).\n\nBound num_sge to qp->sq.max_sge in rxe_requester() before use, the way\nget_srq_wqe() already guards SRQ entries, and bound cur_sge only when\nthe WQE carries payload (dma.resid): copy_data() returns early on a\nzero-length copy before touching dma->sge[], so a zero-payload WQE --\nthe only kind a max_sge == 0 QP can post -- stays valid.\n\nReproduced under KASAN; the vmalloc-out-of-bounds in copy_data() is gone." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The attacker writes dma.num_sge/dma.cur_sge into the mmap'd send queue (rxe_init_sq→vmalloc_user, rxe_mmap); ib_uverbs_post_send only doorbells rxe_post_send, which for qp->is_user skips validate_send_wr() and schedules rxe_requester(). Inbound RoCE/UDP packets do not carry these WQE index fields.\nAC:L - The attacker fully controls the mmap'd SQ slot (cur_sge, num_sge, resid, opcode) and the producer_index, then issues IB_USER_VERBS_CMD_POST_SEND; rxe_requester→finish_packet→copy_data indexes sge[] with no race and no victim-side state.\nPR:L - uverbs_devnode() publishes /dev/infiniband/uverbsN as 0666; ib_uverbs_open, ib_uverbs_create_qp, ib_uverbs_modify_qp and ib_uverbs_post_send require no capability for IB_QPT_UD/RC, so an unprivileged local user can create a user QP, mmap the SQ and post the malformed WQE.\nUI:N - The attacker creates their own user QP, writes the malformed send WQE into their mmap'd SQ and doorbells post_send; no other user must mount, open a file, or otherwise act.\nS:U - The vmalloc OOB in copy_data() runs in the host kernel rxe requester on behalf of the local process and does not cross a VM, guest-to-host, or IOMMU/DMA authority boundary.\nC:H - copy_data() does &dma->sge[dma->cur_sge] with attacker-controlled u32 cur_sge/num_sge into the vmalloc SQ and then reads sge->length/lkey/addr; an oversized num_sge also lets the sge++ loop walk unbounded kernel vmalloc (KASAN vmalloc-out-of-bounds).\nI:N - finish_packet() calls copy_data(..., RXE_FROM_MR_OBJ), which only reads MR contents into the SKB; the OOB is a read of sge descriptors, dma updates stay in the attacker's mmap'd WQE, and lookup_mr/rxe_mr_copy remain confined to MRs in the caller's PD.\nA:H - Indexing &wqe->dma.sge[cur_sge] past the vmalloc_user send-queue object is a KASAN-reproduced vmalloc-out-of-bounds in copy_data() that oopses/panics the kernel." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/sw/rxe/rxe_req.c" ], "versions": [ { "version": "8700e3e7c4857d28ebaa824509934556da0b3e76", "lessThan": "69d3ccf6543f24c452a020c8028ca6f46cb1e8db", "status": "affected", "versionType": "git" }, { "version": "8700e3e7c4857d28ebaa824509934556da0b3e76", "lessThan": "750bba6ce9bb0b11d6a166031c9728ae3f21765e", "status": "affected", "versionType": "git" }, { "version": "8700e3e7c4857d28ebaa824509934556da0b3e76", "lessThan": "c067aa7b231e91a18a1b3666201ab14dfb00347a", "status": "affected", "versionType": "git" }, { "version": "8700e3e7c4857d28ebaa824509934556da0b3e76", "lessThan": "13cb7160e5b791f5e3ecf9311cf32849fe7e9b62", "status": "affected", "versionType": "git" }, { "version": "8700e3e7c4857d28ebaa824509934556da0b3e76", "lessThan": "5ec111ddc1f727c1e4580aea459842ae5a8359a5", "status": "affected", "versionType": "git" }, { "version": "8700e3e7c4857d28ebaa824509934556da0b3e76", "lessThan": "126c757e4cd46f866ddc283143b58eb4d9bf52cd", "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/sw/rxe/rxe_req.c" ], "versions": [ { "version": "4.8", "status": "affected" }, { "version": "0", "lessThan": "4.8", "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": "4.8", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/69d3ccf6543f24c452a020c8028ca6f46cb1e8db" }, { "url": "https://git.kernel.org/stable/c/750bba6ce9bb0b11d6a166031c9728ae3f21765e" }, { "url": "https://git.kernel.org/stable/c/c067aa7b231e91a18a1b3666201ab14dfb00347a" }, { "url": "https://git.kernel.org/stable/c/13cb7160e5b791f5e3ecf9311cf32849fe7e9b62" }, { "url": "https://git.kernel.org/stable/c/5ec111ddc1f727c1e4580aea459842ae5a8359a5" }, { "url": "https://git.kernel.org/stable/c/126c757e4cd46f866ddc283143b58eb4d9bf52cd" } ], "title": "RDMA/rxe: Validate num_sge/cur_sge before indexing wqe->dma.sge[]", "x_generator": { "engine": "bippy-1.2.0" } } } }