{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-93037", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-17T15:57:05.656Z", "datePublished": "2026-09-17T16:10:31.452Z", "dateUpdated": "2026-10-19T09:04:32.386Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:04:32.386Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/hfi1: Propagate sdma_txinit_ahg() errors\n\nset_txreq_header_ahg() ignores the return value of sdma_txinit_ahg().\n\nIf sdma_txinit_ahg() fails, it returns before initializing tx->txreq.\nHowever, set_txreq_header_ahg() ignores the error and returns the AHG\nchange count, causing the caller to continue processing the request as\nthough initialization had succeeded.\n\nPropagate sdma_txinit_ahg() failures to the caller and abort request\nprocessing when initialization fails.\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE." } ], "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 attacker-controlled bytes are the sdma_req_info/header/iovecs copy_from_user()'d in hfi1_user_sdma_process_request(), reached only from hfi1_write_iter() on the hfi1 user cdev. A remote Omni-Path peer does not supply that request; kernel verbs already check sdma_txinit_ahg() and are not this bug.\nAC:L - On the AHG path (npkts>1 and HFI1_CAP_IS_USET(SDMA_AHG) so ahg_idx>=0), the attacker sets a later packet's datalen to 0 or info.fragsize>MAX_SDMA_PKT_SIZE so sdma_txinit_ahg() returns -ENODATA/-EMSGSIZE. set_txreq_header_ahg() still returns the AHG index count, and user_sdma_send_pkts() continues with no race.\nPR:L - hfi1_user_devnode() creates /dev/hfi1_N with mode 0666, and hfi1_file_open()/assign_ctxt() perform no capability checks, so an ordinary unprivileged local user can assign a context and writev() the crafted SDMA request.\nUI:N - Exploitation is the attacker's own open, HFI1_IOCTL_ASSIGN_CTXT, and writev() of a multi-packet user SDMA request; no other user must mount media, open a file, or otherwise interact.\nS:U - The uninitialized user_sdma_txreq.txreq is consumed by make_tx_sdma_desc() and submit_tx() inside the host hfi1 driver; impact is host-kernel memory/DMA corruption, not a guest-to-host, IOMMU, or other authority-boundary escape.\nC:H - user_sdma_send_pkts() still calls hfi1_add_pages_to_sdma_packet() after the failed sdma_txinit_ahg(), and make_tx_sdma_desc() reads/writes through uninitialized tx->descp. A recycled txreq_cache object whose extended descp was kfree'd in __sdma_txclean() is a use-after-free, enabling kernel info disclosure.\nI:H - make_tx_sdma_desc() writes DMA address and length through that uninitialized/dangling descp, and submit_tx() copies those descriptors into the SDMA ring. That is an arbitrary kernel write and hardware DMA of attacker-influenced descriptors, enabling control-flow hijack.\nA:H - submit_tx() always loads descp->qw[0] even when num_desc is 0, so a NULL descp from an uninitialized txreq is a kernel NULL-deref oops; garbage num_desc/descriptors also crash or halt the SDMA engine." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/hw/hfi1/user_sdma.c" ], "versions": [ { "version": "e3304b7cc4f14d365f46d6847a35563ae8b017f7", "lessThan": "cb73c2fe6e9cf563c99f22b7c8bca0d5f70d603e", "status": "affected", "versionType": "git" }, { "version": "e3304b7cc4f14d365f46d6847a35563ae8b017f7", "lessThan": "122a730675565ff2ad210537c3fc3afb8291d482", "status": "affected", "versionType": "git" }, { "version": "e3304b7cc4f14d365f46d6847a35563ae8b017f7", "lessThan": "bf974994150cfd14bfc599748925f4d426e00d90", "status": "affected", "versionType": "git" }, { "version": "e3304b7cc4f14d365f46d6847a35563ae8b017f7", "lessThan": "fd6dee13f3857259b6b2ddd28e1ed95fd94ae2f9", "status": "affected", "versionType": "git" }, { "version": "e3304b7cc4f14d365f46d6847a35563ae8b017f7", "lessThan": "5b7cefffd15d87c8103865f887cdcf9077d8094b", "status": "affected", "versionType": "git" }, { "version": "e3304b7cc4f14d365f46d6847a35563ae8b017f7", "lessThan": "3416db552eb378e54cb2f2ce0db5f0df88654bda", "status": "affected", "versionType": "git" }, { "version": "e3304b7cc4f14d365f46d6847a35563ae8b017f7", "lessThan": "ca99431820e8cac19f6a091c04da54cbe8d64f52", "status": "affected", "versionType": "git" }, { "version": "e3304b7cc4f14d365f46d6847a35563ae8b017f7", "lessThan": "091c6162c022cbdfb64219708a71728cfd1d4600", "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/hfi1/user_sdma.c" ], "versions": [ { "version": "4.14", "status": "affected" }, { "version": "0", "lessThan": "4.14", "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": "4.14", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/cb73c2fe6e9cf563c99f22b7c8bca0d5f70d603e" }, { "url": "https://git.kernel.org/stable/c/122a730675565ff2ad210537c3fc3afb8291d482" }, { "url": "https://git.kernel.org/stable/c/bf974994150cfd14bfc599748925f4d426e00d90" }, { "url": "https://git.kernel.org/stable/c/fd6dee13f3857259b6b2ddd28e1ed95fd94ae2f9" }, { "url": "https://git.kernel.org/stable/c/5b7cefffd15d87c8103865f887cdcf9077d8094b" }, { "url": "https://git.kernel.org/stable/c/3416db552eb378e54cb2f2ce0db5f0df88654bda" }, { "url": "https://git.kernel.org/stable/c/ca99431820e8cac19f6a091c04da54cbe8d64f52" }, { "url": "https://git.kernel.org/stable/c/091c6162c022cbdfb64219708a71728cfd1d4600" } ], "title": "RDMA/hfi1: Propagate sdma_txinit_ahg() errors", "x_generator": { "engine": "bippy-1.2.0" } } } }