CVE-2026-68417 (GCVE-0-2026-68417)
Vulnerability from cvelistv5
Published
2026-08-10 12:04
Modified
2026-10-19 21:09
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: publish QP after initialization siw_create_qp() currently calls siw_qp_add() before the queues, CQ pointers, state, completion, and device list entry are ready. A QPN lookup can therefore reach a QP that is still being constructed. Move siw_qp_add() to the end of siw_create_qp(), after QP initialization and before adding the QP to the siw device list.
Impacted products
Vendor Product Version
Linux Linux Version: f29dd55b0236f7a26a4b9dd69186e3c04266797b
Version: f29dd55b0236f7a26a4b9dd69186e3c04266797b
Version: f29dd55b0236f7a26a4b9dd69186e3c04266797b
Version: f29dd55b0236f7a26a4b9dd69186e3c04266797b
Version: f29dd55b0236f7a26a4b9dd69186e3c04266797b
Version: f29dd55b0236f7a26a4b9dd69186e3c04266797b
Version: f29dd55b0236f7a26a4b9dd69186e3c04266797b
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              "value": "AV:L - Exploitation requires local access to the RDMA character devices (/dev/infiniband/uverbsN for create_qp and /dev/infiniband/rdma_cm for the QPN lookup); no network packet reaches the racing code path without a local trigger first.\nAC:L - The attacker controls both sides of the race: one thread issues create_qp while another issues rdma_connect/rdma_accept with an attacker-supplied qp_num, and QPNs from xa_alloc(XA_FLAGS_ALLOC1) are predictable. The post-publish failure can be made deterministic by passing a short udata-\u003eoutlen, so the window is wide and repeatable at will.\nPR:L - Any unprivileged local user with access to the siw uverbs and rdma_cm character devices can create QPs and issue rdma_connect/rdma_accept with an arbitrary qp_num; no capability check gates siw_create_qp, siw_connect or siw_accept.\nUI:N - The attacker drives both the QP creation and the concurrent QPN lookup from its own threads; no action by any other user or administrator is needed.\nS:U - The corruption is confined to kernel memory managed by the same kernel security authority; there is no crossing of a VM, IOMMU or sandbox boundary.\nC:H - The siw_qp object can be kfree\u0027d by the ib core error path while the CM thread still holds a reference, giving a use-after-free on a slab object the attacker can groom and read back through QP/CM state, enabling disclosure of arbitrary kernel memory.\nI:H - After the free, siw_free_qp() performs list_del(\u0026qp-\u003edevq), vfree() of four pointer fields and siw_put_tx_cpu(qp-\u003etx_cpu) using values read from reallocated attacker-controlled memory, yielding arbitrary-pointer free, list-unlink writes and out-of-range per-CPU decrements suitable for control-flow hijacking.\nA:H - Even without exploitation the race reliably causes kernel crashes: NULL sendq/recvq/scq/rcq dereferences, list_del on an uninitialized devq head, waits on an uninitialized qp_free completion, and use-after-free oopses."
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The post-publish failure can be made deterministic by passing a short udata-\u003eoutlen, so the window is wide and repeatable at will.\\nPR:L - Any unprivileged local user with access to the siw uverbs and rdma_cm character devices can create QPs and issue rdma_connect/rdma_accept with an arbitrary qp_num; no capability check gates siw_create_qp, siw_connect or siw_accept.\\nUI:N - The attacker drives both the QP creation and the concurrent QPN lookup from its own threads; no action by any other user or administrator is needed.\\nS:U - The corruption is confined to kernel memory managed by the same kernel security authority; there is no crossing of a VM, IOMMU or sandbox boundary.\\nC:H - The siw_qp object can be kfree\u0027d by the ib core error path while the CM thread still holds a reference, giving a use-after-free on a slab object the attacker can groom and read back through QP/CM state, enabling disclosure of arbitrary kernel memory.\\nI:H - After the free, siw_free_qp() performs list_del(\u0026qp-\u003edevq), vfree() of four pointer fields and siw_put_tx_cpu(qp-\u003etx_cpu) using values read from reallocated attacker-controlled memory, yielding arbitrary-pointer free, list-unlink writes and out-of-range per-CPU decrements suitable for control-flow hijacking.\\nA:H - 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A QPN\\nlookup can therefore reach a QP that is still being constructed.\\n\\nMove siw_qp_add() to the end of siw_create_qp(), after QP\\ninitialization and before adding the QP to the siw device list.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.216\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.183\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.148\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.101\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.42\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.6\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"5.3\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-19T16:35:15.087Z\"}}}",
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}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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