{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46178",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-46178"
  ],
  "published": "2026-05-28T09:36:53Z",
  "summary": "RDMA/mlx4: Fix resource leak on error in mlx4_ib_create_srq()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx4: Fix resource leak on error in mlx4_ib_create_srq()\n\nSashiko points out that mlx4_srq_alloc() was not undone during error\nunwind, add the missing call to mlx4_srq_free().",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.175",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46178"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/53fd4c03558672ccb167754fbacbf045c7ab335c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0be6ae614ca7fa53e7389e3c7462ed20abbd4192"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5b3b220d54e6a3d77380cb7caa1ef79cb8f4fc94"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c5dc30da990045105c9762248d23076223e7878a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0dbd619716fb07b7de1acd64fec673ee6e1adde7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e01b8c9286c470b71a38acd320106f2c4f2826a1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/388617f44d81604a760742a0b5de292d411e63e3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c54c7e4cb679c0aaa1cb489b9c3f2cd98e63a44c"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable path is reached only through the local RDMA uverbs device interface (/dev/infiniband/uverbsN) via a create-SRQ command with driver udata present; it is not reachable from a network peer.\nAC:L - The attacker reliably forces the failing path by supplying a bad/unmapped response buffer (`copy_to_user` \u2192 -EFAULT), which deterministically creates the dangling radix-tree pointer to freed memory; per UAF guidance this is Low.\nPR:L - Triggering requires only an unprivileged local account with access to the RDMA verbs device, which is commonly exposed to non-root users in HPC/cloud/RDMA-enabled environments; no real root is needed.\nUI:N - The attacker performs the create-SRQ call and supplies the faulting buffer entirely on their own; no victim action is required.\nS:U - The freed object and its corruption stay within the kernel's own security authority; there is no crossing of a VM/IOMMU/sandbox boundary.\nC:H - The dangling pointer is a use-after-free; reclaiming the freed `mlx4_ib_srq` lets an attacker control its contents and read kernel memory through the event-handler dereference chain.\nI:H - The UAF causes `mlx4_srq_event()` to write to freed memory and call function pointers (`srq->event`, `event_handler`) read from freed memory, giving a heap-spray-based control-flow-hijack / arbitrary-write primitive.\nA:H - Dereferencing the freed object reliably crashes the kernel, and repeatedly exercising the bug also exhausts the finite hardware SRQ/ICM resource pool, denying RDMA service."
    }
  }
}