{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2023-52509",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2023-52509"
  ],
  "published": "2024-03-02T21:53:07Z",
  "summary": "ravb: Fix use-after-free issue in ravb_tx_timeout_work()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nravb: Fix use-after-free issue in ravb_tx_timeout_work()\n\nThe ravb_stop() should call cancel_work_sync(). Otherwise,\nravb_tx_timeout_work() is possible to use the freed priv after\nravb_remove() was called like below:\n\nCPU0\t\t\tCPU1\n\t\t\travb_tx_timeout()\nravb_remove()\nunregister_netdev()\nfree_netdev(ndev)\n// free priv\n\t\t\travb_tx_timeout_work()\n\t\t\t// use priv\n\nunregister_netdev() will call .ndo_stop() so that ravb_stop() is\ncalled. And, after phy_stop() is called, netif_carrier_off()\nis also called. So that .ndo_tx_timeout() will not be called\nafter phy_stop().",
  "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": "6.1.59",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-52509"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/65d34cfd4e347054eb4193bc95d9da7eaa72dee5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/db9aafa19547833240f58c2998aed7baf414dc82"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/616761cf9df9af838c0a1a1232a69322a9eb67e6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6f6fa8061f756aedb93af12a8a5d3cf659127965"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/105abd68ad8f781985113aee2e92e0702b133705"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3971442870713de527684398416970cf025b4f89"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:24:39Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The UAF is triggered when local teardown (ravb_close via ip link down, system suspend, or ravb_remove/unbind) races with locally scheduled ravb_tx_timeout_work; remote packets alone cannot free priv or cancel the work.\nAC:L - Once TX-timeout work is queued, the attacker (or routine automotive autosuspend) fully controls when close/remove runs, and ravb_stop_dma inside the worker creates a wide, repeatable window overlapping teardown without relying on an uncontrolled memory layout.\nPR:L - On Renesas R-Car embedded/automotive deployments, ordinary socket traffic arms the timeout path and system autosleep/idle suspend invokes ravb_close without CAP_NET_ADMIN; the same close-vs-work UAF needs no platform unbind/root, matching the CVE-2025-21801 ravb scoring precedent.\nUI:N - Traffic generation and interface/suspend teardown are driven by the attacker or by automatic power-management on the affected platforms; no separate victim user action is required.\nS:U - The use-after-free corrupts host-kernel heap/DMA objects (ravb_private, descriptor rings) within a single kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - ravb_tx_timeout_work continues to dereference priv and ring/skb pointers after free_netdev or ravb_ring_free, so reclaiming those slabs yields an arbitrary kernel-memory read primitive.\nI:H - The same UAF/double-free path re-enters ravb_ring_free/ravb_dmac_init on attacker-reclaimable objects (including work_struct and DMA state), enabling heap corruption and control-flow hijacking.\nA:H - Use-after-free of priv or double-free of DMA rings causes kernel oops/panic and takes down the primary Ethernet interface, as is typical for this race class."
    }
  }
}