CVE-2026-64585 (GCVE-0-2026-64585)

Vulnerability from cvelistv5 – Published: 2026-08-06 07:06 – Updated: 2026-08-08 15:13
VLAI
Title
can: esd_usb: kill anchored URBs before freeing netdevs
Summary
In the Linux kernel, the following vulnerability has been resolved: can: esd_usb: kill anchored URBs before freeing netdevs esd_usb_disconnect() frees each CAN netdev with free_candev() inside its per-netdev loop and only calls unlink_all_urbs(dev) afterwards. The per-netdev private data (struct esd_usb_net_priv) is embedded in the net_device allocation returned by alloc_candev(), so once free_candev() has run, dev->nets[i] points to freed memory. unlink_all_urbs() then dereferences the freed dev->nets[i] to kill the per-netdev TX anchor (usb_kill_anchored_urbs(&priv->tx_submitted)), clear active_tx_jobs, and reset priv->tx_contexts[]. Reorder the teardown so the anchored URBs are killed before the netdevs are freed, matching other CAN/USB drivers in the same directory such as ems_usb, usb_8dev and mcba_usb, which unregister, then unlink, then free: unregister the netdevs first (which stops their TX queues), call unlink_all_urbs(dev) once, then free the netdevs. This issue was found by an in-house static analysis tool.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 96d8e90382dc336b5de401164597edfdc2e8d9f1 , < aa1d005927db38af783c1a4a8a00a39e0229ab2d (git)
Affected: 96d8e90382dc336b5de401164597edfdc2e8d9f1 , < a02e1d8f191324583599544d54e59e6a2b74bb0e (git)
Affected: 96d8e90382dc336b5de401164597edfdc2e8d9f1 , < a3314f10369df70925140f59bbe069718f65a0b9 (git)
Affected: 96d8e90382dc336b5de401164597edfdc2e8d9f1 , < 765ba1c91823a296447528791b89a6504947fd5c (git)
Affected: 96d8e90382dc336b5de401164597edfdc2e8d9f1 , < 5832c55b3c824ba2fe9c36ac3c411baddcce053e (git)
Affected: 96d8e90382dc336b5de401164597edfdc2e8d9f1 , < c43122fef328a70045fe7621c06de6b2b8e19264 (git)
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Linux Linux Affected: 2.6.36
Unaffected: 0 , < 2.6.36 (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc4 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/can/usb/esd_usb.c"
          ],
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
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            {
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              "versionType": "semver"
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc4",
              "versionType": "original_commit_for_fix"
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          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: esd_usb: kill anchored URBs before freeing netdevs\n\nesd_usb_disconnect() frees each CAN netdev with free_candev() inside\nits per-netdev loop and only calls unlink_all_urbs(dev) afterwards.\nThe per-netdev private data (struct esd_usb_net_priv) is embedded in\nthe net_device allocation returned by alloc_candev(), so once\nfree_candev() has run, dev-\u003enets[i] points to freed memory.\nunlink_all_urbs() then dereferences the freed dev-\u003enets[i] to kill the\nper-netdev TX anchor (usb_kill_anchored_urbs(\u0026priv-\u003etx_submitted)),\nclear active_tx_jobs, and reset priv-\u003etx_contexts[].\n\nReorder the teardown so the anchored URBs are killed before the netdevs\nare freed, matching other CAN/USB drivers in the same directory such as\nems_usb, usb_8dev and mcba_usb, which unregister, then unlink, then\nfree: unregister the netdevs first (which stops their TX queues), call\nunlink_all_urbs(dev) once, then free the netdevs.\n\nThis issue was found by an in-house static analysis tool."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The UAF is reached by forcing esd_usb_disconnect() via local usbfs USBDEVFS_DISCONNECT, sysfs unbind, or USB emulation, not by network/CAN traffic; this matches AV:L scoring of analogous USB disconnect UAFs (e.g. CVE-2025-40283).\nAC:L - Once disconnect runs, free_candev() then unlink_all_urbs() deterministically uses freed esd_usb_net_priv in the same teardown path; the attacker fully controls when unbind occurs, with no attacker-uncontrollable race required.\nPR:L - A basic local account with write access to the USB device node (plugdev/uaccess or USB passthrough) can issue USBDEVFS_DISCONNECT; that path has no CAP_SYS_ADMIN check, so init-namespace root is not required.\nUI:N - The attacker issues disconnect/unbind against an already-bound esd CAN-USB interface (or their own matching VID/PID device) without any separate victim action.\nS:U - The freed netdev-private object and subsequent URB teardown run entirely within the host kernel security authority; this is not a VM, IOMMU, or sandbox boundary escape.\nC:H - Use-after-free of struct esd_usb_net_priv (embedded in the freed candev) lets a reclaimed object supply attacker-controlled pointer-rich state read through usb_kill_anchored_urbs() and related teardown, enabling kernel disclosure.\nI:H - unlink_all_urbs() writes through the freed priv (usb_kill_anchored_urbs on tx_submitted, atomic_set of active_tx_jobs, and tx_contexts[] resets), giving a heap UAF write primitive suitable for control-flow hijack.\nA:H - Dereferencing the freed per-netdev private data during disconnect reliably causes kernel oops/panic, and the attacker can repeat unbind/rebind to re-trigger the crash."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-08T15:13:22.712Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/aa1d005927db38af783c1a4a8a00a39e0229ab2d"
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          "url": "https://git.kernel.org/stable/c/a02e1d8f191324583599544d54e59e6a2b74bb0e"
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          "url": "https://git.kernel.org/stable/c/a3314f10369df70925140f59bbe069718f65a0b9"
        },
        {
          "url": "https://git.kernel.org/stable/c/765ba1c91823a296447528791b89a6504947fd5c"
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        {
          "url": "https://git.kernel.org/stable/c/5832c55b3c824ba2fe9c36ac3c411baddcce053e"
        },
        {
          "url": "https://git.kernel.org/stable/c/c43122fef328a70045fe7621c06de6b2b8e19264"
        }
      ],
      "title": "can: esd_usb: kill anchored URBs before freeing netdevs",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64585",
    "datePublished": "2026-08-06T07:06:26.556Z",
    "dateReserved": "2026-07-19T15:36:31.798Z",
    "dateUpdated": "2026-08-08T15:13:22.712Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-08-08",
      "epss": "0.00161",
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}



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