GHSA-88MV-JF2P-HPM8
Vulnerability from github – Published: 2026-08-06 09:30 – Updated: 2026-08-23 15:32In 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.
{
"affected": [],
"aliases": [
"CVE-2026-64585"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-06T08:16:33Z",
"severity": "HIGH"
},
"details": "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.",
"id": "GHSA-88mv-jf2p-hpm8",
"modified": "2026-08-23T15:32:55Z",
"published": "2026-08-06T09:30:32Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64585"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5832c55b3c824ba2fe9c36ac3c411baddcce053e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/765ba1c91823a296447528791b89a6504947fd5c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a02e1d8f191324583599544d54e59e6a2b74bb0e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a3314f10369df70925140f59bbe069718f65a0b9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/aa1d005927db38af783c1a4a8a00a39e0229ab2d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c43122fef328a70045fe7621c06de6b2b8e19264"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d12f6add48f2da15c8c8281961d3faad804c76cf"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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