can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error

{
  "id": "65774ab36235dff0c8370bc9cd98f7e288c0d2f1e2bc93880219be7281817156",
  "url": "https://osv.dev/vulnerability/CVE-2026-74456",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error In peak_usb_start(), each RX URB transfer buffer is allocated with kmalloc() and the URB is flagged URB_FREE_BUFFER so that the final usb_free_urb() also frees the transfer buffer. If usb_submit_urb() fails, the error path frees the buffer explicitly with kfree(buf) and then calls usb_free_urb(urb). Because URB_FREE_BUFFER is set, usb_free_urb() -> urb_destroy() frees the same buffer a second time, a double free of the transfer buffer. BUG: KASAN: double-free in usb_free_urb.part.0+0x91/0xb0 Free of addr ffff8881069ccb80 by task trigger.sh/285 Call Trace: kfree+0x113/0x3c0 usb_free_urb.part.0+0x91/0xb0 Drop the redundant kfree(buf); usb_free_urb() already releases the transfer buffer. This mirrors commit 03819abbeb11 (\"net: usb: lan78xx: Fix double free issue with interrupt buffer allocation\").",
    "evidence": "osv:CVE-2026-74456",
    "products": [
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      "modified": "2026-10-28T02:30:40.196757174Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/4bb3325075138dd5346b71589a959878b564dc0b",
        "https://git.kernel.org/stable/c/525640b93d3e5f82f4ebea4730f4e0cf799522ba",
        "https://git.kernel.org/stable/c/5f2fa5840c34d3a558c57855781be75e03bef752",
        "https://git.kernel.org/stable/c/914c3b8fa175acf8476ad31cf04e308638e3578e",
        "https://git.kernel.org/stable/c/92d0de80ca2223b9c7da78020155b6cb27824cc0",
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        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74456.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-74456",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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        "cna_assigner": "Linux",
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    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 507807,
  "published_at": "2026-08-15T12:26:58.808+00:00"
}