CVE-2026-74456 (GCVE-0-2026-74456)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:26 – Updated: 2026-08-19 16:36
VLAI
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").
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 CPE status
Linux Linux Affected: bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d , < 914c3b8fa175acf8476ad31cf04e308638e3578e (git)
Affected: bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d , < 5f2fa5840c34d3a558c57855781be75e03bef752 (git)
Affected: bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d , < b9088d581fff971a7eb1628f8dcc30df6cfef4dc (git)
Affected: bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d , < 525640b93d3e5f82f4ebea4730f4e0cf799522ba (git)
Affected: bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d , < 4bb3325075138dd5346b71589a959878b564dc0b (git)
Affected: bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d , < 92d0de80ca2223b9c7da78020155b6cb27824cc0 (git)
Affected: bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d , < dfb17bf04a764462000f11258a7c06aa92d1f261 (git)
Affected: bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d , < 9b3d5a6d952c38bbcf07f903cbeadefdb56b9bc9 (git)
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Linux Linux Affected: 3.4
Unaffected: 0 , < 3.4 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error\n\nIn peak_usb_start(), each RX URB transfer buffer is allocated with kmalloc()\nand the URB is flagged URB_FREE_BUFFER so that the final usb_free_urb() also\nfrees the transfer buffer.\n\nIf usb_submit_urb() fails, the error path frees the buffer explicitly with\nkfree(buf) and then calls usb_free_urb(urb). Because URB_FREE_BUFFER is set,\nusb_free_urb() -\u003e urb_destroy() frees the same buffer a second time, a double\nfree of the transfer buffer.\n\n  BUG: KASAN: double-free in usb_free_urb.part.0+0x91/0xb0\n  Free of addr ffff8881069ccb80 by task trigger.sh/285\n\n  Call Trace:\n   kfree+0x113/0x3c0\n   usb_free_urb.part.0+0x91/0xb0\n\nDrop the redundant kfree(buf); usb_free_urb() already releases the transfer\nbuffer. This mirrors commit 03819abbeb11 (\"net: usb: lan78xx: Fix double free\nissue with interrupt buffer allocation\")."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
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            "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 flaw is only reached when a privileged local actor brings the PEAK CAN netdev up via rtnetlink/ioctl (peak_usb_ndo_open\u2192peak_usb_start); CAN-bus traffic and remote protocols never call this setup path, but the entry is a local syscall rather than USB packet processing.\nAC:L - Any usb_submit_urb() failure on RX setup deterministically hits the broken error path; an attacker can reliably force -ENODEV/-ENOENT by disconnecting/resetting the adapter or presenting a rogue PEAK-class gadget while repeatedly running ip link set canX up/down.\nPR:L - Bringing the CAN interface up requires CAP_NET_ADMIN on RTM_SETLINK (rtnl_setlink/netif_open), which is Low under CNA guidance; on automotive/industrial diagnostic hosts this is commonly held by technician/service accounts even though unauthenticated remote attackers cannot reach the path.\nUI:N - No separate victim interaction is needed beyond the attacker (or their malware) issuing the privileged link-up that enters peak_usb_start; they can also script repeated up/down cycles while manipulating USB state themselves.\nS:U - The double-free corrupts host kernel kmalloc slab state within the peak_usb driver scope and does not by itself cross a security boundary such as VM escape, container breakout, or IOMMU bypass.\nC:H - This is a kmalloc RX-buffer double-free with URB_FREE_BUFFER set; per CNA guidance such heap double-free/UAF-class bugs enable controlled reallocation and arbitrary kernel memory disclosure, not merely a bounded leak.\nI:H - Freeing the same 64\u20132048 byte RX slab object twice corrupts SLUB freelist/metadata and provides a standard heap corruption primitive that can be groomed into arbitrary kernel writes or control-flow hijacking.\nA:H - KASAN already reports a double-free in usb_free_urb() on this path; even without full exploitation, allocator corruption typically causes kernel BUG/oops/panic and repeated trigger cycles can deny CAN/USB service on shared diagnostic systems."
            }
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        }
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        "dateUpdated": "2026-08-19T16:36:51.237Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/914c3b8fa175acf8476ad31cf04e308638e3578e"
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          "url": "https://git.kernel.org/stable/c/5f2fa5840c34d3a558c57855781be75e03bef752"
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        {
          "url": "https://git.kernel.org/stable/c/9b3d5a6d952c38bbcf07f903cbeadefdb56b9bc9"
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      ],
      "title": "can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error",
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    "datePublished": "2026-08-15T12:26:58.808Z",
    "dateReserved": "2026-08-15T05:44:03.900Z",
    "dateUpdated": "2026-08-19T16:36:51.237Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-74456",
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      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74456.json",
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Because URB_FREE_BUFFER is set,\\nusb_free_urb() -\u003e urb_destroy() frees the same buffer a second time, a double\\nfree of the transfer buffer.\\n\\n  BUG: KASAN: double-free in usb_free_urb.part.0+0x91/0xb0\\n  Free of addr ffff8881069ccb80 by task trigger.sh/285\\n\\n  Call Trace:\\n   kfree+0x113/0x3c0\\n   usb_free_urb.part.0+0x91/0xb0\\n\\nDrop the redundant kfree(buf); usb_free_urb() already releases the transfer\\nbuffer. This mirrors commit 03819abbeb11 (\\\"net: usb: lan78xx: Fix double free\\nissue with interrupt buffer allocation\\\").\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/can/usb/peak_usb/pcan_usb_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d\",\"lessThan\":\"914c3b8fa175acf8476ad31cf04e308638e3578e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d\",\"lessThan\":\"5f2fa5840c34d3a558c57855781be75e03bef752\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d\",\"lessThan\":\"b9088d581fff971a7eb1628f8dcc30df6cfef4dc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d\",\"lessThan\":\"525640b93d3e5f82f4ebea4730f4e0cf799522ba\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d\",\"lessThan\":\"4bb3325075138dd5346b71589a959878b564dc0b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d\",\"lessThan\":\"92d0de80ca2223b9c7da78020155b6cb27824cc0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d\",\"lessThan\":\"dfb17bf04a764462000f11258a7c06aa92d1f261\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d\",\"lessThan\":\"9b3d5a6d952c38bbcf07f903cbeadefdb56b9bc9\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/can/usb/peak_usb/pcan_usb_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.4\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.4\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4bb3325075138dd5346b71589a959878b564dc0b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/525640b93d3e5f82f4ebea4730f4e0cf799522ba\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5f2fa5840c34d3a558c57855781be75e03bef752\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/914c3b8fa175acf8476ad31cf04e308638e3578e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/92d0de80ca2223b9c7da78020155b6cb27824cc0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9b3d5a6d952c38bbcf07f903cbeadefdb56b9bc9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b9088d581fff971a7eb1628f8dcc30df6cfef4dc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dfb17bf04a764462000f11258a7c06aa92d1f261\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T14:19:28+00:00",
      "cve": "CVE-2026-74456",
      "id": "CVE-2026-74456",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74456.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.