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CVE-2026-64547 (GCVE-0-2026-64547)

Vulnerability from cvelistv5 – Published: 2026-07-27 20:10 – Updated: 2026-08-17 04:57
VLAI
Title
net: usb: net1080: validate packet_len before pad-byte access in rx_fixup
Summary
In the Linux kernel, the following vulnerability has been resolved: net: usb: net1080: validate packet_len before pad-byte access in rx_fixup For an even packet_len, net1080_rx_fixup() reads the pad byte at skb->data[packet_len] before the skb->len != packet_len check further down, and packet_len is only bounded against NC_MAX_PACKET. A malicious NetChip 1080 device can send a short frame advertising a large even packet_len (e.g. 0x4000), so the pad-byte read lands past the end of the skb: BUG: KASAN: slab-out-of-bounds in net1080_rx_fixup Read of size 1 at addr ffff8880106c83c6 by task ksoftirqd/0/14 ... net1080_rx_fixup (drivers/net/usb/net1080.c:384) usbnet_bh (drivers/net/usb/usbnet.c:1589) process_one_work (kernel/workqueue.c:3322) bh_worker (kernel/workqueue.c:3708) tasklet_action (kernel/softirq.c:965) handle_softirqs (kernel/softirq.c:622) ... Reject the frame when packet_len >= skb->len before reading.
Severity
8.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 904813cd8a0b334189da285bb05af0b18b062502 , < f42217fa7d535e9ec4151f7971f06f6ea65e850a (git)
Affected: 904813cd8a0b334189da285bb05af0b18b062502 , < c087749815379e9af2fdbeb08bfc33870b103958 (git)
Affected: 904813cd8a0b334189da285bb05af0b18b062502 , < e4a87126c085b097d29e17e3b7647295bba8be7c (git)
Affected: 904813cd8a0b334189da285bb05af0b18b062502 , < 685e92934f11d5e215dad58813e2f9955ac2f436 (git)
Affected: 904813cd8a0b334189da285bb05af0b18b062502 , < 4dc8484be3302d187274364820d3bef6c62bde32 (git)
Affected: 904813cd8a0b334189da285bb05af0b18b062502 , < b153cfe84b1340c69a13d0957665a2bfcf21239c (git)
Affected: 904813cd8a0b334189da285bb05af0b18b062502 , < ea866cab12db1a2100b400a8b03569e5bc0ee29a (git)
Affected: 904813cd8a0b334189da285bb05af0b18b062502 , < 03f384bc0cb8d4a1301d4f5b0baef2d980258383 (git)
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Linux Linux Affected: 2.6.14
Unaffected: 0 , < 2.6.14 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (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 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: net1080: validate packet_len before pad-byte access in rx_fixup\n\nFor an even packet_len, net1080_rx_fixup() reads the pad byte at\nskb-\u003edata[packet_len] before the skb-\u003elen != packet_len check further\ndown, and packet_len is only bounded against NC_MAX_PACKET. A malicious\nNetChip 1080 device can send a short frame advertising a large even\npacket_len (e.g. 0x4000), so the pad-byte read lands past the end of the\nskb:\n\n  BUG: KASAN: slab-out-of-bounds in net1080_rx_fixup\n  Read of size 1 at addr ffff8880106c83c6 by task ksoftirqd/0/14\n   ...\n   net1080_rx_fixup (drivers/net/usb/net1080.c:384)\n   usbnet_bh (drivers/net/usb/usbnet.c:1589)\n   process_one_work (kernel/workqueue.c:3322)\n   bh_worker (kernel/workqueue.c:3708)\n   tasklet_action (kernel/softirq.c:965)\n   handle_softirqs (kernel/softirq.c:622)\n   ...\n\nReject the frame when packet_len \u003e= skb-\u003elen before reading."
        }
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              "value": "AV:A - net1080 implements a point-to-point Ethernet link over a USB host-to-host cable, so the malformed NC frame originates from the logically adjacent peer host/device on that link rather than from a local user; a compromised peer (or a gadget-mode board presenting 0525:1080, which autoloads the default-y driver) sends the frame over an already-established link with no physical interaction at attack time.\nAC:L - The attacker fully and deterministically controls packet_len and the frame length in every received frame, so the out-of-bounds read is triggered on demand with no race, no timing dependency, and no reliance on memory layout the attacker cannot influence.\nPR:N - The rx path runs in softirq/workqueue context on every received URB with no authentication, no capability check, and no local account on the target; USB/link-level peers are entirely untrusted and ungated.\nUI:N - The driver binds automatically via MODULE_DEVICE_TABLE and processes frames in usbnet_bh without any user action; on an already-connected host-to-host cable the victim does nothing at all.\nS:U - The out-of-bounds read stays within the kernel\u0027s own memory and security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The attacker controls the read offset across a ~32 KB range past a 1523-byte slab/page-frag object, and the comparison outcome is leaked back over the wire because only the matching path reaches nc_ensure_sync()\u0027s vendor control transfer, yielding a repeatable oracle for probing kernel heap contents rather than a bounded few-byte read.\nI:N - The path performs only a one-byte read; the subsequent skb-\u003elen != packet_len check still rejects the frame, and the skb_trim calls on the underflow paths are no-ops, so no kernel memory or network data is modified.\nA:H - The read reaches roughly 31 KB beyond the allocation, which can cross into a KFENCE guard page, an unmapped hole, or a page-frag boundary and oops in softirq context, and on KASAN/panic_on_warn hardened kernels it panics the machine outright \u2014 repeatable per frame."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "dateReserved": "2026-07-19T15:36:31.795Z",
    "dateUpdated": "2026-08-17T04:57:24.361Z",
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A malicious\\nNetChip 1080 device can send a short frame advertising a large even\\npacket_len (e.g. 0x4000), so the pad-byte read lands past the end of the\\nskb:\\n\\n  BUG: KASAN: slab-out-of-bounds in net1080_rx_fixup\\n  Read of size 1 at addr ffff8880106c83c6 by task ksoftirqd/0/14\\n   ...\\n   net1080_rx_fixup (drivers/net/usb/net1080.c:384)\\n   usbnet_bh (drivers/net/usb/usbnet.c:1589)\\n   process_one_work (kernel/workqueue.c:3322)\\n   bh_worker (kernel/workqueue.c:3708)\\n   tasklet_action (kernel/softirq.c:965)\\n   handle_softirqs (kernel/softirq.c:622)\\n   ...\\n\\nReject the frame when packet_len \u003e= skb-\u003elen before 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T08:28:37+00:00",
      "cve": "CVE-2026-64547",
      "id": "CVE-2026-64547",
      "initial_release_date": "2026-07-27T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: usb: net1080: validate packet_len before pad-byte access in rx_fixup",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64547.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:46:09Z",
      "cve": "CVE-2026-64547",
      "id": "CVE-2026-64547",
      "initial_release_date": "2026-07-28T17:07:58Z",
      "product_status:first_fixed": "88",
      "product_status:known_affected": "675",
      "product_status:known_not_affected": "74",
      "product_status:recommended": "46",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64547",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64547.json",
      "version": "9"
    }
  }
}



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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.