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usbip: validate number_of_packets in usbip_pack_ret_submit()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: usbip: validate number_of_packets in usbip_pack_ret_submit() When a USB/IP client receives a RET_SUBMIT response, usbip_pack_ret_submit() unconditionally overwrites urb->number_of_packets from the network PDU. This value is subsequently used as the loop bound in usbip_recv_iso() and usbip_pad_iso() to iterate over urb->iso_frame_desc[], a flexible array whose size was fixed at URB allocation time based on the *original* number_of_packets from the CMD_SUBMIT. A malicious USB/IP server can set number_of_packets in the response to a value larger than what was originally submitted, causing a heap out-of-bounds write when usbip_recv_iso() writes to urb->iso_frame_desc[i] beyond the allocated region. KASAN confirmed this with kernel 7.0.0-rc5: BUG: KASAN: slab-out-of-bounds in usbip_recv_iso+0x46a/0x640 Write of size 4 at addr ffff888106351d40 by task vhci_rx/69 The buggy address is located 0 bytes to the right of allocated 320-byte region [ffff888106351c00, ffff888106351d40) The server side (stub_rx.c) and gadget side (vudc_rx.c) already validate number_of_packets in the CMD_SUBMIT path since commits c6688ef9f297 ("usbip: fix stub_rx: harden CMD_SUBMIT path to handle malicious input") and b78d830f0049 ("usbip: fix vudc_rx: harden CMD_SUBMIT path to handle malicious input"). The server side validates against USBIP_MAX_ISO_PACKETS because no URB exists yet at that point. On the client side we have the original URB,

Announced Source revision 1
Original source ↗

CVE-2026-31607

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-31607

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
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        "status": "affected",
        "version": "1325f85fa49f57df034869de430f7c302ae23109",
        "lessThan": "324262c38438255bf6bdbf6342ca47c0badaab76",
        "versionType": "git"
      },
      {
        "status": "affected",
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      {
        "status": "affected",
        "version": "2.6.32.37",
        "lessThan": "2.6.33",
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        "status": "affected",
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    ],
    "programFiles": [
      "drivers/usb/usbip/usbip_common.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
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    "vendor": "Linux",
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        "version": "5.10.258",
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        "version": "5.15.209",
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      },
      {
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        "version": "6.1.175",
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        "lessThanOrEqual": "6.1.*"
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      {
        "status": "unaffected",
        "version": "6.6.136",
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      {
        "status": "unaffected",
        "version": "6.12.83",
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        "lessThanOrEqual": "6.12.*"
      },
      {
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        "version": "6.18.24",
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      {
        "status": "unaffected",
        "version": "6.19.14",
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        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.1",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
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        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/usb/usbip/usbip_common.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-31607

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#39929 · Revision 1
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Publisher date
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