CVE-2026-31607 (GCVE-0-2026-31607)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-06-14 17:42
VLAI
Title
usbip: validate number_of_packets in usbip_pack_ret_submit()
Summary
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, so we can use the tighter bound: the response must not exceed the original number_of_packets. This mirrors the existing validation of actual_length against transfer_buffer_length in usbip_recv_xbuff(), which checks the response value against the original allocation size. Kelvin Mbogo's series ("usb: usbip: fix integer overflow in usbip_recv_iso()", v2) hardens the receive-side functions themselves; this patch complements that work by catching the bad value at its source -- in usbip_pack_ret_submit() before the overwrite -- and using the tighter per-URB allocation bound rather than the global USBIP_MAX_ISO_PACKETS limit. Fix this by checking rpdu->number_of_packets against urb->number_of_packets in usbip_pack_ret_submit() before the overwrite. On violation, clamp to zero so that usbip_recv_iso() and usbip_pad_iso() safely return early.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1325f85fa49f57df034869de430f7c302ae23109 , < 324262c38438255bf6bdbf6342ca47c0badaab76 (git)
Affected: 1325f85fa49f57df034869de430f7c302ae23109 , < 973f2c250289f5bf6cc146b98aa6fdde11fe50d6 (git)
Affected: 1325f85fa49f57df034869de430f7c302ae23109 , < ce744264b06b97069b3722511ab355738311fee0 (git)
Affected: 1325f85fa49f57df034869de430f7c302ae23109 , < 885c8591784da6314f9aa82fa460ac69f9f79e5f (git)
Affected: 1325f85fa49f57df034869de430f7c302ae23109 , < 8d155e2d1c4102f74f82a2bf9c016164bb0f7384 (git)
Affected: 1325f85fa49f57df034869de430f7c302ae23109 , < 906f16a836de13fe61f49cdce2f66f2dbd14caf4 (git)
Affected: 1325f85fa49f57df034869de430f7c302ae23109 , < ef8ebb1c637b4cfb61a9dd2e013376774ee2033b (git)
Affected: 1325f85fa49f57df034869de430f7c302ae23109 , < 5e1c4ece08ccdc197177631f111845a2c68eede3 (git)
Affected: 1325f85fa49f57df034869de430f7c302ae23109 , < 2ab833a16a825373aad2ba7d54b572b277e95b71 (git)
Affected: d9638d9236eed035a575feddec61d036dacc2676 (git)
Affected: ca7d3501b7a287c18b5b470e871d3029b0f4842a (git)
Affected: 1ce528277e1a66856ed3f7526c1e3458c0ed4a70 (git)
Affected: db898d0c5c493ce4177d5e1d3a953e079a56a24b (git)
Affected: 5aa02704b9ee67c5b2ee26d54c5f4eb99e93ba9a (git)
Affected: 2.6.32.37 , < 2.6.33 (semver)
Affected: 2.6.33.10 , < 2.6.34 (semver)
Affected: 2.6.34.11 , < 2.6.35 (semver)
Affected: 2.6.35.13 , < 2.6.36 (semver)
Affected: 2.6.38.3 , < 2.6.39 (semver)
Create a notification for this product.
Linux Linux Affected: 2.6.39
Unaffected: 0 , < 2.6.39 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusbip: validate number_of_packets in usbip_pack_ret_submit()\n\nWhen a USB/IP client receives a RET_SUBMIT response,\nusbip_pack_ret_submit() unconditionally overwrites\nurb-\u003enumber_of_packets from the network PDU. This value is\nsubsequently used as the loop bound in usbip_recv_iso() and\nusbip_pad_iso() to iterate over urb-\u003eiso_frame_desc[], a flexible\narray whose size was fixed at URB allocation time based on the\n*original* number_of_packets from the CMD_SUBMIT.\n\nA malicious USB/IP server can set number_of_packets in the response\nto a value larger than what was originally submitted, causing a heap\nout-of-bounds write when usbip_recv_iso() writes to\nurb-\u003eiso_frame_desc[i] beyond the allocated region.\n\nKASAN confirmed this with kernel 7.0.0-rc5:\n\n  BUG: KASAN: slab-out-of-bounds in usbip_recv_iso+0x46a/0x640\n  Write of size 4 at addr ffff888106351d40 by task vhci_rx/69\n\n  The buggy address is located 0 bytes to the right of\n   allocated 320-byte region [ffff888106351c00, ffff888106351d40)\n\nThe server side (stub_rx.c) and gadget side (vudc_rx.c) already\nvalidate number_of_packets in the CMD_SUBMIT path since commits\nc6688ef9f297 (\"usbip: fix stub_rx: harden CMD_SUBMIT path to handle\nmalicious input\") and b78d830f0049 (\"usbip: fix vudc_rx: harden\nCMD_SUBMIT path to handle malicious input\"). The server side validates\nagainst USBIP_MAX_ISO_PACKETS because no URB exists yet at that point.\nOn the client side we have the original URB, so we can use the tighter\nbound: the response must not exceed the original number_of_packets.\n\nThis mirrors the existing validation of actual_length against\ntransfer_buffer_length in usbip_recv_xbuff(), which checks the\nresponse value against the original allocation size.\n\nKelvin Mbogo\u0027s series (\"usb: usbip: fix integer overflow in\nusbip_recv_iso()\", v2) hardens the receive-side functions themselves;\nthis patch complements that work by catching the bad value at its\nsource -- in usbip_pack_ret_submit() before the overwrite -- and\nusing the tighter per-URB allocation bound rather than the global\nUSBIP_MAX_ISO_PACKETS limit.\n\nFix this by checking rpdu-\u003enumber_of_packets against\nurb-\u003enumber_of_packets in usbip_pack_ret_submit() before the\noverwrite. On violation, clamp to zero so that usbip_recv_iso() and\nusbip_pad_iso() safely return early."
        }
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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        "dateUpdated": "2026-06-14T17:42:48.408Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/973f2c250289f5bf6cc146b98aa6fdde11fe50d6"
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        {
          "url": "https://git.kernel.org/stable/c/ce744264b06b97069b3722511ab355738311fee0"
        },
        {
          "url": "https://git.kernel.org/stable/c/885c8591784da6314f9aa82fa460ac69f9f79e5f"
        },
        {
          "url": "https://git.kernel.org/stable/c/8d155e2d1c4102f74f82a2bf9c016164bb0f7384"
        },
        {
          "url": "https://git.kernel.org/stable/c/906f16a836de13fe61f49cdce2f66f2dbd14caf4"
        },
        {
          "url": "https://git.kernel.org/stable/c/ef8ebb1c637b4cfb61a9dd2e013376774ee2033b"
        },
        {
          "url": "https://git.kernel.org/stable/c/5e1c4ece08ccdc197177631f111845a2c68eede3"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ab833a16a825373aad2ba7d54b572b277e95b71"
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      ],
      "title": "usbip: validate number_of_packets in usbip_pack_ret_submit()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31607",
    "datePublished": "2026-04-24T14:42:29.468Z",
    "dateReserved": "2026-03-09T15:48:24.122Z",
    "dateUpdated": "2026-06-14T17:42:48.408Z",
    "state": "PUBLISHED"
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This value is\\nsubsequently used as the loop bound in usbip_recv_iso() and\\nusbip_pad_iso() to iterate over urb-\u003eiso_frame_desc[], a flexible\\narray whose size was fixed at URB allocation time based on the\\n*original* number_of_packets from the CMD_SUBMIT.\\n\\nA malicious USB/IP server can set number_of_packets in the response\\nto a value larger than what was originally submitted, causing a heap\\nout-of-bounds write when usbip_recv_iso() writes to\\nurb-\u003eiso_frame_desc[i] beyond the allocated region.\\n\\nKASAN confirmed this with kernel 7.0.0-rc5:\\n\\n  BUG: KASAN: slab-out-of-bounds in usbip_recv_iso+0x46a/0x640\\n  Write of size 4 at addr ffff888106351d40 by task vhci_rx/69\\n\\n  The buggy address is located 0 bytes to the right of\\n   allocated 320-byte region [ffff888106351c00, ffff888106351d40)\\n\\nThe server side (stub_rx.c) and gadget side (vudc_rx.c) already\\nvalidate number_of_packets in the CMD_SUBMIT path since commits\\nc6688ef9f297 (\\\"usbip: fix stub_rx: harden CMD_SUBMIT path to handle\\nmalicious input\\\") and b78d830f0049 (\\\"usbip: fix vudc_rx: harden\\nCMD_SUBMIT path to handle malicious input\\\"). The server side validates\\nagainst USBIP_MAX_ISO_PACKETS because no URB exists yet at that point.\\nOn the client side we have the original URB, so we can use the tighter\\nbound: the response must not exceed the original number_of_packets.\\n\\nThis mirrors the existing validation of actual_length against\\ntransfer_buffer_length in usbip_recv_xbuff(), which checks the\\nresponse value against the original allocation size.\\n\\nKelvin Mbogo\u0027s series (\\\"usb: usbip: fix integer overflow in\\nusbip_recv_iso()\\\", v2) hardens the receive-side functions themselves;\\nthis patch complements that work by catching the bad value at its\\nsource -- in usbip_pack_ret_submit() before the overwrite -- and\\nusing the tighter per-URB allocation bound rather than the global\\nUSBIP_MAX_ISO_PACKETS limit.\\n\\nFix this by checking rpdu-\u003enumber_of_packets against\\nurb-\u003enumber_of_packets in usbip_pack_ret_submit() before the\\noverwrite. On violation, clamp to zero so that usbip_recv_iso() and\\nusbip_pad_iso() safely return early.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-787\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.39\",\"versionEndExcluding\":\"6.6.136\",\"matchCriteriaId\":\"860F82EF-76BF-492E-B7CE-559EC99F9C95\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.83\",\"matchCriteriaId\":\"7F0AE5B5-23AC-4DCC-B37A-51CA1DAE7BA8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.24\",\"matchCriteriaId\":\"8126B8B8-6D0B-4443-86C1-672AEE893555\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.14\",\"matchCriteriaId\":\"D6A8A074-BBF4-4803-ABED-519A839435BB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"7.0\",\"versionEndExcluding\":\"7.0.1\",\"matchCriteriaId\":\"9B5888AB-7403-4335-89E4-21CC0B48366A\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2ab833a16a825373aad2ba7d54b572b277e95b71\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/324262c38438255bf6bdbf6342ca47c0badaab76\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5e1c4ece08ccdc197177631f111845a2c68eede3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/885c8591784da6314f9aa82fa460ac69f9f79e5f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8d155e2d1c4102f74f82a2bf9c016164bb0f7384\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/906f16a836de13fe61f49cdce2f66f2dbd14caf4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/973f2c250289f5bf6cc146b98aa6fdde11fe50d6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ce744264b06b97069b3722511ab355738311fee0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ef8ebb1c637b4cfb61a9dd2e013376774ee2033b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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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.