CVE-2024-43883 (GCVE-0-2024-43883)
Vulnerability from cvelistv5
Published
2024-08-23 13:08
Modified
2026-08-05 11:36
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: vhci-hcd: Do not drop references before new references are gained At a few places the driver carries stale pointers to references that can still be used. Make sure that does not happen. This strictly speaking closes ZDI-CAN-22273, though there may be similar races in the driver.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7606ee8aa33287dd3e6eb44c78541b87a413a325
Version: 7606ee8aa33287dd3e6eb44c78541b87a413a325
Version: 7606ee8aa33287dd3e6eb44c78541b87a413a325
Version: 7606ee8aa33287dd3e6eb44c78541b87a413a325
Version: 7606ee8aa33287dd3e6eb44c78541b87a413a325
Version: 7606ee8aa33287dd3e6eb44c78541b87a413a325
Version: 7606ee8aa33287dd3e6eb44c78541b87a413a325
Version: 7606ee8aa33287dd3e6eb44c78541b87a413a325
Version: 96ea4801d2035f89fc4ec4a67f49a18c35cb6715
Version: 075b4e6a982d38121250c090f7b9294314ac1b19
Version: 436e52f1a628233f080605dd736594df250897ca
Version: 1c8d316294916da7e2a2f1f178ca3f3bd6d7b531
Version: 927c3fa44e24300eb827ab9f9dacce6dff9c9bb7
Version: 2.6.32.30   ≤
Version: 2.6.33.8   ≤
Version: 2.6.34.10   ≤
Version: 2.6.35.12   ≤
Version: 2.6.37.3   ≤
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: vhci-hcd: Do not drop references before new references are gained\n\nAt a few places the driver carries stale pointers\nto references that can still be used. Make sure that does not happen.\nThis strictly speaking closes ZDI-CAN-22273, though there may be\nsimilar races in the driver."
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              "value": "AV:N - vhci-hcd is a virtual host controller whose transport is an unauthenticated TCP socket, not a physical port; `vhci_rx_pdu()` processes attacker-supplied PDUs from the remote USB/IP peer and converts a malformed command or short read directly into `VDEV_EVENT_ERROR_TCP` \u2192 `vhci_device_reset()`, the vulnerable put path. A malicious or compromised USB/IP server (or an on-path attacker, since USB/IP has no integrity protection) drives the bug entirely over the network.\nAC:L - The attacker controls both sides of the race \u2014 it forces unlimited re-enumerations by failing URBs (usb-storage error recovery and hub retry loops re-issue SET_ADDRESS/GET_DESCRIPTOR to devnum 0) and fires the reset event on demand with a single bad PDU byte. It also observes the GET_DESCRIPTOR-to-device-0 CMD_SUBMIT on the wire, so it knows precisely when the put/assign window opens, and can retry indefinitely.\nPR:N - The USB/IP client performs no authentication on received PDUs \u2014 `vhci_rx_loop()` just reads and dispatches whatever the peer sends, so the remote attacker needs no credentials on the target. Even in the local framing, `USBDEVFS_RESET` is gated only on `FMODE_WRITE` of the usbfs node with no capability check.\nUI:N - In the targeted deployments (thin clients, VDI USB redirection, device farms, industrial gateways) the attachment is established automatically by a service, and the attacker triggers both re-enumeration and the reset event itself during normal operation. No victim action is required at attack time.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The double `usb_put_dev()` frees a live `struct usb_device` while `vdev-\u003eudev` and in-flight URBs still reference it, and the remote controls RET_SUBMIT buffer contents/sizes for reliable slab reclaim, yielding an arbitrary read primitive. `port_show_vhci()` additionally prints `dev_name()` from the freed object into `/sys/devices/platform/vhci_hcd.0/status`, directly leaking reclaimed heap content.\nI:H - After the premature free, `usb_get_dev()` performs a refcount increment into freed memory (a write at a controlled offset), and subsequent dereferences of `udev-\u003edev.driver`, `udev-\u003ebus`, and the kobject release path give function-pointer control. This is a classic UAF exploitable for heap corruption and control-flow hijack to kernel code execution.\nA:H - The reference-count underflow and stale-pointer dereference produce refcount_t warnings, oopses, and panics, and `vdev-\u003eudev` can also be observed as NULL/freed by concurrent readers. The remote peer can trigger this repeatedly, making a reliable kernel crash trivial."
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    "cveId": "CVE-2024-43883",
    "datePublished": "2024-08-23T13:08:10.508Z",
    "dateReserved": "2024-08-17T09:11:59.287Z",
    "dateUpdated": "2026-08-05T11:36:58.793Z",
    "state": "PUBLISHED"
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A malicious or compromised USB/IP server (or an on-path attacker, since USB/IP has no integrity protection) drives the bug entirely over the network.\\nAC:L - The attacker controls both sides of the race \\u2014 it forces unlimited re-enumerations by failing URBs (usb-storage error recovery and hub retry loops re-issue SET_ADDRESS/GET_DESCRIPTOR to devnum 0) and fires the reset event on demand with a single bad PDU byte. It also observes the GET_DESCRIPTOR-to-device-0 CMD_SUBMIT on the wire, so it knows precisely when the put/assign window opens, and can retry indefinitely.\\nPR:N - The USB/IP client performs no authentication on received PDUs \\u2014 `vhci_rx_loop()` just reads and dispatches whatever the peer sends, so the remote attacker needs no credentials on the target. Even in the local framing, `USBDEVFS_RESET` is gated only on `FMODE_WRITE` of the usbfs node with no capability check.\\nUI:N - In the targeted deployments (thin clients, VDI USB redirection, device farms, industrial gateways) the attachment is established automatically by a service, and the attacker triggers both re-enumeration and the reset event itself during normal operation. No victim action is required at attack time.\\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\\nC:H - The double `usb_put_dev()` frees a live `struct usb_device` while `vdev-\u003eudev` and in-flight URBs still reference it, and the remote controls RET_SUBMIT buffer contents/sizes for reliable slab reclaim, yielding an arbitrary read primitive. `port_show_vhci()` additionally prints `dev_name()` from the freed object into `/sys/devices/platform/vhci_hcd.0/status`, directly leaking reclaimed heap content.\\nI:H - After the premature free, `usb_get_dev()` performs a refcount increment into freed memory (a write at a controlled offset), and subsequent dereferences of `udev-\u003edev.driver`, `udev-\u003ebus`, and the kobject release path give function-pointer control. This is a classic UAF exploitable for heap corruption and control-flow hijack to kernel code execution.\\nA:H - The reference-count underflow and stale-pointer dereference produce refcount_t warnings, oopses, and panics, and `vdev-\u003eudev` can also be observed as NULL/freed by concurrent readers. The remote peer can trigger this repeatedly, making a reliable kernel crash trivial.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"7606ee8aa33287dd3e6eb44c78541b87a413a325\", \"lessThan\": \"5a3c473b28ae1c1f7c4dc129e30cb19ae6e96f89\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7606ee8aa33287dd3e6eb44c78541b87a413a325\", \"lessThan\": \"9c3746ce8d8fcb3a2405644fc0eec7fc5312de80\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7606ee8aa33287dd3e6eb44c78541b87a413a325\", \"lessThan\": \"4dacdb9720aaab10b6be121eae55820174d97174\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7606ee8aa33287dd3e6eb44c78541b87a413a325\", \"lessThan\": \"e8c1e606dab8c56cf074b43b98d0805de7322ba2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7606ee8aa33287dd3e6eb44c78541b87a413a325\", \"lessThan\": \"585e6bc7d0a9bf73a8be3d3fb34e86b90cc61a14\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7606ee8aa33287dd3e6eb44c78541b87a413a325\", \"lessThan\": \"128e82e41cf7d74a562726c1587d9d2ede1a0a37\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7606ee8aa33287dd3e6eb44c78541b87a413a325\", \"lessThan\": \"c3d0857b7fc2c49f68f89128a5440176089a8f54\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7606ee8aa33287dd3e6eb44c78541b87a413a325\", \"lessThan\": \"afdcfd3d6fcdeca2735ca8d994c5f2d24a368f0a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"96ea4801d2035f89fc4ec4a67f49a18c35cb6715\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"075b4e6a982d38121250c090f7b9294314ac1b19\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"436e52f1a628233f080605dd736594df250897ca\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1c8d316294916da7e2a2f1f178ca3f3bd6d7b531\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"927c3fa44e24300eb827ab9f9dacce6dff9c9bb7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2.6.32.30\", \"lessThan\": \"2.6.33\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"2.6.33.8\", \"lessThan\": \"2.6.34\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"2.6.34.10\", \"lessThan\": \"2.6.35\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"2.6.35.12\", \"lessThan\": \"2.6.36\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"2.6.37.3\", \"lessThan\": \"2.6.38\", \"versionType\": \"semver\"}], \"programFiles\": [\"drivers/usb/usbip/vhci_hcd.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.38\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.38\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.320\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.282\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.224\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.165\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.105\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.46\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/usb/usbip/vhci_hcd.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/5a3c473b28ae1c1f7c4dc129e30cb19ae6e96f89\"}, {\"url\": \"https://git.kernel.org/stable/c/9c3746ce8d8fcb3a2405644fc0eec7fc5312de80\"}, {\"url\": \"https://git.kernel.org/stable/c/4dacdb9720aaab10b6be121eae55820174d97174\"}, {\"url\": \"https://git.kernel.org/stable/c/e8c1e606dab8c56cf074b43b98d0805de7322ba2\"}, {\"url\": \"https://git.kernel.org/stable/c/585e6bc7d0a9bf73a8be3d3fb34e86b90cc61a14\"}, {\"url\": \"https://git.kernel.org/stable/c/128e82e41cf7d74a562726c1587d9d2ede1a0a37\"}, {\"url\": \"https://git.kernel.org/stable/c/c3d0857b7fc2c49f68f89128a5440176089a8f54\"}, {\"url\": \"https://git.kernel.org/stable/c/afdcfd3d6fcdeca2735ca8d994c5f2d24a368f0a\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nusb: vhci-hcd: Do not drop references before new references are gained\\n\\nAt a few places the driver carries stale pointers\\nto references that can still be used. Make sure that does not happen.\\nThis strictly speaking closes ZDI-CAN-22273, though there may be\\nsimilar races in the driver.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.320\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.282\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.224\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.165\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.105\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.46\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.5\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"2.6.32.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"2.6.33.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"2.6.34.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"2.6.35.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"2.6.37.3\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:36:58.793Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-43883\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:36:58.793Z\", \"dateReserved\": \"2024-08-17T09:11:59.287Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-08-23T13:08:10.508Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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