{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-43883", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-43883" ], "published": "2024-08-23T13:08:27Z", "summary": "usb: vhci-hcd: Do not drop references before new references are gained", "details": "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.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.21-1+rpt1", "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1", "1:6.6.31-1+rpt1" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.1.0-rpi1-rpi-v6", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7l", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v8", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi2-rpi-v6", "binary_version": "1:6.1.47-1+rpt2" }, { 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"https://git.kernel.org/stable/c/5a3c473b28ae1c1f7c4dc129e30cb19ae6e96f89" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/9c3746ce8d8fcb3a2405644fc0eec7fc5312de80" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/4dacdb9720aaab10b6be121eae55820174d97174" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/e8c1e606dab8c56cf074b43b98d0805de7322ba2" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/585e6bc7d0a9bf73a8be3d3fb34e86b90cc61a14" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/128e82e41cf7d74a562726c1587d9d2ede1a0a37" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/c3d0857b7fc2c49f68f89128a5440176089a8f54" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/afdcfd3d6fcdeca2735ca8d994c5f2d24a368f0a" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T11:52:36Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 9.8, "cvss_v3_severity": "Critical", "scenario": "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->udev` 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->dev.driver`, `udev->bus`, 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->udev` can also be observed as NULL/freed by concurrent readers. The remote peer can trigger this repeatedly, making a reliable kernel crash trivial." } } }