{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-43883", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-17T09:11:59.287Z", "datePublished": "2024-08-23T13:08:10.508Z", "dateUpdated": "2026-08-05T11:36:58.793Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:36:58.793Z" }, "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." } ], "metrics": [ { "cvssV3_1": { "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" }, "scenarios": [ { "lang": "en", "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` → `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 — 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 — `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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/usb/usbip/vhci_hcd.c" ], "versions": [ { "version": "7606ee8aa33287dd3e6eb44c78541b87a413a325", "lessThan": "5a3c473b28ae1c1f7c4dc129e30cb19ae6e96f89", "status": "affected", "versionType": "git" }, { "version": "7606ee8aa33287dd3e6eb44c78541b87a413a325", "lessThan": "9c3746ce8d8fcb3a2405644fc0eec7fc5312de80", "status": "affected", "versionType": "git" }, { "version": "7606ee8aa33287dd3e6eb44c78541b87a413a325", "lessThan": "4dacdb9720aaab10b6be121eae55820174d97174", "status": "affected", "versionType": "git" }, { "version": "7606ee8aa33287dd3e6eb44c78541b87a413a325", "lessThan": "e8c1e606dab8c56cf074b43b98d0805de7322ba2", "status": "affected", "versionType": "git" }, { "version": "7606ee8aa33287dd3e6eb44c78541b87a413a325", "lessThan": "585e6bc7d0a9bf73a8be3d3fb34e86b90cc61a14", "status": "affected", "versionType": "git" }, { "version": "7606ee8aa33287dd3e6eb44c78541b87a413a325", "lessThan": "128e82e41cf7d74a562726c1587d9d2ede1a0a37", "status": "affected", "versionType": "git" }, { "version": "7606ee8aa33287dd3e6eb44c78541b87a413a325", "lessThan": "c3d0857b7fc2c49f68f89128a5440176089a8f54", "status": "affected", "versionType": "git" }, { "version": "7606ee8aa33287dd3e6eb44c78541b87a413a325", "lessThan": "afdcfd3d6fcdeca2735ca8d994c5f2d24a368f0a", "status": "affected", "versionType": "git" }, { "version": "96ea4801d2035f89fc4ec4a67f49a18c35cb6715", "status": "affected", "versionType": "git" }, { "version": "075b4e6a982d38121250c090f7b9294314ac1b19", "status": "affected", "versionType": "git" }, { "version": "436e52f1a628233f080605dd736594df250897ca", "status": "affected", "versionType": "git" }, { "version": "1c8d316294916da7e2a2f1f178ca3f3bd6d7b531", "status": "affected", "versionType": "git" }, { "version": "927c3fa44e24300eb827ab9f9dacce6dff9c9bb7", "status": "affected", "versionType": "git" }, { "version": "2.6.32.30", "lessThan": "2.6.33", "status": "affected", "versionType": "semver" }, { "version": "2.6.33.8", "lessThan": "2.6.34", "status": "affected", "versionType": "semver" }, { "version": "2.6.34.10", "lessThan": "2.6.35", "status": "affected", "versionType": "semver" }, { "version": "2.6.35.12", "lessThan": "2.6.36", "status": "affected", "versionType": "semver" }, { "version": "2.6.37.3", "lessThan": "2.6.38", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/usb/usbip/vhci_hcd.c" ], "versions": [ { "version": "2.6.38", "status": "affected" }, { "version": "0", "lessThan": "2.6.38", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.320", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.282", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.224", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.165", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.105", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.46", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10.5", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "4.19.320" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "5.4.282" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "5.10.224" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "5.15.165" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "6.1.105" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "6.6.46" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "6.10.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "6.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32.30" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.33.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35.12" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37.3" } ] } ] } ], "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" } ], "title": "usb: vhci-hcd: Do not drop references before new references are gained", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-43883", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T15:32:14.861945Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-12T17:33:09.242Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:06:39.422Z" } } ] } }