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CVE-2024-43883 (GCVE-0-2024-43883)

Vulnerability from cvelistv5 – Published: 2024-08-23 13:08 – Updated: 2026-08-05 11:36
VLAI
Title
usb: vhci-hcd: Do not drop references before new references are gained
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:32 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7606ee8aa33287dd3e6eb44c78541b87a413a325 , < 5a3c473b28ae1c1f7c4dc129e30cb19ae6e96f89 (git)
Affected: 7606ee8aa33287dd3e6eb44c78541b87a413a325 , < 9c3746ce8d8fcb3a2405644fc0eec7fc5312de80 (git)
Affected: 7606ee8aa33287dd3e6eb44c78541b87a413a325 , < 4dacdb9720aaab10b6be121eae55820174d97174 (git)
Affected: 7606ee8aa33287dd3e6eb44c78541b87a413a325 , < e8c1e606dab8c56cf074b43b98d0805de7322ba2 (git)
Affected: 7606ee8aa33287dd3e6eb44c78541b87a413a325 , < 585e6bc7d0a9bf73a8be3d3fb34e86b90cc61a14 (git)
Affected: 7606ee8aa33287dd3e6eb44c78541b87a413a325 , < 128e82e41cf7d74a562726c1587d9d2ede1a0a37 (git)
Affected: 7606ee8aa33287dd3e6eb44c78541b87a413a325 , < c3d0857b7fc2c49f68f89128a5440176089a8f54 (git)
Affected: 7606ee8aa33287dd3e6eb44c78541b87a413a325 , < afdcfd3d6fcdeca2735ca8d994c5f2d24a368f0a (git)
Affected: 96ea4801d2035f89fc4ec4a67f49a18c35cb6715 (git)
Affected: 075b4e6a982d38121250c090f7b9294314ac1b19 (git)
Affected: 436e52f1a628233f080605dd736594df250897ca (git)
Affected: 1c8d316294916da7e2a2f1f178ca3f3bd6d7b531 (git)
Affected: 927c3fa44e24300eb827ab9f9dacce6dff9c9bb7 (git)
Affected: 2.6.32.30 , < 2.6.33 (semver)
Affected: 2.6.33.8 , < 2.6.34 (semver)
Affected: 2.6.34.10 , < 2.6.35 (semver)
Affected: 2.6.35.12 , < 2.6.36 (semver)
Affected: 2.6.37.3 , < 2.6.38 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.38
Unaffected: 0 , < 2.6.38 (semver)
Unaffected: 4.19.320 , ≤ 4.19.* (semver)
Unaffected: 5.4.282 , ≤ 5.4.* (semver)
Unaffected: 5.10.224 , ≤ 5.10.* (semver)
Unaffected: 5.15.165 , ≤ 5.15.* (semver)
Unaffected: 6.1.105 , ≤ 6.1.* (semver)
Unaffected: 6.6.46 , ≤ 6.6.* (semver)
Unaffected: 6.10.5 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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    "datePublished": "2024-08-23T13:08:10.508Z",
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      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-43883\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-08-23T13:15:03.873\",\"lastModified\":\"2026-08-04T11:19:58.197\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usb: vhci-hcd: no descartar referencias antes de obtener nuevas referencias. En algunos lugares, el controlador incluye punteros obsoletos a referencias que a\u00fan se pueden utilizar. Aseg\u00farate de que eso no suceda. Esto cierra estrictamente ZDI-CAN-22273, aunque puede haber ejecuciones similares en el 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T18:08:36+00:00",
      "cve": "CVE-2024-43883",
      "id": "CVE-2024-43883",
      "initial_release_date": "2024-08-23T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: usb: vhci-hcd: Do not drop references before new references are gained",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-43883.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-29T01:50:09Z",
      "cve": "CVE-2024-43883",
      "id": "CVE-2024-43883",
      "initial_release_date": "2024-08-25T02:31:30Z",
      "product_status:known_affected": "405",
      "product_status:known_not_affected": "6",
      "product_status:recommended": "1007",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-43883",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-43883.json",
      "version": "74"
    },
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      "containers": "{\"adp\": [{\"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\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"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\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:15.504Z\"}}], \"cna\": {\"title\": \"usb: vhci-hcd: Do not drop references before new references are gained\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 9.8, \"baseSeverity\": \"CRITICAL\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\"}, \"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` \\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. 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{\"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\", 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{\"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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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.