GHSA-FG46-5P85-H39F

Vulnerability from github – Published: 2025-08-19 18:31 – Updated: 2025-08-28 15:30
VLAI?
Details

In the Linux kernel, the following vulnerability has been resolved:

vmci: Prevent the dispatching of uninitialized payloads

The reproducer executes the host's unlocked_ioctl call in two different tasks. When init_context fails, the struct vmci_event_ctx is not fully initialized when executing vmci_datagram_dispatch() to send events to all vm contexts. This affects the datagram taken from the datagram queue of its context by another task, because the datagram payload is not initialized according to the size payload_size, which causes the kernel data to leak to the user space.

Before dispatching the datagram, and before setting the payload content, explicitly set the payload content to 0 to avoid data leakage caused by incomplete payload initialization.

Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2025-38611"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-08-19T17:15:39Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvmci: Prevent the dispatching of uninitialized payloads\n\nThe reproducer executes the host\u0027s unlocked_ioctl call in two different\ntasks. When init_context fails, the struct vmci_event_ctx is not fully\ninitialized when executing vmci_datagram_dispatch() to send events to all\nvm contexts. This affects the datagram taken from the datagram queue of\nits context by another task, because the datagram payload is not initialized\naccording to the size payload_size, which causes the kernel data to leak\nto the user space.\n\nBefore dispatching the datagram, and before setting the payload content,\nexplicitly set the payload content to 0 to avoid data leakage caused by\nincomplete payload initialization.",
  "id": "GHSA-fg46-5p85-h39f",
  "modified": "2025-08-28T15:30:39Z",
  "published": "2025-08-19T18:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38611"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2c86366ce37f398e20fa09e7e9dc8788fbf6cf0c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6696a46f4ebdc7314ff23a2fb0e93a95da2c45ee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7624fe66a0832eb6fe4e465fcdd4f9104fb9b339"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/87f8f8654e55cf9327cc63746595085a041699dc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/94112b0d443e0b6b5bb17854f97c1498064cc9ed"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a85dc83857497fa1f68a9b23e7213949d4cb51ea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b097d921efb5bb150066365287ff046b8c8b29f5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bfb4cf9fb97e4063f0aa62e9e398025fb6625031"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bfd6b211fe8aae79acbedd19e8d5bea5d062a41b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.