Vulnerability-Lookup

CVE-2026-64366 (GCVE-0-2026-64366)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-07-25 08:50

Title

HID: wacom: fix slab-out-of-bounds write in wacom_wac_queue_insert

Summary

In the Linux kernel, the following vulnerability has been resolved: HID: wacom: fix slab-out-of-bounds write in wacom_wac_queue_insert wacom_wac_queue_insert() calls kfifo_skip() in a loop when the kfifo doesn't have enough space for the incoming report. If the kfifo is empty, kfifo_skip() reads stale data left in the kmalloc'd buffer via __kfifo_peek_n() and interprets it as a record length, advancing fifo->out by that garbage value. This corrupts the internal kfifo state, causing kfifo_unused() to return a value much larger than the actual buffer size, which bypasses __kfifo_in_r()'s guard: if (len + recsize > kfifo_unused(fifo)) return 0; kfifo_copy_in() then performs an out-of-bounds memcpy, writing up to 3842 bytes past the 256-byte buffer. Add a !kfifo_is_empty() condition to the while loop so kfifo_skip() is never called on an empty fifo, and check the return value of kfifo_in() to reject reports that are too large for the fifo.

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/ca899a926c11a5921…
https://git.kernel.org/stable/c/57bdd10ad50d68341…
https://git.kernel.org/stable/c/6b3014ec0e9a390ca…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 5e013ad206895e72d7da41bc1ae89d8cb499c3aa , < ca899a926c11a59211b764b0155d9a1cdcc32b81 (git) Affected: 5e013ad206895e72d7da41bc1ae89d8cb499c3aa , < 57bdd10ad50d68341f500a7b330f0d8949e510ec (git) Affected: 5e013ad206895e72d7da41bc1ae89d8cb499c3aa , < 6b3014ec0e9a390ca563030b2d7689921f0daef5 (git)
Linux	Linux	Affected: 6.15 Unaffected: 0 , < 6.15 (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

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    "datePublished": "2026-07-25T08:50:20.612Z",
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    "suse_vex": {
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      "id": "CVE-2026-64366",
      "initial_release_date": "2026-07-25T16:00:52Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64366",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64366.json",
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}

GHSA-4HX3-PX5F-MCX4

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

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

HID: wacom: fix slab-out-of-bounds write in wacom_wac_queue_insert

wacom_wac_queue_insert() calls kfifo_skip() in a loop when the kfifo doesn't have enough space for the incoming report. If the kfifo is empty, kfifo_skip() reads stale data left in the kmalloc'd buffer via __kfifo_peek_n() and interprets it as a record length, advancing fifo->out by that garbage value. This corrupts the internal kfifo state, causing kfifo_unused() to return a value much larger than the actual buffer size, which bypasses __kfifo_in_r()'s guard:

if (len + recsize > kfifo_unused(fifo)) return 0;

kfifo_copy_in() then performs an out-of-bounds memcpy, writing up to 3842 bytes past the 256-byte buffer.

Add a !kfifo_is_empty() condition to the while loop so kfifo_skip() is never called on an empty fifo, and check the return value of kfifo_in() to reject reports that are too large for the fifo.

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64366"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:19Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: wacom: fix slab-out-of-bounds write in wacom_wac_queue_insert\n\nwacom_wac_queue_insert() calls kfifo_skip() in a loop when the kfifo\ndoesn\u0027t have enough space for the incoming report. If the kfifo is\nempty, kfifo_skip() reads stale data left in the kmalloc\u0027d buffer\nvia __kfifo_peek_n() and interprets it as a record length, advancing\nfifo-\u003eout by that garbage value. This corrupts the internal kfifo\nstate, causing kfifo_unused() to return a value much larger than the\nactual buffer size, which bypasses __kfifo_in_r()\u0027s guard:\n\n  if (len + recsize \u003e kfifo_unused(fifo))\n      return 0;\n\nkfifo_copy_in() then performs an out-of-bounds memcpy, writing up to\n3842 bytes past the 256-byte buffer.\n\nAdd a !kfifo_is_empty() condition to the while loop so kfifo_skip()\nis never called on an empty fifo, and check the return value of\nkfifo_in() to reject reports that are too large for the fifo.",
  "id": "GHSA-4hx3-px5f-mcx4",
  "modified": "2026-07-25T12:31:33Z",
  "published": "2026-07-25T12:31:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64366"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/57bdd10ad50d68341f500a7b330f0d8949e510ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b3014ec0e9a390ca563030b2d7689921f0daef5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ca899a926c11a59211b764b0155d9a1cdcc32b81"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-64366 (GCVE-0-2026-64366)

GHSA-4HX3-PX5F-MCX4

Tags

Sightings

Nomenclature