CVE-2026-63849 (GCVE-0-2026-63849)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:04 – Updated: 2026-07-20 13:40
VLAI
Title
drm/amdgpu/vcn: set no_user_fence for VCN v5.0.1 enc ring
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/vcn: set no_user_fence for VCN v5.0.1 enc ring VCN encoder and decoder rings do not support 64-bit user fence writes, reject CS submissions with user fences. (cherry picked from commit e16be95a2c3ee712b142cb27d2dca0b461181359)
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 346492f30ce3581bf5324c4ae417eab8537dc998 , < 081ef0e46c9cdd26c0db0ef721470393d36b6655 (git)
Affected: 346492f30ce3581bf5324c4ae417eab8537dc998 , < 5a4bffd67e94944ed3db26a959346cfb7fabaecd (git)
Affected: 346492f30ce3581bf5324c4ae417eab8537dc998 , < 8f4954722eab88e10c4ea0c0d3b1269c31421d3a (git)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/vcn_v5_0_1.c"
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              "operator": "OR"
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      "descriptions": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/vcn: set no_user_fence for VCN v5.0.1 enc ring\n\nVCN encoder and decoder rings do not support 64-bit user fence writes,\nreject CS submissions with user fences.\n\n(cherry picked from commit e16be95a2c3ee712b142cb27d2dca0b461181359)"
        }
      ],
      "metrics": [
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          "cvssV3_1": {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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      "providerMetadata": {
        "dateUpdated": "2026-07-20T13:40:46.622Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/8f4954722eab88e10c4ea0c0d3b1269c31421d3a"
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      "title": "drm/amdgpu/vcn: set no_user_fence for VCN v5.0.1 enc ring",
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    "cveId": "CVE-2026-63849",
    "datePublished": "2026-07-19T14:04:41.395Z",
    "dateReserved": "2026-07-19T07:54:57.016Z",
    "dateUpdated": "2026-07-20T13:40:46.622Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-21T08:04:43+00:00",
      "cve": "CVE-2026-63849",
      "id": "CVE-2026-63849",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/amdgpu/vcn: set no_user_fence for VCN v5.0.1 enc ring",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63849.json",
      "version": "3"
    }
  }
}



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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

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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.