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GHSA-36GR-GW56-G35V

Vulnerability from github – Published: 2026-06-25 09:31 – Updated: 2026-06-25 09:31

Details

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

drm/amd/display: Clamp HDMI HDCP2 rx_id_list read to buffer size

[Why & How] During HDCP 2.x repeater authentication over HDMI, the driver reads the sink's RxStatus register and extracts a 10-bit message size field (max value 1023). This value is used as the read length for the ReceiverID list without being clamped to the size of the destination buffer rx_id_list[177]. A malicious HDMI repeater could advertise a message size larger than the buffer, causing an out-of-bounds write during the I2C read.

Clamp the read length in mod_hdcp_read_rx_id_list() to the size of the rx_id_list buffer, matching the approach already used in the DP branch.

(cherry picked from commit 229212219e4247d9486f8ba41ef087358490be09)

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53137"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-25T09:16:31Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Clamp HDMI HDCP2 rx_id_list read to buffer size\n\n[Why \u0026 How]\nDuring HDCP 2.x repeater authentication over HDMI, the driver reads the\nsink\u0027s RxStatus register and extracts a 10-bit message size field (max\nvalue 1023). This value is used as the read length for the ReceiverID\nlist without being clamped to the size of the destination buffer\nrx_id_list[177]. A malicious HDMI repeater could advertise a message\nsize larger than the buffer, causing an out-of-bounds write during the\nI2C read.\n\nClamp the read length in mod_hdcp_read_rx_id_list() to the size of the\nrx_id_list buffer, matching the approach already used in the DP branch.\n\n(cherry picked from commit 229212219e4247d9486f8ba41ef087358490be09)",
  "id": "GHSA-36gr-gw56-g35v",
  "modified": "2026-06-25T09:31:18Z",
  "published": "2026-06-25T09:31:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53137"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1906064d50d194a145486e5caf3db3e708b6f6ef"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c4444aec06c74fbc05661f370954ac814963c38"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/79e0273272a05fb26f9b1e55bf1a52eefc3b7b35"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/91fb41218c413989d8b6c837748751454b452d68"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/964e50ef7b8f09815a7d05b8326af700f8d5bc96"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98cfb7530ea91d8e5e928285cdce58e1131f6e83"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bfba882cfcd08f6540f72f48e786b6404f5d2c5b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f0f3981c43b32cadfe373d636d9e9ca522bb3702"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-53137 (GCVE-0-2026-53137)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:38 – Updated: 2026-06-25 08:38

Title

drm/amd/display: Clamp HDMI HDCP2 rx_id_list read to buffer size

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Clamp HDMI HDCP2 rx_id_list read to buffer size [Why & How] During HDCP 2.x repeater authentication over HDMI, the driver reads the sink's RxStatus register and extracts a 10-bit message size field (max value 1023). This value is used as the read length for the ReceiverID list without being clamped to the size of the destination buffer rx_id_list[177]. A malicious HDMI repeater could advertise a message size larger than the buffer, causing an out-of-bounds write during the I2C read. Clamp the read length in mod_hdcp_read_rx_id_list() to the size of the rx_id_list buffer, matching the approach already used in the DP branch. (cherry picked from commit 229212219e4247d9486f8ba41ef087358490be09)

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/3c4444aec06c74fbc…
https://git.kernel.org/stable/c/91fb41218c413989d…
https://git.kernel.org/stable/c/964e50ef7b8f09815…
https://git.kernel.org/stable/c/79e0273272a05fb26…
https://git.kernel.org/stable/c/bfba882cfcd08f654…
https://git.kernel.org/stable/c/1906064d50d194a14…
https://git.kernel.org/stable/c/98cfb7530ea91d8e5…
https://git.kernel.org/stable/c/f0f3981c43b32cadf…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: eff682f83c9c2030761e7536c5d97e1b20f71c15 , < 3c4444aec06c74fbc05661f370954ac814963c38 (git) Affected: eff682f83c9c2030761e7536c5d97e1b20f71c15 , < 91fb41218c413989d8b6c837748751454b452d68 (git) Affected: eff682f83c9c2030761e7536c5d97e1b20f71c15 , < 964e50ef7b8f09815a7d05b8326af700f8d5bc96 (git) Affected: eff682f83c9c2030761e7536c5d97e1b20f71c15 , < 79e0273272a05fb26f9b1e55bf1a52eefc3b7b35 (git) Affected: eff682f83c9c2030761e7536c5d97e1b20f71c15 , < bfba882cfcd08f6540f72f48e786b6404f5d2c5b (git) Affected: eff682f83c9c2030761e7536c5d97e1b20f71c15 , < 1906064d50d194a145486e5caf3db3e708b6f6ef (git) Affected: eff682f83c9c2030761e7536c5d97e1b20f71c15 , < 98cfb7530ea91d8e5e928285cdce58e1131f6e83 (git) Affected: eff682f83c9c2030761e7536c5d97e1b20f71c15 , < f0f3981c43b32cadfe373d636d9e9ca522bb3702 (git)
Linux	Linux	Affected: 5.6 Unaffected: 0 , < 5.6 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.94 , ≤ 6.12.* (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.6"
            },
            {
              "lessThan": "5.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
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            }
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        {
          "url": "https://git.kernel.org/stable/c/f0f3981c43b32cadfe373d636d9e9ca522bb3702"
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      ],
      "title": "drm/amd/display: Clamp HDMI HDCP2 rx_id_list read to buffer size",
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}

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.

Action not permitted

GHSA-36GR-GW56-G35V

CVE-2026-53137 (GCVE-0-2026-53137)

Tags

Sightings

Nomenclature