Vulnerability-Lookup

GHSA-9CGM-8FJ5-JH9J

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-23 15:32

Details

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

drm/i915/hdcp: check streams[] bounds before overflow

The data->streams[] overflow check is done after the buffer overflow has already happened. Move the overflow check before the write.

Side note, emitting a warning splat with a backtrace might be overkill here, but prefer not changing the behaviour other than not doing the overrun.

Discovered using AI-assisted static analysis confirmed by Intel Product Security.

(cherry picked from commit 9284ab3b6e776c315883ac2611283d263c9460fd)

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-68253"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T13:20:13Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/hdcp: check streams[] bounds before overflow\n\nThe data-\u003estreams[] overflow check is done after the buffer overflow has\nalready happened. Move the overflow check before the write.\n\nSide note, emitting a warning splat with a backtrace might be overkill\nhere, but prefer not changing the behaviour other than not doing the\noverrun.\n\nDiscovered using AI-assisted static analysis confirmed by Intel Product\nSecurity.\n\n(cherry picked from commit 9284ab3b6e776c315883ac2611283d263c9460fd)",
  "id": "GHSA-9cgm-8fj5-jh9j",
  "modified": "2026-08-23T15:32:57Z",
  "published": "2026-08-10T15:33:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68253"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2106fb490b2c6003e23ad6ff36ce823a2170e138"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/336cf6d80d41457442b659e7ba7a7badc0ffe79d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/389079bf04e6f0c6f10f5b879f6d7a9cf80f0567"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3d2ef8d389495e7889c6062d8bddc46d2a5fbdef"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/84351f12390349ba010920fc247e1a0b12e41eb3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/984085c5b53572e2e03fd5fc4817e86ef1effc6e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bbb15a6b042d02e5508a02b4847e02d2579ee7bc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-68253 (GCVE-0-2026-68253)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:01 – Updated: 2026-08-23 12:46

Title

drm/i915/hdcp: check streams[] bounds before overflow

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/i915/hdcp: check streams[] bounds before overflow The data->streams[] overflow check is done after the buffer overflow has already happened. Move the overflow check before the write. Side note, emitting a warning splat with a backtrace might be overkill here, but prefer not changing the behaviour other than not doing the overrun. Discovered using AI-assisted static analysis confirmed by Intel Product Security. (cherry picked from commit 9284ab3b6e776c315883ac2611283d263c9460fd)

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

7 references

URL	Tags
https://git.kernel.org/stable/c/336cf6d80d4145744…
https://git.kernel.org/stable/c/389079bf04e6f0c6f…
https://git.kernel.org/stable/c/84351f12390349ba0…
https://git.kernel.org/stable/c/2106fb490b2c6003e…
https://git.kernel.org/stable/c/3d2ef8d389495e788…
https://git.kernel.org/stable/c/984085c5b53572e2e…
https://git.kernel.org/stable/c/bbb15a6b042d02e55…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9 , < 336cf6d80d41457442b659e7ba7a7badc0ffe79d (git) Affected: e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9 , < 389079bf04e6f0c6f10f5b879f6d7a9cf80f0567 (git) Affected: e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9 , < 84351f12390349ba010920fc247e1a0b12e41eb3 (git) Affected: e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9 , < 2106fb490b2c6003e23ad6ff36ce823a2170e138 (git) Affected: e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9 , < 3d2ef8d389495e7889c6062d8bddc46d2a5fbdef (git) Affected: e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9 , < 984085c5b53572e2e03fd5fc4817e86ef1effc6e (git) Affected: e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9 , < bbb15a6b042d02e5508a02b4847e02d2579ee7bc (git)
Linux	Linux	Affected: 5.12 Unaffected: 0 , < 5.12 (semver) Unaffected: 5.15.217 , ≤ 5.15.* (semver) Unaffected: 6.1.184 , ≤ 6.1.* (semver) Unaffected: 6.6.151 , ≤ 6.6.* (semver) Unaffected: 6.12.103 , ≤ 6.12.* (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.6 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/i915/display/intel_hdcp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "336cf6d80d41457442b659e7ba7a7badc0ffe79d",
              "status": "affected",
              "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9",
              "versionType": "git"
            },
            {
              "lessThan": "389079bf04e6f0c6f10f5b879f6d7a9cf80f0567",
              "status": "affected",
              "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9",
              "versionType": "git"
            },
            {
              "lessThan": "84351f12390349ba010920fc247e1a0b12e41eb3",
              "status": "affected",
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              "versionType": "git"
            },
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              "status": "affected",
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              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
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            {
              "lessThan": "984085c5b53572e2e03fd5fc4817e86ef1effc6e",
              "status": "affected",
              "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9",
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          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.12"
            },
            {
              "lessThan": "5.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.217",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.184",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.42",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/hdcp: check streams[] bounds before overflow\n\nThe data-\u003estreams[] overflow check is done after the buffer overflow has\nalready happened. Move the overflow check before the write.\n\nSide note, emitting a warning splat with a backtrace might be overkill\nhere, but prefer not changing the behaviour other than not doing the\noverrun.\n\nDiscovered using AI-assisted static analysis confirmed by Intel Product\nSecurity.\n\n(cherry picked from commit 9284ab3b6e776c315883ac2611283d263c9460fd)"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The overflow is reached through a local DRM atomic modeset ioctl on /dev/dri/cardN that sets the \"Content Protection\" connector property, driving intel_hdcp_enable() -\u003e intel_hdcp_prepare_streams(); no network or remote path exists to the i915 display HDCP code.\nAC:L - Any DP MST topology with more connected MST connectors on one digital port than the device has pipes (a common dock/hub/daisy-chain setup, and easily arranged by anyone with access to the machine\u0027s display outputs) makes every HDCP enable request overflow the buffer deterministically, with no race or memory-layout condition to win.\nPR:L - The attacker only needs access to the DRM device node as DRM master, which an ordinary user in a local graphical session (video/render group, logind seat) has; no CAP_SYS_ADMIN or root is required to request HDCP content protection on an MST connector.\nUI:N - The attacker performs the atomic commit that requests content protection themselves; no action by another user is needed, and on a system already running a compositor with HDCP desired the overflow occurs automatically on the modeset.\nS:U - The corruption is confined to kernel heap memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The out-of-bounds write corrupts adjacent objects in a small kmalloc slab, and such heap corruption is a standard primitive for pivoting to arbitrary kernel memory disclosure by overwriting neighbouring pointers or length fields.\nI:H - This is a heap out-of-bounds write past a kzalloc\u0027d streams[] buffer sized to INTEL_NUM_PIPES, with attacker-influenced VCPI values and an attacker-controlled overflow length determined by the MST topology, giving corruption of adjacent slab objects that can be leveraged for control-flow hijack.\nA:H - Overwriting adjacent slab allocations reliably produces slab corruption, oops, or panic, and the path can be re-triggered on every HDCP enable/modeset, so the system can be crashed repeatedly."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:46:11.002Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/336cf6d80d41457442b659e7ba7a7badc0ffe79d"
        },
        {
          "url": "https://git.kernel.org/stable/c/389079bf04e6f0c6f10f5b879f6d7a9cf80f0567"
        },
        {
          "url": "https://git.kernel.org/stable/c/84351f12390349ba010920fc247e1a0b12e41eb3"
        },
        {
          "url": "https://git.kernel.org/stable/c/2106fb490b2c6003e23ad6ff36ce823a2170e138"
        },
        {
          "url": "https://git.kernel.org/stable/c/3d2ef8d389495e7889c6062d8bddc46d2a5fbdef"
        },
        {
          "url": "https://git.kernel.org/stable/c/984085c5b53572e2e03fd5fc4817e86ef1effc6e"
        },
        {
          "url": "https://git.kernel.org/stable/c/bbb15a6b042d02e5508a02b4847e02d2579ee7bc"
        }
      ],
      "title": "drm/i915/hdcp: check streams[] bounds before overflow",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68253",
    "datePublished": "2026-08-10T12:01:19.402Z",
    "dateReserved": "2026-07-30T09:28:09.377Z",
    "dateUpdated": "2026-08-23T12:46:11.002Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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