CVE-2026-68256 (GCVE-0-2026-68256)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:01 – Updated: 2026-08-17 05:01
VLAI
Title
drm/amd/display: detect_link_and_local_sink: DP alt mode timeout path leaks prev_sink reference
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: detect_link_and_local_sink: DP alt mode timeout path leaks prev_sink reference prev_sink is unconditionally retained via dc_sink_retain at function entry, but the DP alt mode timeout path inside SIGNAL_TYPE_DISPLAY_PORT returns false without releasing prev_sink. All other return paths in the function correctly call dc_sink_release(prev_sink), making this the only missing cleanup. (cherry picked from commit 45510cf662dcf46b5d8926d454f338809f107b9d)
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 54618888d1ea7a26f8bccfb89e3c2420350c8047 , < f9922828a4ebd26286fbe0286cc61695e7d9b07b (git)
Affected: 54618888d1ea7a26f8bccfb89e3c2420350c8047 , < a59e493567d18ef3858be9368acd132a01ebfa09 (git)
Affected: 54618888d1ea7a26f8bccfb89e3c2420350c8047 , < 4ee77643e6194f2deb62fe62f04396f9825e27d8 (git)
Affected: 54618888d1ea7a26f8bccfb89e3c2420350c8047 , < 58ea24dd96848626039296e9e8510270ec8dc4bf (git)
Affected: 54618888d1ea7a26f8bccfb89e3c2420350c8047 , < a6e14b976be48eebd8769cb5b883a6af7fc5ade1 (git)
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Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 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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{
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          "programFiles": [
            "drivers/gpu/drm/amd/display/dc/link/link_detection.c"
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      "cpeApplicability": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: detect_link_and_local_sink: DP alt mode timeout path leaks prev_sink reference\n\nprev_sink is unconditionally retained via dc_sink_retain at function\n  entry, but the DP alt mode timeout path inside SIGNAL_TYPE_DISPLAY_PORT\n  returns false without releasing prev_sink. All other return paths in the\n  function correctly call dc_sink_release(prev_sink), making this the only\n  missing cleanup.\n\n(cherry picked from commit 45510cf662dcf46b5d8926d454f338809f107b9d)"
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      "providerMetadata": {
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/a6e14b976be48eebd8769cb5b883a6af7fc5ade1"
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      ],
      "title": "drm/amd/display: detect_link_and_local_sink: DP alt mode timeout path leaks prev_sink reference",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68256",
    "datePublished": "2026-08-10T12:01:26.406Z",
    "dateReserved": "2026-07-30T09:28:09.378Z",
    "dateUpdated": "2026-08-17T05:01:47.968Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-13T23:21:49+00:00",
      "cve": "CVE-2026-68256",
      "id": "CVE-2026-68256",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "232",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/amd/display: detect_link_and_local_sink: DP alt mode timeout path leaks prev_sink reference",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68256.json",
      "version": "3"
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    "suse_vex": {
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      "current_release_date": "2026-08-14T23:45:32Z",
      "cve": "CVE-2026-68256",
      "id": "CVE-2026-68256",
      "initial_release_date": "2026-08-14T17:15:11Z",
      "product_status:known_affected": "30",
      "product_status:known_not_affected": "266",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68256",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68256.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

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.