CVE-2026-68279 (GCVE-0-2026-68279)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:02 – Updated: 2026-08-19 16:32
VLAI
Title
drm/dp/mst: fix OOB reads in remote DPCD/I2C sideband reply parsers
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/dp/mst: fix OOB reads in remote DPCD/I2C sideband reply parsers drm_dp_sideband_parse_remote_dpcd_read() reads num_bytes from the raw message and then unconditionally does: memcpy(bytes, &raw->msg[idx], num_bytes); without checking that idx + num_bytes <= raw->curlen. raw->msg[] is 256 bytes; if a malicious or misbehaving MST hub sets num_bytes larger than the remaining payload, the memcpy reads past the received data into whatever follows in raw->msg[]. drm_dp_sideband_parse_remote_i2c_read_ack() has the same flaw (noted with a /* TODO check */ comment since the code was introduced). Fix both functions by using a single combined check (idx + num_bytes > curlen) before each memcpy. Since num_bytes is u8, it is always >= 0, so this strictly subsumes the simpler idx > curlen form and no separate step is needed. [added missing fixes tag]
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < c2fbda0fe0163c55ba3820ee6cea0c6b43622eda (git)
Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < 22d9f7fc1aaabaf73d5f30e8b0c9aa814ecd6ed2 (git)
Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < 04d953f50d61e542e94a5977822cc53735f8c0ce (git)
Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < 533d9e2bede4aeefdc2a0561d7071cfede95958f (git)
Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < e6ef5455b06cb4e5d181aabcd723791587c79f12 (git)
Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < 1a8f537f5a1eeac941f262fe73078d6b08ba83c0 (git)
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Linux Linux Affected: 3.17
Unaffected: 0 , < 3.17 (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (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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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/display/drm_dp_mst_topology.c"
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      "cpeApplicability": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/dp/mst: fix OOB reads in remote DPCD/I2C sideband reply parsers\n\ndrm_dp_sideband_parse_remote_dpcd_read() reads num_bytes from the raw\nmessage and then unconditionally does:\n\n  memcpy(bytes, \u0026raw-\u003emsg[idx], num_bytes);\n\nwithout checking that idx + num_bytes \u003c= raw-\u003ecurlen. raw-\u003emsg[] is\n256 bytes; if a malicious or misbehaving MST hub sets num_bytes larger\nthan the remaining payload, the memcpy reads past the received data\ninto whatever follows in raw-\u003emsg[].\n\ndrm_dp_sideband_parse_remote_i2c_read_ack() has the same flaw (noted\nwith a /* TODO check */ comment since the code was introduced).\n\nFix both functions by using a single combined check\n(idx + num_bytes \u003e curlen) before each memcpy. Since num_bytes is u8,\nit is always \u003e= 0, so this strictly subsumes the simpler idx \u003e curlen\nform and no separate step is needed.\n\n[added missing fixes tag]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:32:38.714Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/c2fbda0fe0163c55ba3820ee6cea0c6b43622eda"
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          "url": "https://git.kernel.org/stable/c/22d9f7fc1aaabaf73d5f30e8b0c9aa814ecd6ed2"
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          "url": "https://git.kernel.org/stable/c/04d953f50d61e542e94a5977822cc53735f8c0ce"
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          "url": "https://git.kernel.org/stable/c/1a8f537f5a1eeac941f262fe73078d6b08ba83c0"
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    "datePublished": "2026-08-10T12:02:09.423Z",
    "dateReserved": "2026-07-30T09:28:09.379Z",
    "dateUpdated": "2026-08-19T16:32:38.714Z",
    "state": "PUBLISHED"
  },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-12T22:18:05+00:00",
      "cve": "CVE-2026-68279",
      "id": "CVE-2026-68279",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "233",
      "product_status:known_not_affected": "43",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/dp/mst: fix OOB reads in remote DPCD/I2C sideband reply parsers",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68279.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.