CVE-2026-68277 (GCVE-0-2026-68277)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:01 – Updated: 2026-08-19 16:32
VLAI
Title
drm/dp/mst: fix OOB reads on 2-byte fields in sideband reply parsers
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/dp/mst: fix OOB reads on 2-byte fields in sideband reply parsers Three sideband reply parsers read 16-bit fields as: val = (raw->msg[idx] << 8) | (raw->msg[idx+1]); and check bounds only after the fact. When idx == raw->curlen, raw->msg[idx+1] reads one byte past the received message data into the following struct fields (curchunk_len, curchunk_idx, curlen). Affected functions: - drm_dp_sideband_parse_enum_path_resources_ack() full_payload_bw_number and avail_payload_bw_number fields - drm_dp_sideband_parse_allocate_payload_ack() allocated_pbn field - drm_dp_sideband_parse_query_payload_ack() allocated_pbn field Fix by using a single combined check (idx + 2 > curlen) before each 2-byte read. Since the check is strictly tighter than idx > curlen, no separate step is needed. [added fixes tag]
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < 6e3107e6522109a07fc9bb0fc4ec463f1982e113 (git)
Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < bdf0508b1e6785d4a8982c637e97e68d60b47d7b (git)
Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < 0bcd7675c69a2462a8531fcd9e4d096e9c7ec5df (git)
Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < d5c70523cafa26ad2c7a37b612849abe2683baa8 (git)
Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < 68a624416d1dd481b3e5b7ea0e8a070a9b8a2c73 (git)
Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < 6b89ba3dba2f583626fb693e47e951ffb8bf591f (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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          "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 on 2-byte fields in sideband reply parsers\n\nThree sideband reply parsers read 16-bit fields as:\n\n  val = (raw-\u003emsg[idx] \u003c\u003c 8) | (raw-\u003emsg[idx+1]);\n\nand check bounds only after the fact. When idx == raw-\u003ecurlen,\nraw-\u003emsg[idx+1] reads one byte past the received message data into\nthe following struct fields (curchunk_len, curchunk_idx, curlen).\n\nAffected functions:\n - drm_dp_sideband_parse_enum_path_resources_ack()\n   full_payload_bw_number and avail_payload_bw_number fields\n - drm_dp_sideband_parse_allocate_payload_ack()\n   allocated_pbn field\n - drm_dp_sideband_parse_query_payload_ack()\n   allocated_pbn field\n\nFix by using a single combined check (idx + 2 \u003e curlen) before each\n2-byte read. Since the check is strictly tighter than idx \u003e curlen,\nno separate step is needed.\n\n[added fixes tag]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:32:33.194Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/6e3107e6522109a07fc9bb0fc4ec463f1982e113"
        },
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          "url": "https://git.kernel.org/stable/c/bdf0508b1e6785d4a8982c637e97e68d60b47d7b"
        },
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          "url": "https://git.kernel.org/stable/c/0bcd7675c69a2462a8531fcd9e4d096e9c7ec5df"
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        },
        {
          "url": "https://git.kernel.org/stable/c/6b89ba3dba2f583626fb693e47e951ffb8bf591f"
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    "cveId": "CVE-2026-68277",
    "datePublished": "2026-08-10T12:01:53.085Z",
    "dateReserved": "2026-07-30T09:28:09.379Z",
    "dateUpdated": "2026-08-19T16:32:33.194Z",
    "state": "PUBLISHED"
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    "epss": {
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-11T22:01:42+00:00",
      "cve": "CVE-2026-68277",
      "id": "CVE-2026-68277",
      "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 on 2-byte fields in sideband reply parsers",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68277.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-14T23:45:07Z",
      "cve": "CVE-2026-68277",
      "id": "CVE-2026-68277",
      "initial_release_date": "2026-08-14T17:14:39Z",
      "product_status:known_affected": "193",
      "product_status:known_not_affected": "103",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68277",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68277.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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.