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

Vulnerability from cvelistv5 – Published: 2026-08-10 12:02 – Updated: 2026-08-23 12:46
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 , < 185de1d74e658e2edb723ba76fa61903f77d8a68 (git)
Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < d7b9b1e33b4ed8c48d4db6e6e21c257ebbbb2586 (git)
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: 5.10.266 , ≤ 5.10.* (semver)
Unaffected: 5.15.217 , ≤ 5.15.* (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)
guessed Create a notification for this product.
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        }
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        "id": "CVE-2026-68279",
        "lastModified": "2026-08-23T13:16:36.153",
        "metrics": {},
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      "current_release_date": "2026-08-31T11:20:48+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": "44",
      "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"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-09-18T00:32:48Z",
      "cve": "CVE-2026-68279",
      "id": "CVE-2026-68279",
      "initial_release_date": "2026-08-21T00:44:02Z",
      "product_status:first_fixed": "23",
      "product_status:known_affected": "482",
      "product_status:known_not_affected": "266",
      "product_status:recommended": "107",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68279",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68279.json",
      "version": "6"
    }
  }
}



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Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.