CVE-2026-68279 (GCVE-0-2026-68279)
Vulnerability from cvelistv5 – Published: 2026-08-10 12:02 – Updated: 2026-08-23 12:46
VLAI
EPSS
VEX
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
8 references
Impacted products
2 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) |
guessed | |
| 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 |
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},
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"descriptions": [
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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]"
}
],
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"dateReserved": "2026-07-30T09:28:09.379Z",
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"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]"
}
],
"id": "CVE-2026-68279",
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"metrics": {},
"published": "2026-08-10T13:20:17.047",
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},
"redhat_vex": {
"aggregate_severity": "Moderate",
"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": "2026-09-23T00:20:39Z",
"cve": "CVE-2026-68279",
"id": "CVE-2026-68279",
"initial_release_date": "2026-08-21T00:44:02Z",
"product_status:first_fixed": "68",
"product_status:known_affected": "482",
"product_status:known_not_affected": "212",
"product_status:recommended": "130",
"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": "8"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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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.
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.
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