CVE-2026-68277 (GCVE-0-2026-68277)
Vulnerability from cvelistv5 – Published: 2026-08-10 12:01 – Updated: 2026-08-23 12:46
VLAI
EPSS
VEX
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
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < c1f72a13d54ffd16647d3fa540d961f5deba8790
(git)
Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < 192e146c2d57ad033b0d418ec64ee390f8dc074e (git) Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < 6e3107e6522109a07fc9bb0fc4ec463f1982e113 (git) Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < bdf0508b1e6785d4a8982c637e97e68d60b47d7b (git) Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < 0bcd7675c69a2462a8531fcd9e4d096e9c7ec5df (git) Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < d5c70523cafa26ad2c7a37b612849abe2683baa8 (git) Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < 68a624416d1dd481b3e5b7ea0e8a070a9b8a2c73 (git) Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < 6b89ba3dba2f583626fb693e47e951ffb8bf591f (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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{
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"version": "7.1.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
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},
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{
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},
{
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],
"negate": false,
"operator": "OR"
}
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],
"descriptions": [
{
"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": "2026-08-23T12:46:14.372Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
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"url": "https://git.kernel.org/stable/c/c1f72a13d54ffd16647d3fa540d961f5deba8790"
},
{
"url": "https://git.kernel.org/stable/c/192e146c2d57ad033b0d418ec64ee390f8dc074e"
},
{
"url": "https://git.kernel.org/stable/c/6e3107e6522109a07fc9bb0fc4ec463f1982e113"
},
{
"url": "https://git.kernel.org/stable/c/bdf0508b1e6785d4a8982c637e97e68d60b47d7b"
},
{
"url": "https://git.kernel.org/stable/c/0bcd7675c69a2462a8531fcd9e4d096e9c7ec5df"
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"url": "https://git.kernel.org/stable/c/d5c70523cafa26ad2c7a37b612849abe2683baa8"
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},
{
"url": "https://git.kernel.org/stable/c/6b89ba3dba2f583626fb693e47e951ffb8bf591f"
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],
"title": "drm/dp/mst: fix OOB reads on 2-byte fields in sideband reply parsers",
"x_generator": {
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"cveId": "CVE-2026-68277",
"datePublished": "2026-08-10T12:01:53.085Z",
"dateReserved": "2026-07-30T09:28:09.379Z",
"dateUpdated": "2026-08-23T12:46:14.372Z",
"state": "PUBLISHED"
},
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"date": "2026-09-30",
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"percentile": "0.11312"
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"cveTags": [],
"descriptions": [
{
"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]"
}
],
"id": "CVE-2026-68277",
"lastModified": "2026-08-23T13:16:35.883",
"metrics": {},
"published": "2026-08-10T13:20:16.803",
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},
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-31T11:20:44+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": "44",
"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": "2026-09-23T00:20:42Z",
"cve": "CVE-2026-68277",
"id": "CVE-2026-68277",
"initial_release_date": "2026-08-14T17:14:39Z",
"product_status:first_fixed": "68",
"product_status:known_affected": "617",
"product_status:known_not_affected": "60",
"product_status:recommended": "130",
"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": "12"
}
}
}
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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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