CVE-2026-68277 (GCVE-0-2026-68277)
Vulnerability from cvelistv5
Published
2026-08-10 12:01
Modified
2026-08-23 12:46
Severity ?
VLAI Severity ?
EPSS score ?
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]
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: ad7f8a1f9ced7f049f9b66d588723f243a7034cd Version: ad7f8a1f9ced7f049f9b66d588723f243a7034cd Version: ad7f8a1f9ced7f049f9b66d588723f243a7034cd Version: ad7f8a1f9ced7f049f9b66d588723f243a7034cd Version: ad7f8a1f9ced7f049f9b66d588723f243a7034cd Version: ad7f8a1f9ced7f049f9b66d588723f243a7034cd Version: ad7f8a1f9ced7f049f9b66d588723f243a7034cd Version: ad7f8a1f9ced7f049f9b66d588723f243a7034cd |
||
{
"containers": {
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"product": "Linux",
"programFiles": [
"drivers/gpu/drm/display/drm_dp_mst_topology.c"
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"vendor": "Linux",
"versions": [
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},
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"version": "0",
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},
{
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"status": "unaffected",
"version": "5.10.266",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.217",
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},
{
"lessThanOrEqual": "6.1.*",
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"version": "6.1.183",
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},
{
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"version": "6.6.148",
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},
{
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"version": "6.12.101",
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},
{
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"version": "6.18.42",
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},
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},
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"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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"
},
"references": [
{
"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"
},
{
"url": "https://git.kernel.org/stable/c/d5c70523cafa26ad2c7a37b612849abe2683baa8"
},
{
"url": "https://git.kernel.org/stable/c/68a624416d1dd481b3e5b7ea0e8a070a9b8a2c73"
},
{
"url": "https://git.kernel.org/stable/c/6b89ba3dba2f583626fb693e47e951ffb8bf591f"
}
],
"title": "drm/dp/mst: fix OOB reads on 2-byte fields in sideband reply parsers",
"x_generator": {
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}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"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"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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