CVE-2026-68278 (GCVE-0-2026-68278)
Vulnerability from cvelistv5 – Published: 2026-08-10 12:01 – Updated: 2026-08-23 12:46
VLAI
EPSS
VEX
Title
drm/dp/mst: fix buffer overflows in sideband chunk accumulation
Summary
In the Linux kernel, the following vulnerability has been resolved:
drm/dp/mst: fix buffer overflows in sideband chunk accumulation
drm_dp_sideband_append_payload() has three related bugs when processing
device-provided sideband reply data:
1. Zero-length curchunk_len underflow: msg_len is a 6-bit field taken
directly from the DP sideband header. If a device sends msg_len=0,
curchunk_len is set to zero. The condition (curchunk_idx >= curchunk_len)
is immediately true, and curchunk_len-1 wraps to 255 (u8 underflow).
drm_dp_msg_data_crc4() reads 255 bytes from chunk[48], then memcpy()
writes 255 bytes into msg[], both far out of bounds.
2. chunk[48] overflow: curchunk_len can reach 63 (6-bit field). chunk[] is
only 48 bytes. Multi-iteration payload assembly appends 16-byte blocks
until curchunk_idx reaches curchunk_len, writing up to 15 bytes past
the end of chunk[] into msg[].
3. msg[256] overflow: each chunk contributes (curchunk_len-1) bytes to
msg[]. No check ensures curlen + (curchunk_len-1) stays within msg[256],
so the memcpy can spill into adjacent struct fields.
All three are reachable from any DP MST device that can forge sideband
reply messages on a physical connection.
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < ef2ecb6cf268debf3890df99fea01b6452dcf78e
(git)
Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < d4e05dedb252ed3e540a0c9be511e427f098110a (git) Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < 4d5109075a787de28c9e89940f9dee45269f91fa (git) Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < 53937a2787d29c7a460e984dc4f20ff6ac91dc65 (git) Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < ef0dbcc200c3389f1f781ab181932a97e54b51af (git) Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < 1e5827839ad0ceb0079d1560c321fa3656b54f21 (git) Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < a6366b551079c79bf7bdbadd74c97358bcfe2d58 (git) Affected: ad7f8a1f9ced7f049f9b66d588723f243a7034cd , < 55bd5e685bda455b9b50c835f8c8442d52a344a3 (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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"version": "6.1.183",
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},
{
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{
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"versionType": "semver"
},
{
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"status": "unaffected",
"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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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/dp/mst: fix buffer overflows in sideband chunk accumulation\n\ndrm_dp_sideband_append_payload() has three related bugs when processing\ndevice-provided sideband reply data:\n\n1. Zero-length curchunk_len underflow: msg_len is a 6-bit field taken\n directly from the DP sideband header. If a device sends msg_len=0,\n curchunk_len is set to zero. The condition (curchunk_idx \u003e= curchunk_len)\n is immediately true, and curchunk_len-1 wraps to 255 (u8 underflow).\n drm_dp_msg_data_crc4() reads 255 bytes from chunk[48], then memcpy()\n writes 255 bytes into msg[], both far out of bounds.\n\n2. chunk[48] overflow: curchunk_len can reach 63 (6-bit field). chunk[] is\n only 48 bytes. Multi-iteration payload assembly appends 16-byte blocks\n until curchunk_idx reaches curchunk_len, writing up to 15 bytes past\n the end of chunk[] into msg[].\n\n3. msg[256] overflow: each chunk contributes (curchunk_len-1) bytes to\n msg[]. No check ensures curlen + (curchunk_len-1) stays within msg[256],\n so the memcpy can spill into adjacent struct fields.\n\nAll three are reachable from any DP MST device that can forge sideband\nreply messages on a physical connection."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-23T12:46:15.450Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"references": [
{
"url": "https://git.kernel.org/stable/c/ef2ecb6cf268debf3890df99fea01b6452dcf78e"
},
{
"url": "https://git.kernel.org/stable/c/d4e05dedb252ed3e540a0c9be511e427f098110a"
},
{
"url": "https://git.kernel.org/stable/c/4d5109075a787de28c9e89940f9dee45269f91fa"
},
{
"url": "https://git.kernel.org/stable/c/53937a2787d29c7a460e984dc4f20ff6ac91dc65"
},
{
"url": "https://git.kernel.org/stable/c/ef0dbcc200c3389f1f781ab181932a97e54b51af"
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{
"url": "https://git.kernel.org/stable/c/1e5827839ad0ceb0079d1560c321fa3656b54f21"
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"url": "https://git.kernel.org/stable/c/a6366b551079c79bf7bdbadd74c97358bcfe2d58"
},
{
"url": "https://git.kernel.org/stable/c/55bd5e685bda455b9b50c835f8c8442d52a344a3"
}
],
"title": "drm/dp/mst: fix buffer overflows in sideband chunk accumulation",
"x_generator": {
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}
}
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"cveId": "CVE-2026-68278",
"datePublished": "2026-08-10T12:01:54.285Z",
"dateReserved": "2026-07-30T09:28:09.379Z",
"dateUpdated": "2026-08-23T12:46:15.450Z",
"state": "PUBLISHED"
},
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"date": "2026-10-01",
"epss": "0.00238",
"percentile": "0.13403"
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}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/dp/mst: fix buffer overflows in sideband chunk accumulation\n\ndrm_dp_sideband_append_payload() has three related bugs when processing\ndevice-provided sideband reply data:\n\n1. Zero-length curchunk_len underflow: msg_len is a 6-bit field taken\n directly from the DP sideband header. If a device sends msg_len=0,\n curchunk_len is set to zero. The condition (curchunk_idx \u003e= curchunk_len)\n is immediately true, and curchunk_len-1 wraps to 255 (u8 underflow).\n drm_dp_msg_data_crc4() reads 255 bytes from chunk[48], then memcpy()\n writes 255 bytes into msg[], both far out of bounds.\n\n2. chunk[48] overflow: curchunk_len can reach 63 (6-bit field). chunk[] is\n only 48 bytes. Multi-iteration payload assembly appends 16-byte blocks\n until curchunk_idx reaches curchunk_len, writing up to 15 bytes past\n the end of chunk[] into msg[].\n\n3. msg[256] overflow: each chunk contributes (curchunk_len-1) bytes to\n msg[]. No check ensures curlen + (curchunk_len-1) stays within msg[256],\n so the memcpy can spill into adjacent struct fields.\n\nAll three are reachable from any DP MST device that can forge sideband\nreply messages on a physical connection."
}
],
"id": "CVE-2026-68278",
"lastModified": "2026-08-23T13:16:36.020",
"metrics": {},
"published": "2026-08-10T13:20:16.920",
"references": [
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"url": "https://git.kernel.org/stable/c/a6366b551079c79bf7bdbadd74c97358bcfe2d58"
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],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-09-30T17:42:19+00:00",
"cve": "CVE-2026-68278",
"id": "CVE-2026-68278",
"initial_release_date": "2026-08-10T00:00:00+00:00",
"product_status:known_affected": "232",
"product_status:known_not_affected": "43",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: drm/dp/mst: fix buffer overflows in sideband chunk accumulation",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68278.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-23T00:20:41Z",
"cve": "CVE-2026-68278",
"id": "CVE-2026-68278",
"initial_release_date": "2026-08-21T00:44:04Z",
"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-2026-68278",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68278.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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