CVE-2026-68279 (GCVE-0-2026-68279)
Vulnerability from cvelistv5
Published
2026-08-10 12:02
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 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]
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: ad7f8a1f9ced7f049f9b66d588723f243a7034cd Version: ad7f8a1f9ced7f049f9b66d588723f243a7034cd Version: ad7f8a1f9ced7f049f9b66d588723f243a7034cd Version: ad7f8a1f9ced7f049f9b66d588723f243a7034cd Version: ad7f8a1f9ced7f049f9b66d588723f243a7034cd Version: ad7f8a1f9ced7f049f9b66d588723f243a7034cd Version: ad7f8a1f9ced7f049f9b66d588723f243a7034cd Version: ad7f8a1f9ced7f049f9b66d588723f243a7034cd |
||
{
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"version": "5.10.266",
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},
{
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"version": "5.15.217",
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},
{
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{
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}
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}
],
"cpeApplicability": [
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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 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]"
}
],
"providerMetadata": {
"dateUpdated": "2026-08-23T12:46:16.563Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/185de1d74e658e2edb723ba76fa61903f77d8a68"
},
{
"url": "https://git.kernel.org/stable/c/d7b9b1e33b4ed8c48d4db6e6e21c257ebbbb2586"
},
{
"url": "https://git.kernel.org/stable/c/c2fbda0fe0163c55ba3820ee6cea0c6b43622eda"
},
{
"url": "https://git.kernel.org/stable/c/22d9f7fc1aaabaf73d5f30e8b0c9aa814ecd6ed2"
},
{
"url": "https://git.kernel.org/stable/c/04d953f50d61e542e94a5977822cc53735f8c0ce"
},
{
"url": "https://git.kernel.org/stable/c/533d9e2bede4aeefdc2a0561d7071cfede95958f"
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{
"url": "https://git.kernel.org/stable/c/e6ef5455b06cb4e5d181aabcd723791587c79f12"
},
{
"url": "https://git.kernel.org/stable/c/1a8f537f5a1eeac941f262fe73078d6b08ba83c0"
}
],
"title": "drm/dp/mst: fix OOB reads in remote DPCD/I2C sideband reply parsers",
"x_generator": {
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}
},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-68279",
"datePublished": "2026-08-10T12:02:09.423Z",
"dateReserved": "2026-07-30T09:28:09.379Z",
"dateUpdated": "2026-08-23T12:46:16.563Z",
"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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