CVE-2026-68277
Full vulnerability record from the local CVENow database.
Description
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
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-08-10 13:20:16.803000
Last modified
2026-11-06 17:19:27.493000
View original CVE JSON
{
"id": "CVE-2026-68277",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-08-10T13:20:16.803",
"lastModified": "2026-11-06T17:19:27.493",
"vulnStatus": "Received",
"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->msg[idx] << 8) | (raw->msg[idx+1]);\n\nand check bounds only after the fact. When idx == raw->curlen,\nraw->msg[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 > curlen) before each\n2-byte read. Since the check is strictly tighter than idx > curlen,\nno separate step is needed.\n\n[added fixes tag]"
}
],
"affected": [
{
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"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"drivers/gpu/drm/display/drm_dp_mst_topology.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
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{
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{
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"status": "unaffected"
},
{
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected"
},
{
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"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.148",
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"status": "unaffected"
},
{
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},
{
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{
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{
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}
]
}
],
"metrics": {
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-11-06T16:46:26.186383Z",
"id": "CVE-2026-68277",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
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"references": [
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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