CVE-2026-68277

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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": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpu/drm/display/drm_dp_mst_topology.c"], "versions": [{"version": "ad7f8a1f9ced7f049f9b66d588723f243a7034cd", "lessThan": "c1f72a13d54ffd16647d3fa540d961f5deba8790", "status": "affected", "versionType": "git"}, {"version": "ad7f8a1f9ced7f049f9b66d588723f243a7034cd", "lessThan": "192e146c2d57ad033b0d418ec64ee390f8dc074e", "status": "affected", "versionType": "git"}, {"version": "ad7f8a1f9ced7f049f9b66d588723f243a7034cd", "lessThan": "6e3107e6522109a07fc9bb0fc4ec463f1982e113", "status": "affected", "versionType": "git"}, {"version": "ad7f8a1f9ced7f049f9b66d588723f243a7034cd", "lessThan": "bdf0508b1e6785d4a8982c637e97e68d60b47d7b", "status": "affected", "versionType": "git"}, {"version": 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"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.17", "versionEndExcluding": "7.2"}]}]}], "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": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-68277", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T16:46:26.186383Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T16:55:11.718Z"}}]}}

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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]"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.266", "versionStartIncluding": "3.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.217", "versionStartIncluding": "3.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.183", "versionStartIncluding": "3.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.148", "versionStartIncluding": "3.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.101", "versionStartIncluding": "3.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.42", "versionStartIncluding": "3.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.6", "versionStartIncluding": "3.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "3.17"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-23T12:46:14.372Z"}}}, "cveMetadata": {"cveId": "CVE-2026-68277", "state": "PUBLISHED", "dateUpdated": "2026-11-06T16:55:11.718Z", "dateReserved": "2026-07-30T09:28:09.379Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-10T12:01:53.085Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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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]"}], "id": "CVE-2026-68277", "lastModified": "2026-11-06T17:19:27.493", "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-68277", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:46:26.186383Z", "version": "2.0.3"}}]}, "published": "2026-08-10T13:20:16.803", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0bcd7675c69a2462a8531fcd9e4d096e9c7ec5df"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/192e146c2d57ad033b0d418ec64ee390f8dc074e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/68a624416d1dd481b3e5b7ea0e8a070a9b8a2c73"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6b89ba3dba2f583626fb693e47e951ffb8bf591f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6e3107e6522109a07fc9bb0fc4ec463f1982e113"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bdf0508b1e6785d4a8982c637e97e68d60b47d7b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c1f72a13d54ffd16647d3fa540d961f5deba8790"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d5c70523cafa26ad2c7a37b612849abe2683baa8"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: drm/dp/mst: fix OOB reads on 2-byte fields in sideband reply parsers", "id": "2513396", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513396"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/dp/mst: fix OOB reads on 2-byte fields in sideband reply parsers\nThree sideband reply parsers read 16-bit fields as:\nval = (raw->msg[idx] << 8) | (raw->msg[idx+1]);\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).\nAffected functions:\n- drm_dp_sideband_parse_enum_path_resources_ack()\nfull_payload_bw_number and avail_payload_bw_number fields\n- drm_dp_sideband_parse_allocate_payload_ack()\nallocated_pbn field\n- drm_dp_sideband_parse_query_payload_ack()\nallocated_pbn field\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[added fixes tag]", "A flaw was found in the Linux kernel's `drm/dp/mst` (Direct Rendering Manager/DisplayPort/Multi-Stream Transport) sideband reply parsers. This out-of-bounds read vulnerability occurs when processing 2-byte fields in sideband replies, where the system attempts to read beyond the allocated buffer. A local attacker could potentially exploit this to read sensitive information from adjacent memory locations, leading to information disclosure."], "name": "CVE-2026-68277", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-10T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68277\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68277\nhttps://lore.kernel.org/linux-cve-announce/2026081025-CVE-2026-68277-f1cf@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ad7f8a1f9ced7f049f9b66d588723f243a7034cd,bdf0508b1e6785d4a8982c637e97e68d60b47d7b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ad7f8a1f9ced7f049f9b66d588723f243a7034cd,0bcd7675c69a2462a8531fcd9e4d096e9c7ec5df)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ad7f8a1f9ced7f049f9b66d588723f243a7034cd,d5c70523cafa26ad2c7a37b612849abe2683baa8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ad7f8a1f9ced7f049f9b66d588723f243a7034cd,68a624416d1dd481b3e5b7ea0e8a070a9b8a2c73)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ad7f8a1f9ced7f049f9b66d588723f243a7034cd,6b89ba3dba2f583626fb693e47e951ffb8bf591f)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.17"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.17)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.148,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-10T17:30:18.000374+00:00", "updated": "2026-08-13T04:30:06.243697+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}