{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-68278",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-30T09:28:09.379Z",
        "datePublished": "2026-08-10T12:01:54.285Z",
        "dateUpdated": "2026-08-23T12:46:15.450Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-23T12:46:15.450Z"
            },
            "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 >= 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."
                }
            ],
            "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": "ef2ecb6cf268debf3890df99fea01b6452dcf78e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ad7f8a1f9ced7f049f9b66d588723f243a7034cd",
                            "lessThan": "d4e05dedb252ed3e540a0c9be511e427f098110a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ad7f8a1f9ced7f049f9b66d588723f243a7034cd",
                            "lessThan": "4d5109075a787de28c9e89940f9dee45269f91fa",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ad7f8a1f9ced7f049f9b66d588723f243a7034cd",
                            "lessThan": "53937a2787d29c7a460e984dc4f20ff6ac91dc65",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ad7f8a1f9ced7f049f9b66d588723f243a7034cd",
                            "lessThan": "ef0dbcc200c3389f1f781ab181932a97e54b51af",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ad7f8a1f9ced7f049f9b66d588723f243a7034cd",
                            "lessThan": "1e5827839ad0ceb0079d1560c321fa3656b54f21",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ad7f8a1f9ced7f049f9b66d588723f243a7034cd",
                            "lessThan": "a6366b551079c79bf7bdbadd74c97358bcfe2d58",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ad7f8a1f9ced7f049f9b66d588723f243a7034cd",
                            "lessThan": "55bd5e685bda455b9b50c835f8c8442d52a344a3",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "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": "3.17",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "3.17",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.266",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.217",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.183",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.148",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.101",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.42",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.6",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.17",
                                    "versionEndExcluding": "5.10.266"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.17",
                                    "versionEndExcluding": "5.15.217"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.17",
                                    "versionEndExcluding": "6.1.183"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.17",
                                    "versionEndExcluding": "6.6.148"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.17",
                                    "versionEndExcluding": "6.12.101"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.17",
                                    "versionEndExcluding": "6.18.42"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.17",
                                    "versionEndExcluding": "7.1.6"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.17",
                                    "versionEndExcluding": "7.2"
                                }
                            ]
                        }
                    ]
                }
            ],
            "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"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1e5827839ad0ceb0079d1560c321fa3656b54f21"
                },
                {
                    "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": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}