{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-93093",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-17T16:02:15.084Z",
        "datePublished": "2026-09-17T16:11:08.360Z",
        "dateUpdated": "2026-10-21T12:51:52.039Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-21T12:51:52.039Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: arm_scmi: Publish channel state before callbacks\n\nTransport setup can enable callbacks before the setup routine returns.\nmailbox_chan_setup() registers the mailbox client with\nmbox_request_channel(), and the mailbox controller startup path can enable\ninterrupt delivery before SCMI mailbox channel state has been published.\nSimilarly, smc_chan_setup() requests the optional A2P completion IRQ before\nthe SMC transport has made its cinfo pointer visible.\n\nIf a pending or spurious callback fires in those windows, the transport RX\ncallback can dereference a NULL transport cinfo pointer. Publishing only\nthe transport-private pointer is not sufficient either: an early callback\ncan enter the SCMI core before scmi_chan_setup() has assigned\ncinfo->handle.\nThe core derives scmi_info from cinfo->handle in the RX path, so a NULL\nhandle can still fault even when the transport-private cinfo is valid.\n\nAssign cinfo->handle before invoking the transport setup callback. Publish\nthe mailbox and SMC transport-private channel state before requesting the\nmailbox channels or IRQ, and clear the early-published pointers again on\nsetup failure. Also unwind mailbox setup devres resources on failure so an\noptional RX setup error that is ignored by the core does not leave stale\ntransport state behind."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/firmware/arm_scmi/driver.c",
                        "drivers/firmware/arm_scmi/transports/mailbox.c",
                        "drivers/firmware/arm_scmi/transports/smc.c"
                    ],
                    "versions": [
                        {
                            "version": "5c8a47a5a91d4d6e185f758d61997613d9c5d6ac",
                            "lessThan": "50e38091a657ad81385e2aea7e2575e17ac23d79",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5c8a47a5a91d4d6e185f758d61997613d9c5d6ac",
                            "lessThan": "6f3f532531e4a27d28a2240719d1b05ac11766c6",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5c8a47a5a91d4d6e185f758d61997613d9c5d6ac",
                            "lessThan": "1bea027f7ef6fb889628b16c568a5f7c07a51b30",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5c8a47a5a91d4d6e185f758d61997613d9c5d6ac",
                            "lessThan": "a1bc587568a4e373db76261dc9561dfc3653917f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5c8a47a5a91d4d6e185f758d61997613d9c5d6ac",
                            "lessThan": "0314900dcdde044af0208fed212035dbfaa55843",
                            "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/firmware/arm_scmi/driver.c",
                        "drivers/firmware/arm_scmi/transports/mailbox.c",
                        "drivers/firmware/arm_scmi/transports/smc.c"
                    ],
                    "versions": [
                        {
                            "version": "5.7",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.7",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.160",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.110",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.52",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.6",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "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": "5.7",
                                    "versionEndExcluding": "6.6.160"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.7",
                                    "versionEndExcluding": "6.12.110"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.7",
                                    "versionEndExcluding": "6.18.52"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.7",
                                    "versionEndExcluding": "7.2.6"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.7",
                                    "versionEndExcluding": "7.3"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/50e38091a657ad81385e2aea7e2575e17ac23d79"
                },
                {
                    "url": "https://git.kernel.org/stable/c/6f3f532531e4a27d28a2240719d1b05ac11766c6"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1bea027f7ef6fb889628b16c568a5f7c07a51b30"
                },
                {
                    "url": "https://git.kernel.org/stable/c/a1bc587568a4e373db76261dc9561dfc3653917f"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0314900dcdde044af0208fed212035dbfaa55843"
                }
            ],
            "title": "firmware: arm_scmi: Publish channel state before callbacks",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}