CVE-2026-93093

{"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": "2026-10-30T12:35:57.144Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:35:57.144Z"}, "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": "9d349c7b2392b1196e10421421ea9a09fcc5d3cc", "status": "affected", "versionType": "git"}, {"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": "6.1.191", "lessThanOrEqual": "6.1.*", "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": "6.1.191"}, {"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/9d349c7b2392b1196e10421421ea9a09fcc5d3cc"}, {"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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/firmware/arm_scmi/driver.c", "drivers/firmware/arm_scmi/transports/mailbox.c", "drivers/firmware/arm_scmi/transports/smc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "9d349c7b2392b1196e10421421ea9a09fcc5d3cc", "status": "affected", "version": "5c8a47a5a91d4d6e185f758d61997613d9c5d6ac", "versionType": "git"}, {"lessThan": "50e38091a657ad81385e2aea7e2575e17ac23d79", "status": "affected", "version": "5c8a47a5a91d4d6e185f758d61997613d9c5d6ac", "versionType": "git"}, {"lessThan": "6f3f532531e4a27d28a2240719d1b05ac11766c6", "status": "affected", "version": "5c8a47a5a91d4d6e185f758d61997613d9c5d6ac", "versionType": "git"}, {"lessThan": "1bea027f7ef6fb889628b16c568a5f7c07a51b30", "status": "affected", "version": "5c8a47a5a91d4d6e185f758d61997613d9c5d6ac", "versionType": "git"}, {"lessThan": "a1bc587568a4e373db76261dc9561dfc3653917f", "status": "affected", "version": "5c8a47a5a91d4d6e185f758d61997613d9c5d6ac", "versionType": "git"}, {"lessThan": "0314900dcdde044af0208fed212035dbfaa55843", "status": "affected", "version": "5c8a47a5a91d4d6e185f758d61997613d9c5d6ac", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/firmware/arm_scmi/driver.c", "drivers/firmware/arm_scmi/transports/mailbox.c", "drivers/firmware/arm_scmi/transports/smc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.7"}, {"lessThan": "5.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.110", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.52", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-93093", "lastModified": "2026-10-30T13:20:57.117", "metrics": {}, "published": "2026-09-17T17:18:03.300", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0314900dcdde044af0208fed212035dbfaa55843"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1bea027f7ef6fb889628b16c568a5f7c07a51b30"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/50e38091a657ad81385e2aea7e2575e17ac23d79"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6f3f532531e4a27d28a2240719d1b05ac11766c6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9d349c7b2392b1196e10421421ea9a09fcc5d3cc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a1bc587568a4e373db76261dc9561dfc3653917f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5c8a47a5a91d4d6e185f758d61997613d9c5d6ac,6f3f532531e4a27d28a2240719d1b05ac11766c6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5c8a47a5a91d4d6e185f758d61997613d9c5d6ac,1bea027f7ef6fb889628b16c568a5f7c07a51b30)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5c8a47a5a91d4d6e185f758d61997613d9c5d6ac,a1bc587568a4e373db76261dc9561dfc3653917f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5c8a47a5a91d4d6e185f758d61997613d9c5d6ac,0314900dcdde044af0208fed212035dbfaa55843)"}}], "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": "5.7"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.7)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.110,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.52,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.6,8.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-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": "2026-09-19T07:30:17.073253+00:00", "updated": "2026-09-19T14:30:07.275161+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-476"]}