CVE-2024-42279

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The core provides a register that will empty the RX and\nTX FIFOs, so do that before each transfer."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable `mchp_corespi_transfer_one()` path is entered from the SPI core, reachable locally through spidev ioctls (`SPI_IOC_MESSAGE`) or by driving any in-kernel SPI client; no network or physical access to the board is needed.\nAC:L - The attacker can reliably dirty the RX FIFO with back-to-back transfers (including transfers larger than the 32-byte FIFO that provoke `INT_RX_CHANNEL_OVERFLOW`, or aborted transfers), and the residue is sticky rather than probabilistic, so no condition outside the attacker's control is required.\nPR:L - Only ordinary local access to an SPI device node (commonly group-accessible on embedded platforms) or the ability to trigger an SPI client is needed; there is no capability check anywhere on the path from the ioctl to `transfer_one`.\nUI:N - The attacker issues the transfers themselves and the stale-FIFO condition persists on its own; no victim action is required.\nS:U - The impact stays within the kernel and the SPI controller managed by it; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Bytes clocked in during a previous transaction \u2014 from any device on the shared bus, including a TPM, secure element, or the boot/root SPI flash \u2014 are copied into the attacker's RX buffer, and the leak can be repeated indefinitely, so security-critical data transiting the bus can be siphoned across driver and process boundaries.\nI:H - Residue from the attacker's own transaction is prepended into the next client's `rx_buf`, and an attacker transacting with a readback-capable slave controls those bytes exactly, allowing chosen data to be injected into another driver's input \u2014 e.g. corrupting a secure-element/TPM response or data read from the root flash.\nA:H - The residue count never clears, so once the FIFO fills every subsequent transfer overflows and returns garbage, permanently breaking every device on the controller (rootfs SPI-NOR, watchdog, sensors) until reboot, with SPI core transfer timeouts and `dev_err` spam."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/spi/spi-microchip-core.c"], "versions": [{"version": "9ac8d17694b66d54b13e9718b25c14ca36dbebbd", "lessThan": "950375a0ba7d6c82ea5b5a44dd48a9e41fa45826", "status": "affected", "versionType": "git"}, {"version": "9ac8d17694b66d54b13e9718b25c14ca36dbebbd", "lessThan": "3feda3677e8bbe833c3a62a4091377a08f015b80", "status": "affected", "versionType": "git"}, {"version": "9ac8d17694b66d54b13e9718b25c14ca36dbebbd", "lessThan": "45e03d35229b680b79dfea1103a1f2f07d0b5d75", "status": "affected", "versionType": "git"}, {"version": "9ac8d17694b66d54b13e9718b25c14ca36dbebbd", "lessThan": "9cf71eb0faef4bff01df4264841b8465382d7927", "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/spi/spi-microchip-core.c"], "versions": [{"version": "6.0", "status": "affected"}, {"version": "0", "lessThan": "6.0", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.44", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.10.3", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.11", "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": "6.0", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.6.44"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.10.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.11"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/950375a0ba7d6c82ea5b5a44dd48a9e41fa45826"}, {"url": "https://git.kernel.org/stable/c/3feda3677e8bbe833c3a62a4091377a08f015b80"}, {"url": "https://git.kernel.org/stable/c/45e03d35229b680b79dfea1103a1f2f07d0b5d75"}, {"url": "https://git.kernel.org/stable/c/9cf71eb0faef4bff01df4264841b8465382d7927"}], "title": "spi: microchip-core: ensure TX and RX FIFOs are empty at start of a transfer", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-42279", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T16:11:42.802690Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-12T17:33:31.191Z"}}]}}

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there is no capability check anywhere on the path from the ioctl to `transfer_one`.\nUI:N - The attacker issues the transfers themselves and the stale-FIFO condition persists on its own; no victim action is required.\nS:U - The impact stays within the kernel and the SPI controller managed by it; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Bytes clocked in during a previous transaction \u2014 from any device on the shared bus, including a TPM, secure element, or the boot/root SPI flash \u2014 are copied into the attacker's RX buffer, and the leak can be repeated indefinitely, so security-critical data transiting the bus can be siphoned across driver and process boundaries.\nI:H - Residue from the attacker's own transaction is prepended into the next client's `rx_buf`, and an attacker transacting with a readback-capable slave controls those bytes exactly, allowing chosen data to be injected into another driver's input \u2014 e.g. corrupting a secure-element/TPM response or data read from the root flash.\nA:H - The residue count never clears, so once the FIFO fills every subsequent transfer overflows and returns garbage, permanently breaking every device on the controller (rootfs SPI-NOR, watchdog, sensors) until reboot, with SPI core transfer timeouts and `dev_err` spam."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "9ac8d17694b66d54b13e9718b25c14ca36dbebbd", "lessThan": "950375a0ba7d6c82ea5b5a44dd48a9e41fa45826", "versionType": "git"}, {"status": "affected", "version": "9ac8d17694b66d54b13e9718b25c14ca36dbebbd", "lessThan": "3feda3677e8bbe833c3a62a4091377a08f015b80", "versionType": "git"}, {"status": "affected", "version": "9ac8d17694b66d54b13e9718b25c14ca36dbebbd", "lessThan": "45e03d35229b680b79dfea1103a1f2f07d0b5d75", "versionType": "git"}, {"status": "affected", "version": "9ac8d17694b66d54b13e9718b25c14ca36dbebbd", "lessThan": "9cf71eb0faef4bff01df4264841b8465382d7927", "versionType": "git"}], "programFiles": ["drivers/spi/spi-microchip-core.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.0"}, {"status": "unaffected", "version": "0", "lessThan": "6.0", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.191", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.44", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.10.3", "versionType": "semver", "lessThanOrEqual": "6.10.*"}, {"status": "unaffected", "version": "6.11", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/spi/spi-microchip-core.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/950375a0ba7d6c82ea5b5a44dd48a9e41fa45826"}, {"url": "https://git.kernel.org/stable/c/3feda3677e8bbe833c3a62a4091377a08f015b80"}, {"url": "https://git.kernel.org/stable/c/45e03d35229b680b79dfea1103a1f2f07d0b5d75"}, {"url": "https://git.kernel.org/stable/c/9cf71eb0faef4bff01df4264841b8465382d7927"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nspi: microchip-core: ensure TX and RX FIFOs are empty at start of a transfer\n\nWhile transmitting with rx_len == 0, the RX FIFO is not going to be\nemptied in the interrupt handler. A subsequent transfer could then\nread crap from the previous transfer out of the RX FIFO into the\nstart RX buffer. The core provides a register that will empty the RX and\nTX FIFOs, so do that before each transfer."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.191", "versionStartIncluding": "6.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.44", "versionStartIncluding": "6.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.10.3", "versionStartIncluding": "6.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.11", "versionStartIncluding": "6.0"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:19:01.283Z"}}}, "cveMetadata": {"cveId": "CVE-2024-42279", "state": "PUBLISHED", "dateUpdated": "2026-10-30T12:19:01.283Z", "dateReserved": "2024-07-30T07:40:12.261Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-08-17T09:08:46.829Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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A subsequent transfer could then\nread crap from the previous transfer out of the RX FIFO into the\nstart RX buffer. The core provides a register that will empty the RX and\nTX FIFOs, so do that before each transfer."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: spi: microchip-core: aseg\u00farese de que los FIFO de TX y RX est\u00e9n vac\u00edos al inicio de una transferencia. Mientras se transmite con rx_len == 0, el FIFO de RX no se vaciar\u00e1 en la interrupci\u00f3n entrenador de animales. Una transferencia posterior podr\u00eda leer basura de la transferencia anterior desde el RX FIFO al b\u00fafer de inicio de RX. El n\u00facleo proporciona un registro que vaciar\u00e1 los FIFO RX y TX, as\u00ed que h\u00e1galo antes de cada transferencia."}], "id": "CVE-2024-42279", "lastModified": "2026-10-30T13:17:33.150", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-42279", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T16:11:42.802690Z", "version": "2.0.3"}}]}, "published": "2024-08-17T09:15:08.880", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3feda3677e8bbe833c3a62a4091377a08f015b80"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/45e03d35229b680b79dfea1103a1f2f07d0b5d75"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/950375a0ba7d6c82ea5b5a44dd48a9e41fa45826"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9cf71eb0faef4bff01df4264841b8465382d7927"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: spi: microchip-core: ensure TX and RX FIFOs are empty at start of a transfer", "id": "2305424", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2305424"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L", "status": "draft"}, "cwe": "CWE-388", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nspi: microchip-core: ensure TX and RX FIFOs are empty at start of a transfer\nWhile transmitting with rx_len == 0, the RX FIFO is not going to be\nemptied in the interrupt handler. A subsequent transfer could then\nread crap from the previous transfer out of the RX FIFO into the\nstart RX buffer. The core provides a register that will empty the RX and\nTX FIFOs, so do that before each transfer."], "name": "CVE-2024-42279", "package_state": [{"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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-08-17T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-42279\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-42279\nhttps://lore.kernel.org/linux-cve-announce/2024081742-CVE-2024-42279-91b0@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-13T11:30:57.076976+00:00", "updated": "2025-07-13T11:30:57.077051+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}