CVE-2026-23434

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On controllers that implement\nSET_FEATURES via multiple low-level PIO commands, these can race with\nconcurrent UBI/UBIFS background erase/write operations that hold the\ndevice lock, resulting in cmd_pending conflicts on the NAND controller.\n\nAdd nand_get_device()/nand_release_device() around the lock/unlock\noperations to serialize them against all other NAND controller access."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable path is reached through local MTD character-device ioctls such as MEMLOCK/MEMUNLOCK on /dev/mtdX, not by network packets or physical hotplug alone.\nAC:L - The attacker can repeatedly issue lock/unlock ioctls while inducing concurrent UBI/UBIFS writes or erase work, so the race is under attacker influence and can be retried.\nPR:L - The kernel path requires write access to the MTD character device but performs no capable() check beyond FMODE_WRITE; when uncertain between device-permission-dependent low and high privilege, the higher-severity PR:L is appropriate.\nUI:N - No victim action is required once the attacker has local access to the relevant MTD device and can trigger concurrent operations.\nS:U - The impact remains within the same kernel/device security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:N - The bug is a missing NAND controller serialization lock causing command-state races, with no evident kernel memory disclosure or arbitrary read primitive.\nI:H - The race can interleave lock/unlock SET_FEATURES with NAND erase/write operations, plausibly corrupting persistent flash contents or protection state; under the required uncertainty rule, this is scored as high integrity impact.\nA:H - On affected controllers such as brcmnand, the race can hit cmd_pending conflicts and BUG_ON paths, causing a kernel crash or severe storage subsystem 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The vulnerable path is reached through local MTD character-device ioctls such as MEMLOCK/MEMUNLOCK on /dev/mtdX, not by network packets or physical hotplug alone.\nAC:L - The attacker can repeatedly issue lock/unlock ioctls while inducing concurrent UBI/UBIFS writes or erase work, so the race is under attacker influence and can be retried.\nPR:L - The kernel path requires write access to the MTD character device but performs no capable() check beyond FMODE_WRITE; when uncertain between device-permission-dependent low and high privilege, the higher-severity PR:L is appropriate.\nUI:N - No victim action is required once the attacker has local access to the relevant MTD device and can trigger concurrent operations.\nS:U - The impact remains within the same kernel/device security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:N - The bug is a missing NAND controller serialization lock causing command-state races, with no evident kernel memory disclosure or arbitrary read primitive.\nI:H - The race can interleave lock/unlock SET_FEATURES with NAND erase/write operations, plausibly corrupting persistent flash contents or protection state; under the required uncertainty rule, this is scored as high integrity impact.\nA:H - On affected controllers such as brcmnand, the race can hit cmd_pending conflicts and BUG_ON paths, causing a kernel crash or severe storage subsystem failure."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "92270086b7e5ada7ab381c06cc3da2e95ed17088", "lessThan": "28ea836cc44cb8b89c1c174707ead0c1133c60e9", "versionType": "git"}, {"status": "affected", "version": "92270086b7e5ada7ab381c06cc3da2e95ed17088", "lessThan": "fe4a73c3dd48308149d57a10c2761e1d36ced7ba", "versionType": "git"}, {"status": "affected", "version": "92270086b7e5ada7ab381c06cc3da2e95ed17088", "lessThan": "ce5229e78078e437704157eb542f43a6f83b429b", "versionType": "git"}, {"status": "affected", "version": "92270086b7e5ada7ab381c06cc3da2e95ed17088", "lessThan": "a80291e577b44593a724d6cd64c14337c78f194d", "versionType": "git"}, {"status": "affected", "version": "92270086b7e5ada7ab381c06cc3da2e95ed17088", "lessThan": "f71ce0ae5aefe39dd5b2f996c0e08550d2153ad2", "versionType": "git"}, {"status": "affected", "version": "92270086b7e5ada7ab381c06cc3da2e95ed17088", "lessThan": "5fd5c078af23cb353507aa522e09d557d7eaef04", "versionType": "git"}, {"status": "affected", "version": "92270086b7e5ada7ab381c06cc3da2e95ed17088", "lessThan": "f25446e2c28939753d3b62d34dfda49952b2557d", "versionType": "git"}, {"status": "affected", "version": "92270086b7e5ada7ab381c06cc3da2e95ed17088", "lessThan": "bab2bc6e850a697a23b9e5f0e21bb8c187615e95", "versionType": "git"}], "programFiles": ["drivers/mtd/nand/raw/nand_base.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.7"}, {"status": "unaffected", "version": "0", "lessThan": "5.7", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.253", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.203", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.167", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.130", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.78", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.20", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.10", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/mtd/nand/raw/nand_base.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/28ea836cc44cb8b89c1c174707ead0c1133c60e9"}, {"url": "https://git.kernel.org/stable/c/fe4a73c3dd48308149d57a10c2761e1d36ced7ba"}, {"url": "https://git.kernel.org/stable/c/ce5229e78078e437704157eb542f43a6f83b429b"}, {"url": "https://git.kernel.org/stable/c/a80291e577b44593a724d6cd64c14337c78f194d"}, {"url": "https://git.kernel.org/stable/c/f71ce0ae5aefe39dd5b2f996c0e08550d2153ad2"}, {"url": "https://git.kernel.org/stable/c/5fd5c078af23cb353507aa522e09d557d7eaef04"}, {"url": "https://git.kernel.org/stable/c/f25446e2c28939753d3b62d34dfda49952b2557d"}, {"url": "https://git.kernel.org/stable/c/bab2bc6e850a697a23b9e5f0e21bb8c187615e95"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: rawnand: serialize lock/unlock against other NAND operations\n\nnand_lock() and nand_unlock() call into chip->ops.lock_area/unlock_area\nwithout holding the NAND device lock. On controllers that implement\nSET_FEATURES via multiple low-level PIO commands, these can race with\nconcurrent UBI/UBIFS background erase/write operations that hold the\ndevice lock, resulting in cmd_pending conflicts on the NAND controller.\n\nAdd nand_get_device()/nand_release_device() around the lock/unlock\noperations to serialize them against all other NAND controller access."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.253", "versionStartIncluding": "5.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.203", "versionStartIncluding": "5.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.167", "versionStartIncluding": "5.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.130", "versionStartIncluding": "5.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.78", "versionStartIncluding": "5.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.20", "versionStartIncluding": "5.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.10", "versionStartIncluding": "5.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "5.7"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:21:44.508Z"}}}, "cveMetadata": {"cveId": "CVE-2026-23434", "state": "PUBLISHED", "dateUpdated": "2026-11-10T12:43:10.013Z", "dateReserved": "2026-01-13T15:37:46.016Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-04-03T15:15:19.450Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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"descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: rawnand: serialize lock/unlock against other NAND operations\n\nnand_lock() and nand_unlock() call into chip->ops.lock_area/unlock_area\nwithout holding the NAND device lock. On controllers that implement\nSET_FEATURES via multiple low-level PIO commands, these can race with\nconcurrent UBI/UBIFS background erase/write operations that hold the\ndevice lock, resulting in cmd_pending conflicts on the NAND controller.\n\nAdd nand_get_device()/nand_release_device() around the lock/unlock\noperations to serialize them against all other NAND controller access."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmtd: rawnand: serializar bloqueo/desbloqueo contra otras operaciones NAND\n\nnand_lock() y nand_unlock() llaman a chip -> ops.lock_area/unlock_area sin mantener el bloqueo del dispositivo NAND. En controladores que implementan SET_FEATURES a trav\u00e9s de m\u00faltiples comandos PIO de bajo nivel, estos pueden competir con operaciones concurrentes de borrado/escritura en segundo plano de UBI/UBIFS que mantienen el bloqueo del dispositivo, resultando en conflictos de cmd_pending en el controlador NAND.\n\nA\u00f1adir nand_get_device()/nand_release_device() alrededor de las operaciones de bloqueo/desbloqueo para serializarlas contra todo otro acceso al controlador NAND."}], "id": "CVE-2026-23434", "lastModified": "2026-11-10T13:18:45.650", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "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-2026-23434", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:08:00.897129Z", "version": "2.0.3"}}]}, "published": "2026-04-03T16:16:24.913", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/28ea836cc44cb8b89c1c174707ead0c1133c60e9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5fd5c078af23cb353507aa522e09d557d7eaef04"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a80291e577b44593a724d6cd64c14337c78f194d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bab2bc6e850a697a23b9e5f0e21bb8c187615e95"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ce5229e78078e437704157eb542f43a6f83b429b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f25446e2c28939753d3b62d34dfda49952b2557d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f71ce0ae5aefe39dd5b2f996c0e08550d2153ad2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fe4a73c3dd48308149d57a10c2761e1d36ced7ba"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-362"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: mtd: rawnand: serialize lock/unlock against other NAND operations", "id": "2454813", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454813"}, "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-820", "details": ["A flaw was found in the `mtd: rawnand` subsystem of the Linux kernel. This vulnerability occurs because the `nand_lock()` and `nand_unlock()` functions do not properly coordinate with other NAND operations. This can lead to a race condition where concurrent Universal Block Image (UBI) or UBIFS background operations interfere with lock/unlock calls, causing command conflicts on the NAND controller. Such conflicts can result in system instability or a denial of service."], "name": "CVE-2026-23434", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "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": "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": "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"}], "public_date": "2026-04-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23434\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23434\nhttps://lore.kernel.org/linux-cve-announce/2026040311-CVE-2026-23434-f0f0@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[92270086b7e5ada7ab381c06cc3da2e95ed17088,ce5229e78078e437704157eb542f43a6f83b429b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[92270086b7e5ada7ab381c06cc3da2e95ed17088,a80291e577b44593a724d6cd64c14337c78f194d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[92270086b7e5ada7ab381c06cc3da2e95ed17088,f71ce0ae5aefe39dd5b2f996c0e08550d2153ad2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[92270086b7e5ada7ab381c06cc3da2e95ed17088,5fd5c078af23cb353507aa522e09d557d7eaef04)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[92270086b7e5ada7ab381c06cc3da2e95ed17088,f25446e2c28939753d3b62d34dfda49952b2557d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[92270086b7e5ada7ab381c06cc3da2e95ed17088,bab2bc6e850a697a23b9e5f0e21bb8c187615e95)"}}], "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": "generic", "value": "[0,5.7)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.167,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.130,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.78,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.20,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.10,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0-rc5,*]"}}], "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": "2026-04-03T21:14:04.018784+00:00", "updated": "2026-10-19T21:00:04.826125+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}