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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."}], "id": "CVE-2026-23434", "lastModified": "2026-04-27T14:16:32.590", "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"}]}, "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"}], "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: 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"}], "analysis": {"en": {"generated_at": "2026-04-28T21:48:40.037893+00:00", "value": {"mitigation_remediation": ["Update the Linux kernel to a release that contains the rawnand race\u2011condition fix.", "If you build your own kernel, rebuild it with the updated MTD rawnand driver that encloses nand_lock/unlock calls with nand_get_device()/nand_release_device().", "If an immediate kernel update is not feasible, schedule maintenance so that concurrent UBI/UBIFS background erase/write operations and nand_lock/unlock calls are minimized during critical periods."], "summary": {"action": "Patch Immediately", "impact": "Data Corruption / Service Disruption"}, "threat_synthesis": {"affected_systems": "All Linux systems that use the default RBC 'mtd: rawnand' driver and have NAND flash storage are impacted. The CNA vendor list references Linux:Linux, and the list of affected CPEs includes all Linux kernel versions, so any build containing this code path is potentially vulnerable until the patch is applied.", "description_and_impact": "A race condition exists between nand_lock/unlock and other NAND operations within the Linux kernel's MTD rawnand driver. Because the driver calls chip->ops.lock_area and unlock_area without holding the device lock, concurrent UBI/UBIFS background erase/write tasks that hold the lock can interfere with PIO commands executed to set controller features. This can cause cmd_pending conflicts on the NAND controller, leading to corrupt writes, data loss, or temporary loss of controller service. The weakness is a concurrency flaw (CWE\u2011820).", "risk_and_exploitability": "The CVSS base score of 7.1 indicates high severity. The EPSS score is under 1\u202f%, suggesting a low probability of widespread exploitation. The vulnerability is not listed in CISA\u2019s KEV catalog. The likely attack vector is local: an attacker with sufficient privileges to trigger concurrent NAND operations\u2014such as a privileged user or a malicious application that initiates UBI/UBIFS background erasures while nand_lock/unlock is invoked\u2014could exploit the race. This is inferred from the description, as the official advisory does not detail an attack step. The outcome would be data corruption or a denial of service to the storage subsystem, but it does not provide remote code execution."}}}}, "created": "2026-04-03T21:14:04.018784+00:00", "updated": "2026-04-28T22:00:14.110990+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}