{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-23434", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:46.016Z", "datePublished": "2026-04-03T15:15:19.450Z", "dateUpdated": "2026-08-05T12:21:44.508Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:21:44.508Z" }, "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." } ], "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 failure." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/mtd/nand/raw/nand_base.c" ], "versions": [ { "version": "92270086b7e5ada7ab381c06cc3da2e95ed17088", "lessThan": "28ea836cc44cb8b89c1c174707ead0c1133c60e9", "status": "affected", "versionType": "git" }, { "version": "92270086b7e5ada7ab381c06cc3da2e95ed17088", "lessThan": "fe4a73c3dd48308149d57a10c2761e1d36ced7ba", "status": "affected", "versionType": "git" }, { "version": "92270086b7e5ada7ab381c06cc3da2e95ed17088", "lessThan": "ce5229e78078e437704157eb542f43a6f83b429b", "status": "affected", "versionType": "git" }, { "version": "92270086b7e5ada7ab381c06cc3da2e95ed17088", "lessThan": "a80291e577b44593a724d6cd64c14337c78f194d", "status": "affected", "versionType": "git" }, { "version": "92270086b7e5ada7ab381c06cc3da2e95ed17088", "lessThan": "f71ce0ae5aefe39dd5b2f996c0e08550d2153ad2", "status": "affected", "versionType": "git" }, { "version": "92270086b7e5ada7ab381c06cc3da2e95ed17088", "lessThan": "5fd5c078af23cb353507aa522e09d557d7eaef04", "status": "affected", "versionType": "git" }, { "version": "92270086b7e5ada7ab381c06cc3da2e95ed17088", "lessThan": "f25446e2c28939753d3b62d34dfda49952b2557d", "status": "affected", "versionType": "git" }, { "version": "92270086b7e5ada7ab381c06cc3da2e95ed17088", "lessThan": "bab2bc6e850a697a23b9e5f0e21bb8c187615e95", "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/mtd/nand/raw/nand_base.c" ], "versions": [ { "version": "5.7", "status": "affected" }, { "version": "0", "lessThan": "5.7", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.167", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.78", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.20", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.10", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "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": "5.10.253" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.15.203" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.1.167" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.6.130" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.12.78" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.18.20" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.19.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "7.0" } ] } ] } ], "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" } ], "title": "mtd: rawnand: serialize lock/unlock against other NAND operations", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-07-14T12:47:00.444Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html" }, { "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html" } ] } ] } }