{"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":"2026-09-08T08:46:09.470Z"},"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: 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