{"id":"CVE-2026-80806","summary":"ext4: don't enable DAX on new encrypted files","details":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: don't enable DAX on new encrypted files\n\nCurrently, when a new encrypted regular file is created, the call to\next4_set_inode_flags(inode, init=true) in __ext4_new_inode() is made\nbefore EXT4_INODE_ENCRYPT is set.  As a result, it can set S_DAX if the\nfilesystem is mounted with \"-o dax=always\".\n\nEXT4_INODE_ENCRYPT then actually gets set a bit later in\n__ext4_new_inode(), when it calls fscrypt_set_context() which calls\next4_set_context().  ext4_set_context() sets EXT4_INODE_ENCRYPT and\ncalls ext4_set_inode_flags(inode, init=false) to set S_ENCRYPTED too.\n\nThis was intended to clear S_DAX as well.  However, this was broken by\ncommit 043546e46dc7 (\"fs/ext4: Only change S_DAX on inode load\").  This\ncauses data written to the file to bypass encryption, also causing\nxfstests failures such as generic/548 (when \"-o dax=always\" is used).\n\nFix this by simplifying the flow by making __ext4_new_inode() set\nEXT4_INODE_ENCRYPT earlier.  This makes it take effect in\next4_set_inode_flags(inode, init=true), making S_DAX never be set.\n\nSimilarly, make EXT4_STATE_MAY_INLINE_DATA never be set in the first\nplace on new encrypted inodes.  Then it doesn't need to be cleared.\n\nAs a result of these simplifications, ext4_set_context() no longer needs\nto change inode flags or state when 'handle != NULL'.  Remove that too.","modified":"2026-09-06T03:46:47.262265088Z","published":"2026-09-04T15:13:20.282Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80806.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3392391b363a63ebb531d45318a729b1c998565b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/458776af0061afec1014cb3cd0061e282e482e83"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5959cad3cfa852ec07bbdaf9c17f4838a94a8e6c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a13f61ba9b2a7a4ff1f140949ccfad23c5313757"},{"type":"WEB","url":"https://git.kernel.org/stable/c/add98959b220935b243170214c787bc03044a44d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/da32af420d6d466e247c43ac0b829edeac7ae0ad"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e27bae352158c007143d5bb50f3af33a177c0a37"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ed1cd834da65db127f1c30ff67e78f14825a06c1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f53b325068bca0b238c3e0d2eb7de9b1f2268cab"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80806.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80806"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"043546e46dc70c25ff7e2cf6d09cbb0424fc9978"},{"fixed":"add98959b220935b243170214c787bc03044a44d"},{"fixed":"f53b325068bca0b238c3e0d2eb7de9b1f2268cab"},{"fixed":"5959cad3cfa852ec07bbdaf9c17f4838a94a8e6c"},{"fixed":"a13f61ba9b2a7a4ff1f140949ccfad23c5313757"},{"fixed":"ed1cd834da65db127f1c30ff67e78f14825a06c1"},{"fixed":"458776af0061afec1014cb3cd0061e282e482e83"},{"fixed":"3392391b363a63ebb531d45318a729b1c998565b"},{"fixed":"e27bae352158c007143d5bb50f3af33a177c0a37"},{"fixed":"da32af420d6d466e247c43ac0b829edeac7ae0ad"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80806.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.8.0"},{"fixed":"5.10.269"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.220"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.187"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.156"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.108"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.47"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.11"}]},{"type":"ECOSYSTEM","events":[{"introduced":"7.2.0"},{"fixed":"7.2.1"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80806.json"}}],"schema_version":"1.9.0"}