CVE-2026-80806
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: ext4: don't enable DAX on new encrypted files Currently, when a new encrypted regular file is created, the call to ext4_set_inode_flags(inode, init=true) in __ext4_new_inode() is made before EXT4_INODE_ENCRYPT is set. As a result, it can set S_DAX if the filesystem is mounted with "-o dax=always". EXT4_INODE_ENCRYPT then actually gets set a bit later in __ext4_new_inode(), when it calls fscrypt_set_context() which calls ext4_set_context(). ext4_set_context() sets EXT4_INODE_ENCRYPT and calls ext4_set_inode_flags(inode, init=false) to set S_ENCRYPTED too. This was intended to clear S_DAX as well. However, this was broken by commit 043546e46dc7 ("fs/ext4: Only change S_DAX on inode load"). This causes data written to the file to bypass encryption, also causing xfstests failures such as generic/548 (when "-o dax=always" is used). Fix this by simplifying the flow by making __ext4_new_inode() set EXT4_INODE_ENCRYPT earlier. This makes it take effect in ext4_set_inode_flags(inode, init=true), making S_DAX never be set. Similarly, make EXT4_STATE_MAY_INLINE_DATA never be set in the first place on new encrypted inodes. Then it doesn't need to be cleared. As a result of these simplifications, ext4_set_context() no longer needs to change inode flags or state when 'handle != NULL'. Remove that too.
Severity
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-09-04 16:18:07.647000
Last modified
2026-10-19 09:17:15.243000
View original CVE JSON
{
"id": "CVE-2026-80806",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-09-04T16:18:07.647",
"lastModified": "2026-10-19T09:17:15.243",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"fs/ext4/crypto.c",
"fs/ext4/ialloc.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
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"versionType": "git",
"status": "affected"
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"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"fs/ext4/crypto.c",
"fs/ext4/ialloc.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "5.8",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.8",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.10.269",
"lessThanOrEqual": "5.10.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.220",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.187",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.156",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.108",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.47",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.1.11",
"lessThanOrEqual": "7.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.1",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
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}