FKIE_CVE-2026-80806

Vulnerability from fkie_nvd - Published: 2026-09-04 16:18 - Updated: 2026-10-19 09:17
Severity
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3392391b363a63ebb531d45318a729b1c998565b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/458776af0061afec1014cb3cd0061e282e482e83
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5959cad3cfa852ec07bbdaf9c17f4838a94a8e6c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a13f61ba9b2a7a4ff1f140949ccfad23c5313757
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/add98959b220935b243170214c787bc03044a44d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/da32af420d6d466e247c43ac0b829edeac7ae0ad
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e27bae352158c007143d5bb50f3af33a177c0a37
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ed1cd834da65db127f1c30ff67e78f14825a06c1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f53b325068bca0b238c3e0d2eb7de9b1f2268cab
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/crypto.c",
            "fs/ext4/ialloc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "add98959b220935b243170214c787bc03044a44d",
              "status": "affected",
              "version": "043546e46dc70c25ff7e2cf6d09cbb0424fc9978",
              "versionType": "git"
            },
            {
              "lessThan": "f53b325068bca0b238c3e0d2eb7de9b1f2268cab",
              "status": "affected",
              "version": "043546e46dc70c25ff7e2cf6d09cbb0424fc9978",
              "versionType": "git"
            },
            {
              "lessThan": "5959cad3cfa852ec07bbdaf9c17f4838a94a8e6c",
              "status": "affected",
              "version": "043546e46dc70c25ff7e2cf6d09cbb0424fc9978",
              "versionType": "git"
            },
            {
              "lessThan": "a13f61ba9b2a7a4ff1f140949ccfad23c5313757",
              "status": "affected",
              "version": "043546e46dc70c25ff7e2cf6d09cbb0424fc9978",
              "versionType": "git"
            },
            {
              "lessThan": "ed1cd834da65db127f1c30ff67e78f14825a06c1",
              "status": "affected",
              "version": "043546e46dc70c25ff7e2cf6d09cbb0424fc9978",
              "versionType": "git"
            },
            {
              "lessThan": "458776af0061afec1014cb3cd0061e282e482e83",
              "status": "affected",
              "version": "043546e46dc70c25ff7e2cf6d09cbb0424fc9978",
              "versionType": "git"
            },
            {
              "lessThan": "3392391b363a63ebb531d45318a729b1c998565b",
              "status": "affected",
              "version": "043546e46dc70c25ff7e2cf6d09cbb0424fc9978",
              "versionType": "git"
            },
            {
              "lessThan": "e27bae352158c007143d5bb50f3af33a177c0a37",
              "status": "affected",
              "version": "043546e46dc70c25ff7e2cf6d09cbb0424fc9978",
              "versionType": "git"
            },
            {
              "lessThan": "da32af420d6d466e247c43ac0b829edeac7ae0ad",
              "status": "affected",
              "version": "043546e46dc70c25ff7e2cf6d09cbb0424fc9978",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/crypto.c",
            "fs/ext4/ialloc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.8"
            },
            {
              "lessThan": "5.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.269",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.220",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.187",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.156",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.108",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.47",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: don\u0027t 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\u0027t need to be cleared.\n\nAs a result of these simplifications, ext4_set_context() no longer needs\nto change inode flags or state when \u0027handle != NULL\u0027.  Remove that too."
    }
  ],
  "id": "CVE-2026-80806",
  "lastModified": "2026-10-19T09:17:15.243",
  "metrics": {},
  "published": "2026-09-04T16:18:07.647",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3392391b363a63ebb531d45318a729b1c998565b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/458776af0061afec1014cb3cd0061e282e482e83"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5959cad3cfa852ec07bbdaf9c17f4838a94a8e6c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a13f61ba9b2a7a4ff1f140949ccfad23c5313757"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/add98959b220935b243170214c787bc03044a44d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/da32af420d6d466e247c43ac0b829edeac7ae0ad"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e27bae352158c007143d5bb50f3af33a177c0a37"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ed1cd834da65db127f1c30ff67e78f14825a06c1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f53b325068bca0b238c3e0d2eb7de9b1f2268cab"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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