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CVE-2026-80806 (GCVE-0-2026-80806)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:13 – Updated: 2026-09-04 15:13
VLAI
Title
ext4: don't enable DAX on new encrypted files
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 043546e46dc70c25ff7e2cf6d09cbb0424fc9978 , < add98959b220935b243170214c787bc03044a44d (git)
Affected: 043546e46dc70c25ff7e2cf6d09cbb0424fc9978 , < f53b325068bca0b238c3e0d2eb7de9b1f2268cab (git)
Affected: 043546e46dc70c25ff7e2cf6d09cbb0424fc9978 , < 5959cad3cfa852ec07bbdaf9c17f4838a94a8e6c (git)
Affected: 043546e46dc70c25ff7e2cf6d09cbb0424fc9978 , < a13f61ba9b2a7a4ff1f140949ccfad23c5313757 (git)
Affected: 043546e46dc70c25ff7e2cf6d09cbb0424fc9978 , < ed1cd834da65db127f1c30ff67e78f14825a06c1 (git)
Affected: 043546e46dc70c25ff7e2cf6d09cbb0424fc9978 , < 458776af0061afec1014cb3cd0061e282e482e83 (git)
Affected: 043546e46dc70c25ff7e2cf6d09cbb0424fc9978 , < 3392391b363a63ebb531d45318a729b1c998565b (git)
Affected: 043546e46dc70c25ff7e2cf6d09cbb0424fc9978 , < e27bae352158c007143d5bb50f3af33a177c0a37 (git)
Affected: 043546e46dc70c25ff7e2cf6d09cbb0424fc9978 , < da32af420d6d466e247c43ac0b829edeac7ae0ad (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.269 , ≤ 5.10.* (semver)
Unaffected: 5.15.220 , ≤ 5.15.* (semver)
Unaffected: 6.1.187 , ≤ 6.1.* (semver)
Unaffected: 6.6.156 , ≤ 6.6.* (semver)
Unaffected: 6.12.108 , ≤ 6.12.* (semver)
Unaffected: 6.18.47 , ≤ 6.18.* (semver)
Unaffected: 7.1.11 , ≤ 7.1.* (semver)
Unaffected: 7.2.1 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
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          "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."
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      "title": "ext4: don\u0027t enable DAX on new encrypted files",
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      "product_status:known_affected": "1",
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      "title": "ext4: don\u0027t enable DAX on new encrypted files",
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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.  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    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T01:51:18Z",
      "cve": "CVE-2026-80806",
      "id": "CVE-2026-80806",
      "initial_release_date": "2026-09-05T00:27:00Z",
      "product_status:known_affected": "224",
      "product_status:known_not_affected": "117",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80806",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80806.json",
      "version": "4"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.