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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)
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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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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": "2026-09-15T01:08:03Z",
      "cve": "CVE-2026-80806",
      "id": "CVE-2026-80806",
      "initial_release_date": "2026-09-05T00:27:00Z",
      "product_status:known_affected": "236",
      "product_status:known_not_affected": "117",
      "product_status:recommended": "4",
      "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": "5"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.