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ext4: skip extra isize expansion during mount to prevent deadlock

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ext4: skip extra isize expansion during mount to prevent deadlock ext4_try_to_expand_extra_isize() is called from __ext4_mark_inode_dirty() while holding an active jbd2 handle. During mount (!SB_ACTIVE), the expand path may move xattrs to external blocks and release ea_inodes via iput(). When !SB_ACTIVE, iput() calls write_inode_now() which acquires s_writepages_rwsem, creating a circular lock dependency: s_writepages_rwsem --> jbd2_handle --> xattr_sem --> s_writepages_rwsem This can be triggered via: ext4_process_orphan() -> ext4_truncate() -> ext4_mark_inode_dirty() -> ext4_try_to_expand_extra_isize() or: ext4_evict_inode() -> ext4_mark_inode_dirty() -> ext4_try_to_expand_extra_isize() Skip expansion when !SB_ACTIVE. This is a minor loss of functionality (extra isize won't grow for these inodes during mount), which e2fsck can resolve later if needed.

Announced Source revision 1
Original source ↗

CVE-2026-93268

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-93268

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "c8585c6fcaf2011de54c3592e80a634a2b9e1a7f",
        "lessThan": "41897f1bcf4ace5f1f28d0be784b6f4f0e929641",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c8585c6fcaf2011de54c3592e80a634a2b9e1a7f",
        "lessThan": "9c3469377b1d8caba6bec6ef3c460810bbfb02cc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c8585c6fcaf2011de54c3592e80a634a2b9e1a7f",
        "lessThan": "1dd4882dbdc8bfdf2182fa388883c143fac0902a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c8585c6fcaf2011de54c3592e80a634a2b9e1a7f",
        "lessThan": "7ba09330d9ea6e996228316719eae812d7e04983",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c8585c6fcaf2011de54c3592e80a634a2b9e1a7f",
        "lessThan": "c5e6434cc55f30220b228be237bb666351f9f4dd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c8585c6fcaf2011de54c3592e80a634a2b9e1a7f",
        "lessThan": "7ace189b9ea79cf78df9c32b940ce12735f9459a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c8585c6fcaf2011de54c3592e80a634a2b9e1a7f",
        "lessThan": "2fb8ff81659a57c42bb7b49e8339a2be2a318ef8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c8585c6fcaf2011de54c3592e80a634a2b9e1a7f",
        "lessThan": "7461c60b9c6a839b13ad4c3490681a0cf5aa0637",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/ext4/inode.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.7"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.7",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/ext4/inode.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-93268

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#37961 · Revision 1
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Publisher date
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