CVE-2026-93268 (GCVE-0-2026-93268)

Vulnerability from cvelistv5 – Published: 2026-09-24 15:52 – Updated: 2026-09-24 15:52
VLAI
Title
ext4: skip extra isize expansion during mount to prevent deadlock
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c8585c6fcaf2011de54c3592e80a634a2b9e1a7f , < 41897f1bcf4ace5f1f28d0be784b6f4f0e929641 (git)
Affected: c8585c6fcaf2011de54c3592e80a634a2b9e1a7f , < 9c3469377b1d8caba6bec6ef3c460810bbfb02cc (git)
Affected: c8585c6fcaf2011de54c3592e80a634a2b9e1a7f , < 1dd4882dbdc8bfdf2182fa388883c143fac0902a (git)
Affected: c8585c6fcaf2011de54c3592e80a634a2b9e1a7f , < 7ba09330d9ea6e996228316719eae812d7e04983 (git)
Affected: c8585c6fcaf2011de54c3592e80a634a2b9e1a7f , < c5e6434cc55f30220b228be237bb666351f9f4dd (git)
Affected: c8585c6fcaf2011de54c3592e80a634a2b9e1a7f , < 7ace189b9ea79cf78df9c32b940ce12735f9459a (git)
Affected: c8585c6fcaf2011de54c3592e80a634a2b9e1a7f , < 2fb8ff81659a57c42bb7b49e8339a2be2a318ef8 (git)
Affected: c8585c6fcaf2011de54c3592e80a634a2b9e1a7f , < 7461c60b9c6a839b13ad4c3490681a0cf5aa0637 (git)
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Linux Linux Affected: 4.7
Unaffected: 0 , < 4.7 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: skip extra isize expansion during mount to prevent deadlock\n\next4_try_to_expand_extra_isize() is called from __ext4_mark_inode_dirty()\nwhile holding an active jbd2 handle.  During mount (!SB_ACTIVE), the\nexpand path may move xattrs to external blocks and release ea_inodes via\niput().  When !SB_ACTIVE, iput() calls write_inode_now() which acquires\ns_writepages_rwsem, creating a circular lock dependency:\n\n  s_writepages_rwsem --\u003e jbd2_handle --\u003e xattr_sem --\u003e s_writepages_rwsem\n\nThis can be triggered via:\n\n  ext4_process_orphan() -\u003e ext4_truncate() -\u003e ext4_mark_inode_dirty()\n    -\u003e ext4_try_to_expand_extra_isize()\n\nor:\n\n  ext4_evict_inode() -\u003e ext4_mark_inode_dirty()\n    -\u003e ext4_try_to_expand_extra_isize()\n\nSkip expansion when !SB_ACTIVE.  This is a minor loss of functionality\n(extra isize won\u0027t grow for these inodes during mount), which e2fsck\ncan resolve later if needed."
        }
      ],
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "dateReserved": "2026-09-17T16:02:15.097Z",
    "dateUpdated": "2026-09-24T15:52:07.310Z",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: skip extra isize expansion during mount to prevent deadlock\n\next4_try_to_expand_extra_isize() is called from __ext4_mark_inode_dirty()\nwhile holding an active jbd2 handle.  During mount (!SB_ACTIVE), the\nexpand path may move xattrs to external blocks and release ea_inodes via\niput().  When !SB_ACTIVE, iput() calls write_inode_now() which acquires\ns_writepages_rwsem, creating a circular lock dependency:\n\n  s_writepages_rwsem --\u003e jbd2_handle --\u003e xattr_sem --\u003e s_writepages_rwsem\n\nThis can be triggered via:\n\n  ext4_process_orphan() -\u003e ext4_truncate() -\u003e ext4_mark_inode_dirty()\n    -\u003e ext4_try_to_expand_extra_isize()\n\nor:\n\n  ext4_evict_inode() -\u003e ext4_mark_inode_dirty()\n    -\u003e ext4_try_to_expand_extra_isize()\n\nSkip expansion when !SB_ACTIVE.  This is a minor loss of functionality\n(extra isize won\u0027t grow for these inodes during mount), which e2fsck\ncan resolve later if needed."
          }
        ],
        "id": "CVE-2026-93268",
        "lastModified": "2026-09-24T16:17:23.730",
        "metrics": {},
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-09-24T23:48:44Z",
      "cve": "CVE-2026-93268",
      "id": "CVE-2026-93268",
      "initial_release_date": "2026-09-24T23:48:44Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-93268",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-93268.json",
      "version": "2"
    }
  }
}



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