CVE-2026-93268
ext4: skip extra isize expansion during mount to prevent deadlock
Description
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.
INFO
Published Date :
Sept. 24, 2026, 4:17 p.m.
Last Modified :
Sept. 24, 2026, 4:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Apply the Linux kernel patch for ext4.
- Update the Linux kernel to a fixed version.
- Run e2fsck to resolve potential issues later.
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Common Attack Pattern Enumeration and Classification (CAPEC)
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weaknesses.
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Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 24, 2026
Action Type Old Value New Value Added Description 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. Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/93xxx/CVE-2026-93268.json">CVE-2026-93268</a> Added Reference https://git.kernel.org/stable/c/1dd4882dbdc8bfdf2182fa388883c143fac0902a Added Reference https://git.kernel.org/stable/c/2fb8ff81659a57c42bb7b49e8339a2be2a318ef8 Added Reference https://git.kernel.org/stable/c/41897f1bcf4ace5f1f28d0be784b6f4f0e929641 Added Reference https://git.kernel.org/stable/c/7461c60b9c6a839b13ad4c3490681a0cf5aa0637 Added Reference https://git.kernel.org/stable/c/7ace189b9ea79cf78df9c32b940ce12735f9459a Added Reference https://git.kernel.org/stable/c/7ba09330d9ea6e996228316719eae812d7e04983 Added Reference https://git.kernel.org/stable/c/9c3469377b1d8caba6bec6ef3c460810bbfb02cc Added Reference https://git.kernel.org/stable/c/c5e6434cc55f30220b228be237bb666351f9f4dd