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CVE-2026-93268

Unknown

Last modified

CVE-2026-93268 is a vulnerability of currently unknown severity. 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().

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= c8585c6fcaf2011de54c3592e80a634a2b9e1a7f, < 41897f1bcf4ace5f1f28d0be784b6f4f0e929641; >= c8585c6fcaf2011de54c3592e80a634a2b9e1a7f, < 9c3469377b1d8caba6bec6ef3c460810bbfb02cc; >= c8585c6fcaf2011de54c3592e80a634a2b9e1a7f, < 1dd4882dbdc8bfdf2182fa388883c143fac0902a; >= c8585c6fcaf2011de54c3592e80a634a2b9e1a7f, < 7ba09330d9ea6e996228316719eae812d7e04983; >= c8585c6fcaf2011de54c3592e80a634a2b9e1a7f, < c5e6434cc55f30220b228be237bb666351f9f4dd; >= c8585c6fcaf2011de54c3592e80a634a2b9e1a7f, < 7ace189b9ea79cf78df9c32b940ce12735f9459a; >= c8585c6fcaf2011de54c3592e80a634a2b9e1a7f, < 2fb8ff81659a57c42bb7b49e8339a2be2a318ef8; >= c8585c6fcaf2011de54c3592e80a634a2b9e1a7f, < 7461c60b9c6a839b13ad4c3490681a0cf5aa0637
LinuxLinux4.7

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-93268?
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.
How severe is CVE-2026-93268?
Severity scoring for CVE-2026-93268 is pending analysis.
How do I fix CVE-2026-93268?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST