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CVE-2026-93269

ext4: fix circular lock dependency in ext4_ext_migrate

Published: Sep 24, 2026Updated: Sep 24, 2026 Sources: CVE List
N/ACVSS
NVD MITRE
EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: fix circular lock dependency in ext4_ext_migrate Move iput(tmp_inode) after ext4_writepages_up_write() to avoid a circular lock dependency between s_writepages_rwsem and sb_internal (freeze protection). The deadlock scenario: CPU0 (EXT4_IOC_MIGRATE) CPU1 (orphan cleanup during mount) ---- ---- ext4_ext_migrate() ext4_writepages_down_write() s_writepages_rwsem (write) ext4_evict_inode() sb_start_intwrite() [sb_internal] ... ext4_writepages() s_writepages_rwsem (read) [BLOCKED] iput(tmp_inode) ext4_evict_inode() sb_start_intwrite() [BLOCKED] The tmp_inode is a temporary inode with nlink=0 created solely for building the extent tree. Its eviction does not require s_writepages_rwsem protection, so deferring iput() until after releasing the rwsem is safe.

No summary for this CVE yet.

Affected Products

Linux
oss-projectaka the linux kernel
LinuxOn-premOS
Operating Systems / linux-distro

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://git.kernel.org/stable/c/452950461241dfed8b1d32e94b227db38c99c5af
git.kernel.org
https://git.kernel.org/stable/c/ada23457d4748d6e9c36c6f871fc29a6f558c48c
git.kernel.org
https://git.kernel.org/stable/c/e4223231b6860141813637a6413c2371ae4d6fa8
git.kernel.org
and 2 more references View all →

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