CVE-2026-93269

CVE-2026-93269: vulnerability in Linux

ext4: fix circular lock dependency in ext4_ext_migrate

Published

3Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackepss 0.2%
exploitation probability
0.2%top 92% of all CVEs
observed exploitation
nono source reports it
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.
Affected products
Linux · Linux
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References
https://git.kernel.org/stable/c/32f7ab52875ec7f800ca67e7176e5743a84baddfhttps://git.kernel.org/stable/c/452950461241dfed8b1d32e94b227db38c99c5afhttps://git.kernel.org/stable/c/a897682793eba5de51ee6f3152760374afa629cfhttps://git.kernel.org/stable/c/ada23457d4748d6e9c36c6f871fc29a6f558c48chttps://git.kernel.org/stable/c/e4223231b6860141813637a6413c2371ae4d6fa8