Riskcovery

CVE-2026-93269

ext4: fix circular lock dependency in ext4_ext_migrate

State
Published
Severity
Not scored
Published
Sep 24, 2026
Updated
Oct 30, 2026
Reserved
Sep 17, 2026

Read the record on cve.org

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • cb85f4d23f794e24127f3e562cb3b54b0803f456 to before f204882d5eaca09f7848f081c9c9b5bbf2234895Affected
  • cb85f4d23f794e24127f3e562cb3b54b0803f456 to before 452950461241dfed8b1d32e94b227db38c99c5afAffected
  • cb85f4d23f794e24127f3e562cb3b54b0803f456 to before ada23457d4748d6e9c36c6f871fc29a6f558c48cAffected
  • cb85f4d23f794e24127f3e562cb3b54b0803f456 to before e4223231b6860141813637a6413c2371ae4d6fa8Affected
  • cb85f4d23f794e24127f3e562cb3b54b0803f456 to before 32f7ab52875ec7f800ca67e7176e5743a84baddfAffected
  • cb85f4d23f794e24127f3e562cb3b54b0803f456 to before a897682793eba5de51ee6f3152760374afa629cfAffected
  • eb799e163dc2bc1ea0a4820b66f79d32a5e907dfAffected
  • bcc1eab71a67c46b9e24544ac7923f44444174ceAffected
  • 8cf20fb73e73a4c4df0328b5297842c5ef34fdd9Affected
  • e5d25003d059649e18a249635ed5ca7a7b1de5adAffected
  • 69f8a7991fd93c49096ddd11574db3e7df238b7bAffected
  • 4.9.215 to before 4.10Affected
  • 4.14.172 to before 4.15Affected
  • 4.19.107 to before 4.20Affected
  • 5.4.23 to before 5.5Affected
  • 5.5.7 to before 5.6Affected
LinuxLinux
  • 5.6Affected
  • before 5.6Not affected
  • 6.1.191 through 6.1.*Not affected
  • 6.6.157 through 6.6.*Not affected
  • 6.12.110 through 6.12.*Not affected
  • 6.18.52 through 6.18.*Not affected
  • 7.2.6 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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