ext4: fix circular lock dependency in ext4_ext_migrate
Summary
| CVE | CVE-2026-93269 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-24 16:17:23 UTC |
| Updated | 2026-10-30 13:21:01 UTC |
| 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. |
Risk And Classification
EPSS: 0.001970000 probability, percentile 0.094450000 (date 2026-11-01)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected cb85f4d23f794e24127f3e562cb3b54b0803f456 f204882d5eaca09f7848f081c9c9b5bbf2234895 git | Not specified |
| CNA | Linux | Linux | affected cb85f4d23f794e24127f3e562cb3b54b0803f456 452950461241dfed8b1d32e94b227db38c99c5af git | Not specified |
| CNA | Linux | Linux | affected cb85f4d23f794e24127f3e562cb3b54b0803f456 ada23457d4748d6e9c36c6f871fc29a6f558c48c git | Not specified |
| CNA | Linux | Linux | affected cb85f4d23f794e24127f3e562cb3b54b0803f456 e4223231b6860141813637a6413c2371ae4d6fa8 git | Not specified |
| CNA | Linux | Linux | affected cb85f4d23f794e24127f3e562cb3b54b0803f456 32f7ab52875ec7f800ca67e7176e5743a84baddf git | Not specified |
| CNA | Linux | Linux | affected cb85f4d23f794e24127f3e562cb3b54b0803f456 a897682793eba5de51ee6f3152760374afa629cf git | Not specified |
| CNA | Linux | Linux | affected eb799e163dc2bc1ea0a4820b66f79d32a5e907df git | Not specified |
| CNA | Linux | Linux | affected bcc1eab71a67c46b9e24544ac7923f44444174ce git | Not specified |
| CNA | Linux | Linux | affected 8cf20fb73e73a4c4df0328b5297842c5ef34fdd9 git | Not specified |
| CNA | Linux | Linux | affected e5d25003d059649e18a249635ed5ca7a7b1de5ad git | Not specified |
| CNA | Linux | Linux | affected 69f8a7991fd93c49096ddd11574db3e7df238b7b git | Not specified |
| CNA | Linux | Linux | affected 4.9.215 4.10 semver | Not specified |
| CNA | Linux | Linux | affected 4.14.172 4.15 semver | Not specified |
| CNA | Linux | Linux | affected 4.19.107 4.20 semver | Not specified |
| CNA | Linux | Linux | affected 5.4.23 5.5 semver | Not specified |
| CNA | Linux | Linux | affected 5.5.7 5.6 semver | Not specified |
| CNA | Linux | Linux | affected 5.6 | Not specified |
| CNA | Linux | Linux | unaffected 5.6 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.191 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.157 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.110 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.52 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2.6 7.2.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.3 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/e4223231b6860141813637a6413c2371ae4d6fa8 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/452950461241dfed8b1d32e94b227db38c99c5af | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/f204882d5eaca09f7848f081c9c9b5bbf2234895 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/32f7ab52875ec7f800ca67e7176e5743a84baddf | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/ada23457d4748d6e9c36c6f871fc29a6f558c48c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a897682793eba5de51ee6f3152760374afa629cf | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.