CVE-2026-93269 (GCVE-0-2026-93269)
Vulnerability from cvelistv5
Published
2026-09-24 15:52
Modified
2026-10-19 09:08
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: cb85f4d23f794e24127f3e562cb3b54b0803f456
Version: cb85f4d23f794e24127f3e562cb3b54b0803f456
Version: cb85f4d23f794e24127f3e562cb3b54b0803f456
Version: cb85f4d23f794e24127f3e562cb3b54b0803f456
Version: cb85f4d23f794e24127f3e562cb3b54b0803f456
Version: eb799e163dc2bc1ea0a4820b66f79d32a5e907df
Version: bcc1eab71a67c46b9e24544ac7923f44444174ce
Version: 8cf20fb73e73a4c4df0328b5297842c5ef34fdd9
Version: e5d25003d059649e18a249635ed5ca7a7b1de5ad
Version: 69f8a7991fd93c49096ddd11574db3e7df238b7b
Version: 4.9.215   ≤
Version: 4.14.172   ≤
Version: 4.19.107   ≤
Version: 5.4.23   ≤
Version: 5.5.7   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/migrate.c"
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          "product": "Linux",
          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix circular lock dependency in ext4_ext_migrate\n\nMove iput(tmp_inode) after ext4_writepages_up_write() to avoid a\ncircular lock dependency between s_writepages_rwsem and sb_internal\n(freeze protection).\n\nThe deadlock scenario:\n\n  CPU0 (EXT4_IOC_MIGRATE)        CPU1 (orphan cleanup during mount)\n  ----                           ----\n  ext4_ext_migrate()\n    ext4_writepages_down_write()\n      s_writepages_rwsem (write)\n                                 ext4_evict_inode()\n                                   sb_start_intwrite()   [sb_internal]\n                                   ...\n                                     ext4_writepages()\n                                       s_writepages_rwsem (read) [BLOCKED]\n    iput(tmp_inode)\n      ext4_evict_inode()\n        sb_start_intwrite()         [BLOCKED]\n\nThe tmp_inode is a temporary inode with nlink=0 created solely for\nbuilding the extent tree.  Its eviction does not require\ns_writepages_rwsem protection, so deferring iput() until after\nreleasing the rwsem is safe."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:08:23.592Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/452950461241dfed8b1d32e94b227db38c99c5af"
        },
        {
          "url": "https://git.kernel.org/stable/c/ada23457d4748d6e9c36c6f871fc29a6f558c48c"
        },
        {
          "url": "https://git.kernel.org/stable/c/e4223231b6860141813637a6413c2371ae4d6fa8"
        },
        {
          "url": "https://git.kernel.org/stable/c/32f7ab52875ec7f800ca67e7176e5743a84baddf"
        },
        {
          "url": "https://git.kernel.org/stable/c/a897682793eba5de51ee6f3152760374afa629cf"
        }
      ],
      "title": "ext4: fix circular lock dependency in ext4_ext_migrate",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93269",
    "datePublished": "2026-09-24T15:52:09.047Z",
    "dateReserved": "2026-09-17T16:02:15.097Z",
    "dateUpdated": "2026-10-19T09:08:23.592Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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