CVE-2026-93269 (GCVE-0-2026-93269)

Vulnerability from cvelistv5 – Published: 2026-09-24 15:52 – Updated: 2026-09-24 15:52
VLAI
Title
ext4: fix circular lock dependency in ext4_ext_migrate
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cb85f4d23f794e24127f3e562cb3b54b0803f456 , < 452950461241dfed8b1d32e94b227db38c99c5af (git)
Affected: cb85f4d23f794e24127f3e562cb3b54b0803f456 , < ada23457d4748d6e9c36c6f871fc29a6f558c48c (git)
Affected: cb85f4d23f794e24127f3e562cb3b54b0803f456 , < e4223231b6860141813637a6413c2371ae4d6fa8 (git)
Affected: cb85f4d23f794e24127f3e562cb3b54b0803f456 , < 32f7ab52875ec7f800ca67e7176e5743a84baddf (git)
Affected: cb85f4d23f794e24127f3e562cb3b54b0803f456 , < a897682793eba5de51ee6f3152760374afa629cf (git)
Affected: eb799e163dc2bc1ea0a4820b66f79d32a5e907df (git)
Affected: bcc1eab71a67c46b9e24544ac7923f44444174ce (git)
Affected: 8cf20fb73e73a4c4df0328b5297842c5ef34fdd9 (git)
Affected: e5d25003d059649e18a249635ed5ca7a7b1de5ad (git)
Affected: 69f8a7991fd93c49096ddd11574db3e7df238b7b (git)
Affected: 4.9.215 , < 4.10 (semver)
Affected: 4.14.172 , < 4.15 (semver)
Affected: 4.19.107 , < 4.20 (semver)
Affected: 5.4.23 , < 5.5 (semver)
Affected: 5.5.7 , < 5.6 (semver)
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Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "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."
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        {
          "url": "https://git.kernel.org/stable/c/a897682793eba5de51ee6f3152760374afa629cf"
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    "cveId": "CVE-2026-93269",
    "datePublished": "2026-09-24T15:52:09.047Z",
    "dateReserved": "2026-09-17T16:02:15.097Z",
    "dateUpdated": "2026-09-24T15:52:09.047Z",
    "state": "PUBLISHED"
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            "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."
          }
        ],
        "id": "CVE-2026-93269",
        "lastModified": "2026-09-24T16:17:23.873",
        "metrics": {},
        "published": "2026-09-24T16:17:23.873",
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        "vulnStatus": "Received"
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    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-09-24T23:48:42Z",
      "cve": "CVE-2026-93269",
      "id": "CVE-2026-93269",
      "initial_release_date": "2026-09-24T23:48:42Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-93269",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-93269.json",
      "version": "2"
    }
  }
}



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