FKIE_CVE-2023-53149

Vulnerability from fkie_nvd - Published: 2025-09-15 14:15 - Updated: 2025-11-25 17:03
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: avoid deadlock in fs reclaim with page writeback Ext4 has a filesystem wide lock protecting ext4_writepages() calls to avoid races with switching of journalled data flag or inode format. This lock can however cause a deadlock like: CPU0 CPU1 ext4_writepages() percpu_down_read(sbi->s_writepages_rwsem); ext4_change_inode_journal_flag() percpu_down_write(sbi->s_writepages_rwsem); - blocks, all readers block from now on ext4_do_writepages() ext4_init_io_end() kmem_cache_zalloc(io_end_cachep, GFP_KERNEL) fs_reclaim frees dentry... dentry_unlink_inode() iput() - last ref => iput_final() - inode dirty => write_inode_now()... ext4_writepages() tries to acquire sbi->s_writepages_rwsem and blocks forever Make sure we cannot recurse into filesystem reclaim from writeback code to avoid the deadlock.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/00d873c17e29cc32d90ca852b82685f1673acaa5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2ec97dc90df40c50e509809dc9a198638a7e18b6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4b4340bf04ce9a52061f15000ecedd126abc093cPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.4
To clipboard 

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: avoid deadlock in fs reclaim with page writeback\n\nExt4 has a filesystem wide lock protecting ext4_writepages() calls to\navoid races with switching of journalled data flag or inode format. This\nlock can however cause a deadlock like:\n\nCPU0                            CPU1\n\next4_writepages()\n  percpu_down_read(sbi-\u003es_writepages_rwsem);\n                                ext4_change_inode_journal_flag()\n                                  percpu_down_write(sbi-\u003es_writepages_rwsem);\n                                    - blocks, all readers block from now on\n  ext4_do_writepages()\n    ext4_init_io_end()\n      kmem_cache_zalloc(io_end_cachep, GFP_KERNEL)\n        fs_reclaim frees dentry...\n          dentry_unlink_inode()\n            iput() - last ref =\u003e\n              iput_final() - inode dirty =\u003e\n                write_inode_now()...\n                  ext4_writepages() tries to acquire sbi-\u003es_writepages_rwsem\n                    and blocks forever\n\nMake sure we cannot recurse into filesystem reclaim from writeback code\nto avoid the deadlock."
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  "id": "CVE-2023-53149",
  "lastModified": "2025-11-25T17:03:43.000",
  "metrics": {
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2025-09-15T14:15:37.393",
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  "vulnStatus": "Analyzed",
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