CVE-2026-93268 (GCVE-0-2026-93268)
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: skip extra isize expansion during mount to prevent deadlock ext4_try_to_expand_extra_isize() is called from __ext4_mark_inode_dirty() while holding an active jbd2 handle. During mount (!SB_ACTIVE), the expand path may move xattrs to external blocks and release ea_inodes via iput(). When !SB_ACTIVE, iput() calls write_inode_now() which acquires s_writepages_rwsem, creating a circular lock dependency: s_writepages_rwsem --> jbd2_handle --> xattr_sem --> s_writepages_rwsem This can be triggered via: ext4_process_orphan() -> ext4_truncate() -> ext4_mark_inode_dirty() -> ext4_try_to_expand_extra_isize() or: ext4_evict_inode() -> ext4_mark_inode_dirty() -> ext4_try_to_expand_extra_isize() Skip expansion when !SB_ACTIVE. This is a minor loss of functionality (extra isize won't grow for these inodes during mount), which e2fsck can resolve later if needed.
References
Impacted products
Vendor Product Version
Linux Linux Version: c8585c6fcaf2011de54c3592e80a634a2b9e1a7f
Version: c8585c6fcaf2011de54c3592e80a634a2b9e1a7f
Version: c8585c6fcaf2011de54c3592e80a634a2b9e1a7f
Version: c8585c6fcaf2011de54c3592e80a634a2b9e1a7f
Version: c8585c6fcaf2011de54c3592e80a634a2b9e1a7f
Version: c8585c6fcaf2011de54c3592e80a634a2b9e1a7f
Version: c8585c6fcaf2011de54c3592e80a634a2b9e1a7f
Version: c8585c6fcaf2011de54c3592e80a634a2b9e1a7f
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/inode.c"
          ],
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "4.7"
            },
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              "version": "0",
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              "status": "unaffected",
              "version": "5.15.221",
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: skip extra isize expansion during mount to prevent deadlock\n\next4_try_to_expand_extra_isize() is called from __ext4_mark_inode_dirty()\nwhile holding an active jbd2 handle.  During mount (!SB_ACTIVE), the\nexpand path may move xattrs to external blocks and release ea_inodes via\niput().  When !SB_ACTIVE, iput() calls write_inode_now() which acquires\ns_writepages_rwsem, creating a circular lock dependency:\n\n  s_writepages_rwsem --\u003e jbd2_handle --\u003e xattr_sem --\u003e s_writepages_rwsem\n\nThis can be triggered via:\n\n  ext4_process_orphan() -\u003e ext4_truncate() -\u003e ext4_mark_inode_dirty()\n    -\u003e ext4_try_to_expand_extra_isize()\n\nor:\n\n  ext4_evict_inode() -\u003e ext4_mark_inode_dirty()\n    -\u003e ext4_try_to_expand_extra_isize()\n\nSkip expansion when !SB_ACTIVE.  This is a minor loss of functionality\n(extra isize won\u0027t grow for these inodes during mount), which e2fsck\ncan resolve later if needed."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:08:22.372Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/41897f1bcf4ace5f1f28d0be784b6f4f0e929641"
        },
        {
          "url": "https://git.kernel.org/stable/c/9c3469377b1d8caba6bec6ef3c460810bbfb02cc"
        },
        {
          "url": "https://git.kernel.org/stable/c/1dd4882dbdc8bfdf2182fa388883c143fac0902a"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ba09330d9ea6e996228316719eae812d7e04983"
        },
        {
          "url": "https://git.kernel.org/stable/c/c5e6434cc55f30220b228be237bb666351f9f4dd"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ace189b9ea79cf78df9c32b940ce12735f9459a"
        },
        {
          "url": "https://git.kernel.org/stable/c/2fb8ff81659a57c42bb7b49e8339a2be2a318ef8"
        },
        {
          "url": "https://git.kernel.org/stable/c/7461c60b9c6a839b13ad4c3490681a0cf5aa0637"
        }
      ],
      "title": "ext4: skip extra isize expansion during mount to prevent deadlock",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93268",
    "datePublished": "2026-09-24T15:52:07.310Z",
    "dateReserved": "2026-09-17T16:02:15.097Z",
    "dateUpdated": "2026-10-19T09:08:22.372Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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