FKIE_CVE-2026-93268

Vulnerability from fkie_nvd - Published: 2026-09-24 16:17 - Updated: 2026-10-19 10:17
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1dd4882dbdc8bfdf2182fa388883c143fac0902a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2fb8ff81659a57c42bb7b49e8339a2be2a318ef8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/41897f1bcf4ace5f1f28d0be784b6f4f0e929641
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7461c60b9c6a839b13ad4c3490681a0cf5aa0637
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7ace189b9ea79cf78df9c32b940ce12735f9459a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7ba09330d9ea6e996228316719eae812d7e04983
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9c3469377b1d8caba6bec6ef3c460810bbfb02cc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c5e6434cc55f30220b228be237bb666351f9f4dd
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "41897f1bcf4ace5f1f28d0be784b6f4f0e929641",
              "status": "affected",
              "version": "c8585c6fcaf2011de54c3592e80a634a2b9e1a7f",
              "versionType": "git"
            },
            {
              "lessThan": "9c3469377b1d8caba6bec6ef3c460810bbfb02cc",
              "status": "affected",
              "version": "c8585c6fcaf2011de54c3592e80a634a2b9e1a7f",
              "versionType": "git"
            },
            {
              "lessThan": "1dd4882dbdc8bfdf2182fa388883c143fac0902a",
              "status": "affected",
              "version": "c8585c6fcaf2011de54c3592e80a634a2b9e1a7f",
              "versionType": "git"
            },
            {
              "lessThan": "7ba09330d9ea6e996228316719eae812d7e04983",
              "status": "affected",
              "version": "c8585c6fcaf2011de54c3592e80a634a2b9e1a7f",
              "versionType": "git"
            },
            {
              "lessThan": "c5e6434cc55f30220b228be237bb666351f9f4dd",
              "status": "affected",
              "version": "c8585c6fcaf2011de54c3592e80a634a2b9e1a7f",
              "versionType": "git"
            },
            {
              "lessThan": "7ace189b9ea79cf78df9c32b940ce12735f9459a",
              "status": "affected",
              "version": "c8585c6fcaf2011de54c3592e80a634a2b9e1a7f",
              "versionType": "git"
            },
            {
              "lessThan": "2fb8ff81659a57c42bb7b49e8339a2be2a318ef8",
              "status": "affected",
              "version": "c8585c6fcaf2011de54c3592e80a634a2b9e1a7f",
              "versionType": "git"
            },
            {
              "lessThan": "7461c60b9c6a839b13ad4c3490681a0cf5aa0637",
              "status": "affected",
              "version": "c8585c6fcaf2011de54c3592e80a634a2b9e1a7f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.7"
            },
            {
              "lessThan": "4.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-93268",
  "lastModified": "2026-10-19T10:17:18.230",
  "metrics": {},
  "published": "2026-09-24T16:17:23.730",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1dd4882dbdc8bfdf2182fa388883c143fac0902a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2fb8ff81659a57c42bb7b49e8339a2be2a318ef8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/41897f1bcf4ace5f1f28d0be784b6f4f0e929641"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7461c60b9c6a839b13ad4c3490681a0cf5aa0637"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7ace189b9ea79cf78df9c32b940ce12735f9459a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7ba09330d9ea6e996228316719eae812d7e04983"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9c3469377b1d8caba6bec6ef3c460810bbfb02cc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c5e6434cc55f30220b228be237bb666351f9f4dd"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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