Vulnerability-Lookup

FKIE_CVE-2026-90204

Vulnerability from fkie_nvd - Published: 2026-09-17 17:17 - Updated: 2026-09-18 18:17

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: ocfs2: validate DIO orphan slot during inode read [BUG] A corrupted append-DIO dinode (high byte at offset 0xa1 corrupted from 0 to 1) can carry an i_dio_orphaned_slot outside the mounted filesystem slot range and trigger a use-after-free error: BUG: KASAN: slab-use-after-free in ocfs2_get_system_file_inode+0x780/0x820 fs/ocfs2/sysfile.c:102 Read of size 8 at addr ffff88800b767c00 by task kworker/u8:3/85 Call Trace: ... ocfs2_get_system_file_inode+0x780/0x820 fs/ocfs2/sysfile.c:102 ocfs2_wipe_inode+0x292/0xf70 fs/ocfs2/inode.c:840 ocfs2_delete_inode fs/ocfs2/inode.c:1155 [inline] ocfs2_evict_inode+0x6c9/0x1170 fs/ocfs2/inode.c:1295 evict+0x38e/0x8f0 fs/inode.c:810 iput_final fs/inode.c:1914 [inline] iput fs/inode.c:1966 [inline] iput+0x55b/0x8b0 fs/inode.c:1926 ocfs2_recover_orphans+0x610/0xe40 fs/ocfs2/journal.c:2374 ocfs2_complete_recovery+0x5af/0xd00 fs/ocfs2/journal.c:1373 ... [CAUSE] ocfs2_del_inode_from_orphan() uses i_dio_orphaned_slot to index the slot-local system inode cache. The dinode validator does not check this active slot, so an out-of-range value produces an invalid cache entry pointer that is dereferenced as an inode pointer. [FIX] Reject an active i_dio_orphaned_slot outside the slot range during dinode validation, before DIO orphan recovery can consume it.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/418e0ae42fa769d354b15e62c01a00413024755b
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/bb88131c9831075b8dc08cdd375743e5d44c7ca2
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e35fa6eb4d2a39f8049f62361a4b44930882b5f8

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ocfs2/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e35fa6eb4d2a39f8049f62361a4b44930882b5f8",
              "status": "affected",
              "version": "06ee5c75b57564435933fc0ffa72dc18a2fda0e7",
              "versionType": "git"
            },
            {
              "lessThan": "418e0ae42fa769d354b15e62c01a00413024755b",
              "status": "affected",
              "version": "06ee5c75b57564435933fc0ffa72dc18a2fda0e7",
              "versionType": "git"
            },
            {
              "lessThan": "bb88131c9831075b8dc08cdd375743e5d44c7ca2",
              "status": "affected",
              "version": "06ee5c75b57564435933fc0ffa72dc18a2fda0e7",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ocfs2/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.0"
            },
            {
              "lessThan": "4.0",
              "status": "unaffected",
              "version": "0",
              "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-rc1",
              "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\nocfs2: validate DIO orphan slot during inode read\n\n[BUG]\nA corrupted append-DIO dinode (high byte at offset 0xa1\ncorrupted from 0 to 1) can carry an i_dio_orphaned_slot\noutside the mounted filesystem slot range and trigger a\nuse-after-free error:\n\nBUG: KASAN: slab-use-after-free in ocfs2_get_system_file_inode+0x780/0x820 fs/ocfs2/sysfile.c:102\nRead of size 8 at addr ffff88800b767c00 by task kworker/u8:3/85\nCall Trace:\n ...\n ocfs2_get_system_file_inode+0x780/0x820 fs/ocfs2/sysfile.c:102\n ocfs2_wipe_inode+0x292/0xf70 fs/ocfs2/inode.c:840\n ocfs2_delete_inode fs/ocfs2/inode.c:1155 [inline]\n ocfs2_evict_inode+0x6c9/0x1170 fs/ocfs2/inode.c:1295\n evict+0x38e/0x8f0 fs/inode.c:810\n iput_final fs/inode.c:1914 [inline]\n iput fs/inode.c:1966 [inline]\n iput+0x55b/0x8b0 fs/inode.c:1926\n ocfs2_recover_orphans+0x610/0xe40 fs/ocfs2/journal.c:2374\n ocfs2_complete_recovery+0x5af/0xd00 fs/ocfs2/journal.c:1373\n ...\n\n[CAUSE]\nocfs2_del_inode_from_orphan() uses i_dio_orphaned_slot to index the\nslot-local system inode cache. The dinode validator does not check\nthis active slot, so an out-of-range value produces an invalid cache\nentry pointer that is dereferenced as an inode pointer.\n\n[FIX]\nReject an active i_dio_orphaned_slot outside the slot range during\ndinode validation, before DIO orphan recovery can consume it."
    }
  ],
  "id": "CVE-2026-90204",
  "lastModified": "2026-09-18T18:17:46.287",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-17T17:17:15.460",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/418e0ae42fa769d354b15e62c01a00413024755b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bb88131c9831075b8dc08cdd375743e5d44c7ca2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e35fa6eb4d2a39f8049f62361a4b44930882b5f8"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-90204 (GCVE-0-2026-90204)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:07 – Updated: 2026-09-18 17:53

Title

ocfs2: validate DIO orphan slot during inode read

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Assigner

Linux mitre root Scorecard

References

3 references

URL	Tags
https://git.kernel.org/stable/c/e35fa6eb4d2a39f80…
https://git.kernel.org/stable/c/418e0ae42fa769d35…
https://git.kernel.org/stable/c/bb88131c9831075b8…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 06ee5c75b57564435933fc0ffa72dc18a2fda0e7 , < e35fa6eb4d2a39f8049f62361a4b44930882b5f8 (git) Affected: 06ee5c75b57564435933fc0ffa72dc18a2fda0e7 , < 418e0ae42fa769d354b15e62c01a00413024755b (git) Affected: 06ee5c75b57564435933fc0ffa72dc18a2fda0e7 , < bb88131c9831075b8dc08cdd375743e5d44c7ca2 (git)
Linux	Linux	Affected: 4.0 Unaffected: 0 , < 4.0 (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ocfs2/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e35fa6eb4d2a39f8049f62361a4b44930882b5f8",
              "status": "affected",
              "version": "06ee5c75b57564435933fc0ffa72dc18a2fda0e7",
              "versionType": "git"
            },
            {
              "lessThan": "418e0ae42fa769d354b15e62c01a00413024755b",
              "status": "affected",
              "version": "06ee5c75b57564435933fc0ffa72dc18a2fda0e7",
              "versionType": "git"
            },
            {
              "lessThan": "bb88131c9831075b8dc08cdd375743e5d44c7ca2",
              "status": "affected",
              "version": "06ee5c75b57564435933fc0ffa72dc18a2fda0e7",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ocfs2/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.0"
            },
            {
              "lessThan": "4.0",
              "status": "unaffected",
              "version": "0",
              "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-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "4.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "4.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "4.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: validate DIO orphan slot during inode read\n\n[BUG]\nA corrupted append-DIO dinode (high byte at offset 0xa1\ncorrupted from 0 to 1) can carry an i_dio_orphaned_slot\noutside the mounted filesystem slot range and trigger a\nuse-after-free error:\n\nBUG: KASAN: slab-use-after-free in ocfs2_get_system_file_inode+0x780/0x820 fs/ocfs2/sysfile.c:102\nRead of size 8 at addr ffff88800b767c00 by task kworker/u8:3/85\nCall Trace:\n ...\n ocfs2_get_system_file_inode+0x780/0x820 fs/ocfs2/sysfile.c:102\n ocfs2_wipe_inode+0x292/0xf70 fs/ocfs2/inode.c:840\n ocfs2_delete_inode fs/ocfs2/inode.c:1155 [inline]\n ocfs2_evict_inode+0x6c9/0x1170 fs/ocfs2/inode.c:1295\n evict+0x38e/0x8f0 fs/inode.c:810\n iput_final fs/inode.c:1914 [inline]\n iput fs/inode.c:1966 [inline]\n iput+0x55b/0x8b0 fs/inode.c:1926\n ocfs2_recover_orphans+0x610/0xe40 fs/ocfs2/journal.c:2374\n ocfs2_complete_recovery+0x5af/0xd00 fs/ocfs2/journal.c:1373\n ...\n\n[CAUSE]\nocfs2_del_inode_from_orphan() uses i_dio_orphaned_slot to index the\nslot-local system inode cache. The dinode validator does not check\nthis active slot, so an out-of-range value produces an invalid cache\nentry pointer that is dereferenced as an inode pointer.\n\n[FIX]\nReject an active i_dio_orphaned_slot outside the slot range during\ndinode validation, before DIO orphan recovery can consume it."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bad i_dio_orphaned_slot is an on-disk ocfs2_dinode field (offset 0xa0) consumed by ocfs2_del_inode_from_orphan() after ocfs2_validate_inode_block() along ocfs2_fill_super\u2192ocfs2_complete_mount_recovery\u2192ocfs2_recover_orphans (or ocfs2_add_inode_to_orphan on append DIO). No network protocol carries this slot.\nAC:L - A dinode with OCFS2_DIO_ORPHANED_FL and i_dio_orphaned_slot \u003e= osb-\u003emax_slots (the reported 0xa1 0\u21921 flip yields slot 256) makes get_local_system_inode() index slot*NUM_LOCAL_SYSTEM_INODES past the kzalloc(max_slots*NUM_LOCAL_SYSTEM_INODES) cache and igrab the out-of-range pointer with no race.\nPR:N - ocfs2_fs_type lacks FS_USERNS_MOUNT, so mount_capable() requires init-namespace CAP_SYS_ADMIN. The higher-severity case is a crafted loop/LUN image whose recovery runs when an administrator mounts it, so the attacker needs no account or capability on the victim.\nUI:R - The attacker-supplied ocfs2 image must be mounted via ocfs2_fill_super so ocfs2_complete_mount_recovery() can walk DIO orphan dirents and call ocfs2_del_inode_from_orphan() on the forged i_dio_orphaned_slot. That mount is the required victim action.\nS:U - igrab() of the out-of-range local_system_inodes[] pointer and later ocfs2_inode_lock() stay inside the kernel that mounted the volume; this is not a KVM/Xen guest-to-host escape or IOMMU/DMA bypass.\nC:H - get_local_system_inode() reads an 8-byte inode pointer past the slot-local cache, then igrab() and ocfs2_inode_lock() treat it as a live inode. KASAN reported slab-use-after-free in ocfs2_get_system_file_inode(); a UAF inode object yields an arbitrary kernel read.\nI:H - After igrab() on the OOB/UAF pointer, ocfs2_del_inode_from_orphan() takes inode_lock and ocfs2_inode_lock on that object and journals orphan-dir mutations through it, which is a type-confused write/control-flow primitive on a freed or adjacent heap object.\nA:H - igrab() on a garbage or I_FREEING pointer hits BUG_ON(!inode) in ocfs2_get_system_file_inode() or the KASAN UAF oops shown on the ocfs2_recover_orphans mount-recovery path, which is a kernel crash."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-18T17:53:42.767Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e35fa6eb4d2a39f8049f62361a4b44930882b5f8"
        },
        {
          "url": "https://git.kernel.org/stable/c/418e0ae42fa769d354b15e62c01a00413024755b"
        },
        {
          "url": "https://git.kernel.org/stable/c/bb88131c9831075b8dc08cdd375743e5d44c7ca2"
        }
      ],
      "title": "ocfs2: validate DIO orphan slot during inode read",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90204",
    "datePublished": "2026-09-17T16:07:20.845Z",
    "dateReserved": "2026-09-11T19:38:34.792Z",
    "dateUpdated": "2026-09-18T17:53:42.767Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
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Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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FKIE_CVE-2026-90204

CVE-2026-90204 (GCVE-0-2026-90204)

Tags

Sightings

Nomenclature

Related by attack behaviour