Vulnerability-Lookup

FKIE_CVE-2023-53626

Vulnerability from fkie_nvd - Published: 2025-10-07 16:15 - Updated: 2026-08-04 10:19

Severity

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

Summary

In the Linux kernel, the following vulnerability has been resolved: ext4: fix possible double unlock when moving a directory

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/020166bc6669ca9fb267ebd96bd88c4fb64a5d46	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1c93c42c7bb23057bde8a0a2ab834927ff64d20c	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/43ce288ab5d7274a4a141d7f5e3ed2ab7b41f8a2	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/70e42feab2e20618ddd0cbfc4ab4b08628236ecd	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c16cbd8233d6c58fc488545393e49b5d55729990	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e71eb4dca41f0f36823724ced0406bb2dbdd5506	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	5.4.237
linux	linux_kernel	5.10.175
linux	linux_kernel	5.15.103
linux	linux_kernel	6.1.20
linux	linux_kernel	6.2.7
linux	linux_kernel	6.3
linux	linux_kernel	6.3

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/namei.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "8dac5a63cf79707b547ea3d425fead5f4482198f",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
            },
            {
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "b0bb13612292ca90fa4c2a7e425375649bc50d3e",
              "versionType": "git"
            },
            {
              "lessThan": "43ce288ab5d7274a4a141d7f5e3ed2ab7b41f8a2",
              "status": "affected",
              "version": "291cd19d107e197306869cb3237c1bba62d13182",
              "versionType": "git"
            },
            {
              "lessThan": "70e42feab2e20618ddd0cbfc4ab4b08628236ecd",
              "status": "affected",
              "version": "0813299c586b175d7edb25f56412c54b812d0379",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/namei.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "5.4.237",
              "versionType": "semver"
            },
            {
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              "status": "affected",
              "version": "5.10.175",
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            },
            {
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              "status": "affected",
              "version": "5.15.103",
              "versionType": "semver"
            },
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              "status": "affected",
              "version": "6.1.20",
              "versionType": "semver"
            },
            {
              "lessThan": "6.2.8",
              "status": "affected",
              "version": "6.2.7",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
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  "cveTags": [],
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix possible double unlock when moving a directory"
    }
  ],
  "id": "CVE-2023-53626",
  "lastModified": "2026-08-04T10:19:15.087",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2025-10-07T16:15:45.440",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/020166bc6669ca9fb267ebd96bd88c4fb64a5d46"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/1c93c42c7bb23057bde8a0a2ab834927ff64d20c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/43ce288ab5d7274a4a141d7f5e3ed2ab7b41f8a2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/70e42feab2e20618ddd0cbfc4ab4b08628236ecd"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/c16cbd8233d6c58fc488545393e49b5d55729990"
    },
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "url": "https://git.kernel.org/stable/c/e71eb4dca41f0f36823724ced0406bb2dbdd5506"
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  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-415"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2023-53626 (GCVE-0-2023-53626)

Vulnerability from cvelistv5 – Published: 2025-10-07 15:19 – Updated: 2026-08-05 09:15

Title

ext4: fix possible double unlock when moving a directory

Summary

In the Linux kernel, the following vulnerability has been resolved: ext4: fix possible double unlock when moving a directory

Severity

7.8 (High)


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

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/c16cbd8233d6c58fc…
https://git.kernel.org/stable/c/020166bc6669ca9fb…
https://git.kernel.org/stable/c/1c93c42c7bb23057b…
https://git.kernel.org/stable/c/e71eb4dca41f0f368…
https://git.kernel.org/stable/c/43ce288ab5d7274a4…
https://git.kernel.org/stable/c/70e42feab2e20618d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 8dac5a63cf79707b547ea3d425fead5f4482198f , < c16cbd8233d6c58fc488545393e49b5d55729990 (git) Affected: 0c440f14558bfacd22c6935ae1fd4b2a09e96b5d , < 020166bc6669ca9fb267ebd96bd88c4fb64a5d46 (git) Affected: c50fc503ee1b97f12c98e26afc39fdaebebcf04f , < 1c93c42c7bb23057bde8a0a2ab834927ff64d20c (git) Affected: b0bb13612292ca90fa4c2a7e425375649bc50d3e , < e71eb4dca41f0f36823724ced0406bb2dbdd5506 (git) Affected: 291cd19d107e197306869cb3237c1bba62d13182 , < 43ce288ab5d7274a4a141d7f5e3ed2ab7b41f8a2 (git) Affected: 0813299c586b175d7edb25f56412c54b812d0379 , < 70e42feab2e20618ddd0cbfc4ab4b08628236ecd (git)
Linux	Linux	Affected: 5.4.237 , < 5.4.238 (semver) Affected: 5.10.175 , < 5.10.176 (semver) Affected: 5.15.103 , < 5.15.104 (semver) Affected: 6.1.20 , < 6.1.21 (semver) Affected: 6.2.7 , < 6.2.8 (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/namei.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c16cbd8233d6c58fc488545393e49b5d55729990",
              "status": "affected",
              "version": "8dac5a63cf79707b547ea3d425fead5f4482198f",
              "versionType": "git"
            },
            {
              "lessThan": "020166bc6669ca9fb267ebd96bd88c4fb64a5d46",
              "status": "affected",
              "version": "0c440f14558bfacd22c6935ae1fd4b2a09e96b5d",
              "versionType": "git"
            },
            {
              "lessThan": "1c93c42c7bb23057bde8a0a2ab834927ff64d20c",
              "status": "affected",
              "version": "c50fc503ee1b97f12c98e26afc39fdaebebcf04f",
              "versionType": "git"
            },
            {
              "lessThan": "e71eb4dca41f0f36823724ced0406bb2dbdd5506",
              "status": "affected",
              "version": "b0bb13612292ca90fa4c2a7e425375649bc50d3e",
              "versionType": "git"
            },
            {
              "lessThan": "43ce288ab5d7274a4a141d7f5e3ed2ab7b41f8a2",
              "status": "affected",
              "version": "291cd19d107e197306869cb3237c1bba62d13182",
              "versionType": "git"
            },
            {
              "lessThan": "70e42feab2e20618ddd0cbfc4ab4b08628236ecd",
              "status": "affected",
              "version": "0813299c586b175d7edb25f56412c54b812d0379",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/namei.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "5.4.238",
              "status": "affected",
              "version": "5.4.237",
              "versionType": "semver"
            },
            {
              "lessThan": "5.10.176",
              "status": "affected",
              "version": "5.10.175",
              "versionType": "semver"
            },
            {
              "lessThan": "5.15.104",
              "status": "affected",
              "version": "5.15.103",
              "versionType": "semver"
            },
            {
              "lessThan": "6.1.21",
              "status": "affected",
              "version": "6.1.20",
              "versionType": "semver"
            },
            {
              "lessThan": "6.2.8",
              "status": "affected",
              "version": "6.2.7",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.238",
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                  "vulnerable": true
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                }
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              "negate": false,
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix possible double unlock when moving a directory"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached through the `rename(2)` syscall on a locally mounted ext4 filesystem; no network or remote peer is involved. The attacker needs local access to mount/attach the crafted ext4 image and issue the rename.\nAC:L - The `ext4_rename_dir_prepare()` failure is deterministic with a crafted `.`/`..` entry, so the double `up_write()` always occurs, and the attacker controls every thread contending for the moved directory\u0027s `i_rwsem`. The unlock window spans a sleeping `ext4_journal_stop()`, so winning the mutual-exclusion-break race is easy and infinitely retryable.\nPR:L - An ordinary unprivileged local user suffices: on mainstream desktop/kiosk deployments udisks2\u0027s default polkit `allow_active` loop-setup and removable-media automount let a console user mount an arbitrary attacker-authored ext4 image, and the `rename(2)` itself needs only write access to the attacker\u0027s own directories.\nUI:N - In the automount/loop-setup scenario the attacker performs the mount and the rename themselves; no second user has to be induced into any action.\nS:U - The corrupted `i_rwsem`, the resulting concurrent directory mutation, and any memory corruption all stay within the kernel\u0027s own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - Breaking exclusion on a directory inode lets concurrent readers/writers race the inline-dir-to-extent conversion, so dirent parsing runs against the raw inode\u0027s `i_block`/xattr region under a stale format assumption, exposing adjacent kernel memory through `readdir`/`getdents`, and the buffer_head UAF this enables gives a further read primitive.\nI:H - The silent release of another task\u0027s exclusive `i_rwsem` allows two threads to run ext4 dirent add/delete, htree split, and inline-to-extent conversion on the same inode simultaneously, producing metadata and heap corruption \u2014 the exact corruption class `0813299c586b` was written to prevent \u2014 which is leverageable for controlled writes.\nA:H - When the lock is free at the second unlock, the rwsem count underflows to `~0UL` with no owner, so every later `down_read`/`down_write` on that directory blocks permanently in uninterruptible sleep, hanging the directory, the unmount, and eventually tripping the hung-task watchdog. The corruption path independently yields oopses and `errors=remount-ro`/`panic` filesystem shutdown."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:15:11.541Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c16cbd8233d6c58fc488545393e49b5d55729990"
        },
        {
          "url": "https://git.kernel.org/stable/c/020166bc6669ca9fb267ebd96bd88c4fb64a5d46"
        },
        {
          "url": "https://git.kernel.org/stable/c/1c93c42c7bb23057bde8a0a2ab834927ff64d20c"
        },
        {
          "url": "https://git.kernel.org/stable/c/e71eb4dca41f0f36823724ced0406bb2dbdd5506"
        },
        {
          "url": "https://git.kernel.org/stable/c/43ce288ab5d7274a4a141d7f5e3ed2ab7b41f8a2"
        },
        {
          "url": "https://git.kernel.org/stable/c/70e42feab2e20618ddd0cbfc4ab4b08628236ecd"
        }
      ],
      "title": "ext4: fix possible double unlock when moving a directory",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53626",
    "datePublished": "2025-10-07T15:19:30.895Z",
    "dateReserved": "2025-10-07T15:16:59.656Z",
    "dateUpdated": "2026-08-05T09:15:11.541Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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.

Detection rules are retrieved from Rulezet.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.