Vulnerability-Lookup

GHSA-PC3H-M9MC-V77G

Vulnerability from github – Published: 2026-06-25 09:31 – Updated: 2026-06-25 09:31

Details

In the Linux kernel, the following vulnerability has been resolved:

erofs: fix use-after-free on sbi->sync_decompress

z_erofs_decompress_kickoff() can race with filesystem unmount, causing a use-after-free on sbi->sync_decompress.

When I/O completes, z_erofs_endio() calls z_erofs_decompress_kickoff() to queue z_erofs_decompressqueue_work() asynchronously. Then, after all folios are unlocked, unmount workflow can proceed and sbi will be freed before accessing to sbi->sync_decompress.

Thread (unmount) I/O completion kworker queue_work z_erofs_decompressqueue_work (all folios are unlocked) cleanup_mnt .. erofs_kill_sb erofs_sb_free kfree(sbi) access sbi->sync_decompress // UAF!!

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53272"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-25T09:16:45Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix use-after-free on sbi-\u003esync_decompress\n\nz_erofs_decompress_kickoff() can race with filesystem unmount, causing\na use-after-free on sbi-\u003esync_decompress.\n\nWhen I/O completes, z_erofs_endio() calls z_erofs_decompress_kickoff()\nto queue z_erofs_decompressqueue_work() asynchronously. Then, after all\nfolios are unlocked, unmount workflow can proceed and sbi will be freed\nbefore accessing to sbi-\u003esync_decompress.\n\nThread (unmount)        I/O completion        kworker\n                        queue_work\n                                              z_erofs_decompressqueue_work\n                                               (all folios are unlocked)\ncleanup_mnt\n ..\n erofs_kill_sb\n  erofs_sb_free\n   kfree(sbi)\n                        access sbi-\u003esync_decompress  // UAF!!",
  "id": "GHSA-pc3h-m9mc-v77g",
  "modified": "2026-06-25T09:31:23Z",
  "published": "2026-06-25T09:31:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53272"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/00bf6868df65fa95b3854996246d15759fdc7070"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1aee05e814d292064bf5fa15733741040cdc48ba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/86ab00cf81d44b675bb23db62b88fd76c8ac8cea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/95caf60da33d87ed26c28993620f0d92487b0296"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-53272 (GCVE-0-2026-53272)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-25 08:39

Title

erofs: fix use-after-free on sbi->sync_decompress

Summary

In the Linux kernel, the following vulnerability has been resolved: erofs: fix use-after-free on sbi->sync_decompress z_erofs_decompress_kickoff() can race with filesystem unmount, causing a use-after-free on sbi->sync_decompress. When I/O completes, z_erofs_endio() calls z_erofs_decompress_kickoff() to queue z_erofs_decompressqueue_work() asynchronously. Then, after all folios are unlocked, unmount workflow can proceed and sbi will be freed before accessing to sbi->sync_decompress. Thread (unmount) I/O completion kworker queue_work z_erofs_decompressqueue_work (all folios are unlocked) cleanup_mnt .. erofs_kill_sb erofs_sb_free kfree(sbi) access sbi->sync_decompress // UAF!!

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/86ab00cf81d44b675…
https://git.kernel.org/stable/c/00bf6868df65fa95b…
https://git.kernel.org/stable/c/95caf60da33d87ed2…
https://git.kernel.org/stable/c/1aee05e814d292064…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 40452ffca3c1a0f2994e826f9fa213b107f1a2d4 , < 86ab00cf81d44b675bb23db62b88fd76c8ac8cea (git) Affected: 40452ffca3c1a0f2994e826f9fa213b107f1a2d4 , < 00bf6868df65fa95b3854996246d15759fdc7070 (git) Affected: 40452ffca3c1a0f2994e826f9fa213b107f1a2d4 , < 95caf60da33d87ed26c28993620f0d92487b0296 (git) Affected: 40452ffca3c1a0f2994e826f9fa213b107f1a2d4 , < 1aee05e814d292064bf5fa15733741040cdc48ba (git)
Linux	Linux	Affected: 5.17 Unaffected: 0 , < 5.17 (semver) Unaffected: 6.12.94 , ≤ 6.12.* (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/erofs/zdata.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "86ab00cf81d44b675bb23db62b88fd76c8ac8cea",
              "status": "affected",
              "version": "40452ffca3c1a0f2994e826f9fa213b107f1a2d4",
              "versionType": "git"
            },
            {
              "lessThan": "00bf6868df65fa95b3854996246d15759fdc7070",
              "status": "affected",
              "version": "40452ffca3c1a0f2994e826f9fa213b107f1a2d4",
              "versionType": "git"
            },
            {
              "lessThan": "95caf60da33d87ed26c28993620f0d92487b0296",
              "status": "affected",
              "version": "40452ffca3c1a0f2994e826f9fa213b107f1a2d4",
              "versionType": "git"
            },
            {
              "lessThan": "1aee05e814d292064bf5fa15733741040cdc48ba",
              "status": "affected",
              "version": "40452ffca3c1a0f2994e826f9fa213b107f1a2d4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/erofs/zdata.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "lessThan": "5.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.94",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.94",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.36",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.13",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix use-after-free on sbi-\u003esync_decompress\n\nz_erofs_decompress_kickoff() can race with filesystem unmount, causing\na use-after-free on sbi-\u003esync_decompress.\n\nWhen I/O completes, z_erofs_endio() calls z_erofs_decompress_kickoff()\nto queue z_erofs_decompressqueue_work() asynchronously. Then, after all\nfolios are unlocked, unmount workflow can proceed and sbi will be freed\nbefore accessing to sbi-\u003esync_decompress.\n\nThread (unmount)        I/O completion        kworker\n                        queue_work\n                                              z_erofs_decompressqueue_work\n                                               (all folios are unlocked)\ncleanup_mnt\n ..\n erofs_kill_sb\n  erofs_sb_free\n   kfree(sbi)\n                        access sbi-\u003esync_decompress  // UAF!!"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-25T08:39:57.147Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/86ab00cf81d44b675bb23db62b88fd76c8ac8cea"
        },
        {
          "url": "https://git.kernel.org/stable/c/00bf6868df65fa95b3854996246d15759fdc7070"
        },
        {
          "url": "https://git.kernel.org/stable/c/95caf60da33d87ed26c28993620f0d92487b0296"
        },
        {
          "url": "https://git.kernel.org/stable/c/1aee05e814d292064bf5fa15733741040cdc48ba"
        }
      ],
      "title": "erofs: fix use-after-free on sbi-\u003esync_decompress",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53272",
    "datePublished": "2026-06-25T08:39:57.147Z",
    "dateReserved": "2026-06-09T07:44:35.395Z",
    "dateUpdated": "2026-06-25T08:39:57.147Z",
    "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.

Action not permitted

GHSA-PC3H-M9MC-V77G

CVE-2026-53272 (GCVE-0-2026-53272)

Tags

Sightings

Nomenclature