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GHSA-XVWX-4PM6-JF3G

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

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

ocfs2: reject FITRIM ranges shorter than a cluster

ocfs2_trim_mainbm() trims the global bitmap in cluster units, but its too-short range validation only checks sb->s_blocksize.

On filesystems with a cluster size larger than the block size, a FITRIM range that is at least one block but shorter than one cluster is accepted and shifted down to len == 0. The later start + len - 1 and len -= ... arithmetic then underflows and can drive trimming past the requested range.

Reject ranges shorter than s_clustersize instead. That preserves the existing -EINVAL behavior for requests that cannot discard even one allocation unit and keeps zero-cluster trims out of the group walk.

Severity

7.1 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74349"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:36Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: reject FITRIM ranges shorter than a cluster\n\nocfs2_trim_mainbm() trims the global bitmap in cluster units, but its\ntoo-short range validation only checks sb-\u003es_blocksize.\n\nOn filesystems with a cluster size larger than the block size, a FITRIM\nrange that is at least one block but shorter than one cluster is accepted\nand shifted down to len == 0.  The later start + len - 1 and len -= ... \narithmetic then underflows and can drive trimming past the requested\nrange.\n\nReject ranges shorter than s_clustersize instead.  That preserves the\nexisting -EINVAL behavior for requests that cannot discard even one\nallocation unit and keeps zero-cluster trims out of the group walk.",
  "id": "GHSA-xvwx-4pm6-jf3g",
  "modified": "2026-08-17T06:33:40Z",
  "published": "2026-08-15T06:32:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74349"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/06c0a0431b9856506fcd9b2c1b0c6136567d756d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2c13e02592b918be7725ab5965e01ef4e46c4b57"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/346314bb0cc2fc52b50b73d6ecc62e0217455c2e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3fa7139b5f42731a61f78c42433adae13f9adc21"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/441abb77222f155e8d931dbabb465466db01cfd7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ca1afd88f5eaaff9168e1466e5401385edf59543"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d903d59c0315f59bdf0214b4f13d71c9feb2c45c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e652d0f5108e447b22da4249bcd23dd1b63c73dd"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74349 (GCVE-0-2026-74349)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:46

Title

ocfs2: reject FITRIM ranges shorter than a cluster

Summary

In the Linux kernel, the following vulnerability has been resolved: ocfs2: reject FITRIM ranges shorter than a cluster ocfs2_trim_mainbm() trims the global bitmap in cluster units, but its too-short range validation only checks sb->s_blocksize. On filesystems with a cluster size larger than the block size, a FITRIM range that is at least one block but shorter than one cluster is accepted and shifted down to len == 0. The later start + len - 1 and len -= ... arithmetic then underflows and can drive trimming past the requested range. Reject ranges shorter than s_clustersize instead. That preserves the existing -EINVAL behavior for requests that cannot discard even one allocation unit and keeps zero-cluster trims out of the group walk.

Severity

7.1 (High)


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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/d903d59c0315f59bd…
https://git.kernel.org/stable/c/441abb77222f155e8…
https://git.kernel.org/stable/c/e652d0f5108e447b2…
https://git.kernel.org/stable/c/346314bb0cc2fc52b…
https://git.kernel.org/stable/c/06c0a0431b9856506…
https://git.kernel.org/stable/c/3fa7139b5f42731a6…
https://git.kernel.org/stable/c/2c13e02592b918be7…
https://git.kernel.org/stable/c/ca1afd88f5eaaff91…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: aa89762c54800208d5afdcd8e6bf124818f17fe0 , < d903d59c0315f59bdf0214b4f13d71c9feb2c45c (git) Affected: aa89762c54800208d5afdcd8e6bf124818f17fe0 , < 441abb77222f155e8d931dbabb465466db01cfd7 (git) Affected: aa89762c54800208d5afdcd8e6bf124818f17fe0 , < e652d0f5108e447b22da4249bcd23dd1b63c73dd (git) Affected: aa89762c54800208d5afdcd8e6bf124818f17fe0 , < 346314bb0cc2fc52b50b73d6ecc62e0217455c2e (git) Affected: aa89762c54800208d5afdcd8e6bf124818f17fe0 , < 06c0a0431b9856506fcd9b2c1b0c6136567d756d (git) Affected: aa89762c54800208d5afdcd8e6bf124818f17fe0 , < 3fa7139b5f42731a61f78c42433adae13f9adc21 (git) Affected: aa89762c54800208d5afdcd8e6bf124818f17fe0 , < 2c13e02592b918be7725ab5965e01ef4e46c4b57 (git) Affected: aa89762c54800208d5afdcd8e6bf124818f17fe0 , < ca1afd88f5eaaff9168e1466e5401385edf59543 (git)
Linux	Linux	Affected: 3.14 Unaffected: 0 , < 3.14 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ocfs2/alloc.c"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
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              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
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              "versionType": "semver"
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              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
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              "status": "unaffected",
              "version": "6.18.40",
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "7.2",
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: reject FITRIM ranges shorter than a cluster\n\nocfs2_trim_mainbm() trims the global bitmap in cluster units, but its\ntoo-short range validation only checks sb-\u003es_blocksize.\n\nOn filesystems with a cluster size larger than the block size, a FITRIM\nrange that is at least one block but shorter than one cluster is accepted\nand shifted down to len == 0.  The later start + len - 1 and len -= ... \narithmetic then underflows and can drive trimming past the requested\nrange.\n\nReject ranges shorter than s_clustersize instead.  That preserves the\nexisting -EINVAL behavior for requests that cannot discard even one\nallocation unit and keeps zero-cluster trims out of the group walk."
        }
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              "value": "AV:L - Exploitation requires a local FITRIM ioctl on an open OCFS2 mount (typically via fstrim or ioctl on the mountpoint); there is no network-facing OCFS2 handler or remote protocol path to this code.\nAC:L - An attacker with the required privileges can reliably trigger the bug by supplying a FITRIM range at least one block long but shorter than one cluster, which is common when OCFS2 cluster size exceeds the 4K block size.\nPR:L - The FITRIM handler explicitly requires capable(CAP_SYS_ADMIN) before calling ocfs2_trim_fs(); per kernel CNA guidance this maps to Low because CAP_SYS_ADMIN can be held by root inside a user namespace.\nUI:N - No victim interaction is required; the privileged attacker directly issues the FITRIM ioctl with crafted range parameters to trigger the faulty trim logic.\nS:U - Impact is confined to erroneous discard/trim operations within the same privileged filesystem context on the affected host and shared storage; it does not cross VM, container, or IOMMU security boundaries.\nC:N - The flaw causes incorrect discard of free clusters via sb_issue_discard and integer underflow in range arithmetic; it does not read kernel memory, leak pointers, or expose sensitive data to the attacker.\nI:H - Unsigned underflow can drive trimming far beyond the requested FITRIM range, issuing discard on extensive free-space regions on shared cluster storage and risking unintended loss or corruption of filesystem data integrity.\nA:H - Corrupted len/last_group values can cause prolonged iteration through cluster groups while holding the exclusive OCFS2 cluster-wide trim DLM lock, enabling severe denial of service or hang for the node and other cluster members."
            }
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        {
          "url": "https://git.kernel.org/stable/c/ca1afd88f5eaaff9168e1466e5401385edf59543"
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      "title": "ocfs2: reject FITRIM ranges shorter than a cluster",
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    "datePublished": "2026-08-15T05:58:36.630Z",
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    "state": "PUBLISHED"
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}

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.

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