Vulnerability-Lookup

GHSA-CRM6-8P5C-4RV5

Vulnerability from github – Published: 2026-10-06 09:31 – Updated: 2026-10-06 09:31

Details

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

btrfs: take commit root semaphore when iterating in mark_block_group_to_copy()

mark_block_group_to_copy() iterates over the commit root with skip_locking=true. A concurrent transaction commit can swap and free the commit root during iteration, causing use-after-free when accessing extent buffers.

Fix it by using path->need_commit_sem to protect the commit root search.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98245"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-06T09:18:12Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: take commit root semaphore when iterating in mark_block_group_to_copy()\n\nmark_block_group_to_copy() iterates over the commit root with\nskip_locking=true. A concurrent transaction commit can swap and free\nthe commit root during iteration, causing use-after-free when\naccessing extent buffers.\n\nFix it by using path-\u003eneed_commit_sem to protect the commit root search.",
  "id": "GHSA-crm6-8p5c-4rv5",
  "modified": "2026-10-06T09:31:32Z",
  "published": "2026-10-06T09:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98245"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0594e3423f4ba3137c734371169491f9a98e9af4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/709f6a5e986535005110c6c69b322f63631cb200"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8e2007b263ea250251ec3021a0a197da990ee1a8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c32490c6d3f3a9f2d177d57c7eb8bbc347561d08"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98245 (GCVE-0-2026-98245)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:45 – Updated: 2026-10-06 08:45

Title

btrfs: take commit root semaphore when iterating in mark_block_group_to_copy()

Summary

In the Linux kernel, the following vulnerability has been resolved: btrfs: take commit root semaphore when iterating in mark_block_group_to_copy() mark_block_group_to_copy() iterates over the commit root with skip_locking=true. A concurrent transaction commit can swap and free the commit root during iteration, causing use-after-free when accessing extent buffers. Fix it by using path->need_commit_sem to protect the commit root search.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 54/100 over 6633 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/8e2007b263ea25025…
https://git.kernel.org/stable/c/709f6a5e986535005…
https://git.kernel.org/stable/c/c32490c6d3f3a9f2d…
https://git.kernel.org/stable/c/0594e3423f4ba3137…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 78ce9fc269af6e69c1399ab910ba6bc81c934f67 , < 8e2007b263ea250251ec3021a0a197da990ee1a8 (git) Affected: 78ce9fc269af6e69c1399ab910ba6bc81c934f67 , < 709f6a5e986535005110c6c69b322f63631cb200 (git) Affected: 78ce9fc269af6e69c1399ab910ba6bc81c934f67 , < c32490c6d3f3a9f2d177d57c7eb8bbc347561d08 (git) Affected: 78ce9fc269af6e69c1399ab910ba6bc81c934f67 , < 0594e3423f4ba3137c734371169491f9a98e9af4 (git)
Linux	Linux	Affected: 5.12 Unaffected: 0 , < 5.12 (semver) Unaffected: 6.12.112 , ≤ 6.12.* (semver) Unaffected: 6.18.54 , ≤ 6.18.* (semver) Unaffected: 7.2.8 , ≤ 7.2.* (semver) Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/dev-replace.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8e2007b263ea250251ec3021a0a197da990ee1a8",
              "status": "affected",
              "version": "78ce9fc269af6e69c1399ab910ba6bc81c934f67",
              "versionType": "git"
            },
            {
              "lessThan": "709f6a5e986535005110c6c69b322f63631cb200",
              "status": "affected",
              "version": "78ce9fc269af6e69c1399ab910ba6bc81c934f67",
              "versionType": "git"
            },
            {
              "lessThan": "c32490c6d3f3a9f2d177d57c7eb8bbc347561d08",
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            },
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/dev-replace.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.12"
            },
            {
              "lessThan": "5.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc4",
              "versionType": "original_commit_for_fix"
            }
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        }
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      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                }
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          "lang": "en",
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        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-06T08:45:14.758Z",
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    "cveId": "CVE-2026-98245",
    "datePublished": "2026-10-06T08:45:14.758Z",
    "dateReserved": "2026-09-25T10:25:14.330Z",
    "dateUpdated": "2026-10-06T08:45:14.758Z",
    "state": "PUBLISHED"
  },
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  "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.

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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GHSA-CRM6-8P5C-4RV5

CVE-2026-98245 (GCVE-0-2026-98245)

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