Vulnerability-Lookup

GHSA-48CW-6CGR-R587

Vulnerability from github – Published: 2026-01-13 18:31 – Updated: 2026-01-13 18:31

Details

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

ocfs2: fix kernel BUG in ocfs2_find_victim_chain

syzbot reported a kernel BUG in ocfs2_find_victim_chain() because the cl_next_free_rec field of the allocation chain list (next free slot in the chain list) is 0, triggring the BUG_ON(!cl->cl_next_free_rec) condition in ocfs2_find_victim_chain() and panicking the kernel.

To fix this, an if condition is introduced in ocfs2_claim_suballoc_bits(), just before calling ocfs2_find_victim_chain(), the code block in it being executed when either of the following conditions is true:

cl_next_free_rec is equal to 0, indicating that there are no free chains in the allocation chain list
cl_next_free_rec is greater than cl_count (the total number of chains in the allocation chain list)

Either of them being true is indicative of the fact that there are no chains left for usage.

This is addressed using ocfs2_error(), which prints the error log for debugging purposes, rather than panicking the kernel.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2025-68771"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-13T16:15:56Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix kernel BUG in ocfs2_find_victim_chain\n\nsyzbot reported a kernel BUG in ocfs2_find_victim_chain() because the\n`cl_next_free_rec` field of the allocation chain list (next free slot in\nthe chain list) is 0, triggring the BUG_ON(!cl-\u003ecl_next_free_rec)\ncondition in ocfs2_find_victim_chain() and panicking the kernel.\n\nTo fix this, an if condition is introduced in ocfs2_claim_suballoc_bits(),\njust before calling ocfs2_find_victim_chain(), the code block in it being\nexecuted when either of the following conditions is true:\n\n1. `cl_next_free_rec` is equal to 0, indicating that there are no free\nchains in the allocation chain list\n2. `cl_next_free_rec` is greater than `cl_count` (the total number of\nchains in the allocation chain list)\n\nEither of them being true is indicative of the fact that there are no\nchains left for usage.\n\nThis is addressed using ocfs2_error(), which prints\nthe error log for debugging purposes, rather than panicking the kernel.",
  "id": "GHSA-48cw-6cgr-r587",
  "modified": "2026-01-13T18:31:03Z",
  "published": "2026-01-13T18:31:03Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68771"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/039bef30e320827bac8990c9f29d2a68cd8adb5f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7acc0390e0dd7474c4451d05465a677d55ad4268"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/96f1b074c98c20f55a3b23d2ab44d9fb0f619869"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b08a33d5f80efe6979a6e8f905c1a898910c21dd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e24aedae71652d4119049f1fbef6532ccbe3966d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2025-68771 (GCVE-0-2025-68771)

Vulnerability from cvelistv5 – Published: 2026-01-13 15:28 – Updated: 2026-01-14 08:51

Title

ocfs2: fix kernel BUG in ocfs2_find_victim_chain

Summary

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix kernel BUG in ocfs2_find_victim_chain syzbot reported a kernel BUG in ocfs2_find_victim_chain() because the `cl_next_free_rec` field of the allocation chain list (next free slot in the chain list) is 0, triggring the BUG_ON(!cl->cl_next_free_rec) condition in ocfs2_find_victim_chain() and panicking the kernel. To fix this, an if condition is introduced in ocfs2_claim_suballoc_bits(), just before calling ocfs2_find_victim_chain(), the code block in it being executed when either of the following conditions is true: 1. `cl_next_free_rec` is equal to 0, indicating that there are no free chains in the allocation chain list 2. `cl_next_free_rec` is greater than `cl_count` (the total number of chains in the allocation chain list) Either of them being true is indicative of the fact that there are no chains left for usage. This is addressed using ocfs2_error(), which prints the error log for debugging purposes, rather than panicking the kernel.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/b08a33d5f80efe697…
	https://git.kernel.org/stable/c/96f1b074c98c20f55…
	https://git.kernel.org/stable/c/e24aedae71652d411…
	https://git.kernel.org/stable/c/7acc0390e0dd7474c…
	https://git.kernel.org/stable/c/039bef30e320827ba…

Impacted products

Vendor

Product

Version

Linux

Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < b08a33d5f80efe6979a6e8f905c1a898910c21dd (git)
Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < 96f1b074c98c20f55a3b23d2ab44d9fb0f619869 (git)
Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < e24aedae71652d4119049f1fbef6532ccbe3966d (git)
Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < 7acc0390e0dd7474c4451d05465a677d55ad4268 (git)
Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < 039bef30e320827bac8990c9f29d2a68cd8adb5f (git)

Linux

Affected: 2.6.16
Unaffected: 0 , < 2.6.16 (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.64 , ≤ 6.12.* (semver)
Unaffected: 6.18.3 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ocfs2/suballoc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b08a33d5f80efe6979a6e8f905c1a898910c21dd",
              "status": "affected",
              "version": "ccd979bdbce9fba8412beb3f1de68a9d0171b12c",
              "versionType": "git"
            },
            {
              "lessThan": "96f1b074c98c20f55a3b23d2ab44d9fb0f619869",
              "status": "affected",
              "version": "ccd979bdbce9fba8412beb3f1de68a9d0171b12c",
              "versionType": "git"
            },
            {
              "lessThan": "e24aedae71652d4119049f1fbef6532ccbe3966d",
              "status": "affected",
              "version": "ccd979bdbce9fba8412beb3f1de68a9d0171b12c",
              "versionType": "git"
            },
            {
              "lessThan": "7acc0390e0dd7474c4451d05465a677d55ad4268",
              "status": "affected",
              "version": "ccd979bdbce9fba8412beb3f1de68a9d0171b12c",
              "versionType": "git"
            },
            {
              "lessThan": "039bef30e320827bac8990c9f29d2a68cd8adb5f",
              "status": "affected",
              "version": "ccd979bdbce9fba8412beb3f1de68a9d0171b12c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ocfs2/suballoc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.16"
            },
            {
              "lessThan": "2.6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.120",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.64",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.160",
                  "versionStartIncluding": "2.6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.120",
                  "versionStartIncluding": "2.6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.64",
                  "versionStartIncluding": "2.6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.3",
                  "versionStartIncluding": "2.6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19-rc1",
                  "versionStartIncluding": "2.6.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix kernel BUG in ocfs2_find_victim_chain\n\nsyzbot reported a kernel BUG in ocfs2_find_victim_chain() because the\n`cl_next_free_rec` field of the allocation chain list (next free slot in\nthe chain list) is 0, triggring the BUG_ON(!cl-\u003ecl_next_free_rec)\ncondition in ocfs2_find_victim_chain() and panicking the kernel.\n\nTo fix this, an if condition is introduced in ocfs2_claim_suballoc_bits(),\njust before calling ocfs2_find_victim_chain(), the code block in it being\nexecuted when either of the following conditions is true:\n\n1. `cl_next_free_rec` is equal to 0, indicating that there are no free\nchains in the allocation chain list\n2. `cl_next_free_rec` is greater than `cl_count` (the total number of\nchains in the allocation chain list)\n\nEither of them being true is indicative of the fact that there are no\nchains left for usage.\n\nThis is addressed using ocfs2_error(), which prints\nthe error log for debugging purposes, rather than panicking the kernel."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-14T08:51:26.289Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b08a33d5f80efe6979a6e8f905c1a898910c21dd"
        },
        {
          "url": "https://git.kernel.org/stable/c/96f1b074c98c20f55a3b23d2ab44d9fb0f619869"
        },
        {
          "url": "https://git.kernel.org/stable/c/e24aedae71652d4119049f1fbef6532ccbe3966d"
        },
        {
          "url": "https://git.kernel.org/stable/c/7acc0390e0dd7474c4451d05465a677d55ad4268"
        },
        {
          "url": "https://git.kernel.org/stable/c/039bef30e320827bac8990c9f29d2a68cd8adb5f"
        }
      ],
      "title": "ocfs2: fix kernel BUG in ocfs2_find_victim_chain",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68771",
    "datePublished": "2026-01-13T15:28:49.272Z",
    "dateReserved": "2025-12-24T10:30:51.035Z",
    "dateUpdated": "2026-01-14T08:51:26.289Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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-48CW-6CGR-R587

CVE-2025-68771 (GCVE-0-2025-68771)

Tags

Sightings

Nomenclature