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CVE-2025-68315 (GCVE-0-2025-68315)

Vulnerability from cvelistv5 – Published: 2025-12-16 15:39 – Updated: 2026-08-05 12:10
VLAI
Title
f2fs: fix to detect potential corrupted nid in free_nid_list
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to detect potential corrupted nid in free_nid_list As reported, on-disk footer.ino and footer.nid is the same and out-of-range, let's add sanity check on f2fs_alloc_nid() to detect any potential corruption in free_nid_list.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < 88b2ddb0c4f1dc874d4598e78cc830c64315ed86 (git)
Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < 9337ed5e777e1c19854928cba7a8131dd00e611b (git)
Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < 6b9525596a83cd5b7bbc2c7bd5f9ad9cf5ad60fa (git)
Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < adbcb34f03abb89e681a5907c4c3ce4bf224991d (git)
Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < 8fc6056dcf79937c46c97fa4996cda65956437a9 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.8
Unaffected: 0 , < 3.8 (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.58 , ≤ 6.12.* (semver)
Unaffected: 6.17.8 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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              "versionType": "semver"
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              "versionType": "semver"
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              "versionType": "semver"
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              "version": "6.18",
              "versionType": "original_commit_for_fix"
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        }
      ],
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to detect potential corrupted nid in free_nid_list\n\nAs reported, on-disk footer.ino and footer.nid is the same and\nout-of-range, let\u0027s add sanity check on f2fs_alloc_nid() to detect\nany potential corruption in free_nid_list."
        }
      ],
      "metrics": [
        {
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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              "lang": "en",
              "value": "AV:N - F2FS supports NFS exports, and a network NFS CREATE request reaches nfsd3_proc_create(), vfs_create(), f2fs_create(), f2fs_new_inode(), and f2fs_alloc_nid(). A writable F2FS-backed NFS server is a reasonable network-facing deployment.\nAC:L - Once an invalid NID is present, allocation deterministically consumes it from the list head; repeated CREATE requests require no race or timing conditions. Older affected kernels also lacked producer-side range validation, allowing corrupted metadata to seed the list directly.\nPR:N - A writable NFS export accepting AUTH_NULL or unauthenticated AUTH_SYS requests permits CREATE without verified credentials. The allocation path itself performs no capability check.\nUI:N - The attacker can trigger allocation directly with network filesystem operations; no victim action is required during exploitation.\nS:U - The vulnerable filesystem code and the affected kernel memory, execution, and storage resources share the same kernel security authority.\nC:H - The invalid NID causes out-of-bounds bitmap and pointer-array reads, and the resulting kernel memory corruption can plausibly be leveraged to disclose arbitrary kernel memory.\nI:H - The unchecked index can drive an out-of-bounds bit clear and counter decrement through free_nid_bitmap and free_nid_count, while also committing invalid node and NAT metadata. These writes can plausibly enable control-flow compromise and persistent filesystem corruption.\nA:H - The out-of-bounds accesses can crash or hang the kernel, while invalid node metadata can force checkpoint failure or persistent filesystem unavailability. Network requests can trigger the condition repeatedly."
            }
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:10:49.846Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/8fc6056dcf79937c46c97fa4996cda65956437a9"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68315",
    "datePublished": "2025-12-16T15:39:45.716Z",
    "dateReserved": "2025-12-16T14:48:05.295Z",
    "dateUpdated": "2026-08-05T12:10:49.846Z",
    "state": "PUBLISHED"
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      "id": "msrc_CVE-2025-68315",
      "initial_release_date": "2025-12-02T00:00:00.000Z",
      "product_status:known_affected": "1",
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      "source": "Microsoft CSAF VEX",
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      "version": "2"
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          }
        ],
        "id": "CVE-2025-68315",
        "lastModified": "2026-07-30T06:24:37.953",
        "metrics": {
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                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
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        "published": "2025-12-16T16:16:11.080",
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      "current_release_date": "2026-08-13T17:35:07+00:00",
      "cve": "CVE-2025-68315",
      "id": "CVE-2025-68315",
      "initial_release_date": "2025-12-16T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel (f2fs): Denial of service or data corruption via f2fs metadata flaw",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68315.json",
      "version": "3"
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  }
}



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  • 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.
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  • 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.


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