f2fs: protect extension_list reading with sb_lock in f2fs_sbi_show()

{
  "id": "c74bc1a7c69a75f04682ae37611a23725740ce6630da0d178f86407d5c8af573",
  "url": "https://osv.dev/vulnerability/CVE-2026-53303",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "f2fs: protect extension_list reading with sb_lock in f2fs_sbi_show()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: f2fs: protect extension_list reading with sb_lock in f2fs_sbi_show() In f2fs_sbi_show(), the extension_list, extension_count and hot_ext_count are read without holding sbi->sb_lock. If a concurrent sysfs store modifies the extension list via f2fs_update_extension_list(), the show path may read inconsistent count and array contents, potentially leading to out-of-bounds access or displaying stale data. Fix this by holding sb_lock around the entire extension list read and format operation.",
    "evidence": "osv:CVE-2026-53303",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.175",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.141",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.91",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.33",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-53303",
      "aliases": [
        "CVE-2026-53303"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b6a06cbbb5f7fd03589cff9178314af04c568826"
                },
                {
                  "fixed": "d3ff0c121bbaef026df6248ab7ef6f0b068b0647"
                },
                {
                  "fixed": "cea15f66b7b68b2c50943a6660e0692c6635e4eb"
                },
                {
                  "fixed": "4b3a1bf4c2ffd4c9595d900ead78c9035894a025"
                },
                {
                  "fixed": "d0e877810baf613b018fd9747440b9d4d9db1428"
                },
                {
                  "fixed": "ea3ab43a1f3cf2c7cecd75c8be1ee99a5e94a92e"
                },
                {
                  "fixed": "5909bedbed38c558bee7cb6758ceedf9bc3a9194"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53303.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.17.0"
                },
                {
                  "fixed": "6.1.175"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.141"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.91"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.33"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53303.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.337479215Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/4b3a1bf4c2ffd4c9595d900ead78c9035894a025",
        "https://git.kernel.org/stable/c/5909bedbed38c558bee7cb6758ceedf9bc3a9194",
        "https://git.kernel.org/stable/c/cea15f66b7b68b2c50943a6660e0692c6635e4eb",
        "https://git.kernel.org/stable/c/d0e877810baf613b018fd9747440b9d4d9db1428",
        "https://git.kernel.org/stable/c/d3ff0c121bbaef026df6248ab7ef6f0b068b0647",
        "https://git.kernel.org/stable/c/ea3ab43a1f3cf2c7cecd75c8be1ee99a5e94a92e",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53303.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53303",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53303.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53303",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 493615,
  "published_at": "2026-06-26T19:40:59.383+00:00"
}