exfat: fix random stack corruption after get_block

{
  "id": "df43d238a43072ea51c81ad4308d8b0d9fd66bf1d4b363bff4dd9700f93cd080",
  "url": "https://osv.dev/vulnerability/CVE-2025-22036",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "exfat: fix random stack corruption after get_block",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: exfat: fix random stack corruption after get_block When get_block is called with a buffer_head allocated on the stack, such as do_mpage_readpage, stack corruption due to buffer_head UAF may occur in the following race condition situation. mpage_read_folio <> do_mpage_readpage exfat_get_block bh_read __bh_read get_bh(bh) submit_bh wait_on_buffer ... end_buffer_read_sync __end_buffer_read_notouch unlock_buffer <> ... ... ... ... <> . . another_function <> put_bh(bh) atomic_dec(bh->b_count) * stack corruption here * This patch returns -EAGAIN if a folio does not have buffers when bh_read needs to be called. By doing this, the caller can fallback to functions like block_read_full_folio(), create a buffer_head in the folio, and then call get_block again. Let's do not call bh_read() with on-stack buffer_head.",
    "evidence": "osv:CVE-2025-22036",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.23",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.13.11",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.14.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-22036",
      "aliases": [
        "CVE-2025-22036"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "11a347fb6cef62ce47e84b97c45f2b2497c7593b"
                },
                {
                  "fixed": "49b0a6ab8e528a0c1c50e37cef9b9c7c121365f2"
                },
                {
                  "fixed": "f7447286363dc1e410bf30b87d75168f3519f9cc"
                },
                {
                  "fixed": "f807a6bf2005740fa26b4f59c4a003dc966b9afd"
                },
                {
                  "fixed": "1bb7ff4204b6d4927e982cd256286c09ed4fd8ca"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-22036.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.8.0"
                },
                {
                  "fixed": "6.12.23"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.13.11"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.14.0"
                },
                {
                  "fixed": "6.14.2"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-22036.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.022611251Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1bb7ff4204b6d4927e982cd256286c09ed4fd8ca",
        "https://git.kernel.org/stable/c/49b0a6ab8e528a0c1c50e37cef9b9c7c121365f2",
        "https://git.kernel.org/stable/c/f7447286363dc1e410bf30b87d75168f3519f9cc",
        "https://git.kernel.org/stable/c/f807a6bf2005740fa26b4f59c4a003dc966b9afd",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/22xxx/CVE-2025-22036.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-22036",
        "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/2025/22xxx/CVE-2025-22036.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-22036",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 498868,
  "published_at": "2025-04-16T14:11:54.916+00:00"
}