f2fs: fix potential deadlock in gc_merge path of f2fs_balance_fs()

{
  "id": "0b8e84350993a7d01dc1ff0ad20a9e7c40713dda59c08c93cc3439bdd44bd525",
  "url": "https://osv.dev/vulnerability/CVE-2026-68459",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "f2fs: fix potential deadlock in gc_merge path of f2fs_balance_fs()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: f2fs: fix potential deadlock in gc_merge path of f2fs_balance_fs() When we mount device w/ gc_merge mount option, we may suffer below potential deadlock: Kworker GC trehad Truncator - f2fs_write_cache_pages - f2fs_write_single_data_page - f2fs_do_write_data_page - folio_start_writeback --- set writeback flag on folio - f2fs_outplace_write_data : cached folio in internal bio cache - f2fs_balance_fs - wake_up(gc_thread) : wake up gc thread to run foreground GC - finish_wait(fggc_wq) : wait on the waitqueue --- wait on GC thread to finish the work - truncate_inode_pages_range - __filemap_get_folio(, FGP_LOCK) --- lock folio - truncate_inode_partial_folio - folio_wait_writeback --- wait on writeback being cleared - do_garbage_collect - move_data_page - f2fs_get_lock_data_folio - lock on folio --- blocked on folio's lock In order to avoid such deadlock, let's call below functions to commit cached bios in GC_MERGE path of f2fs_balance_fs() as the same as we did in NOGC_MERGE path. - f2fs_submit_merged_write(sbi, DATA); - f2fs_submit_all_merged_ipu_writes(sbi);",
    "evidence": "osv:CVE-2026-68459",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.212",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.178",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.145",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.96",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.39",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-68459",
      "aliases": [
        "CVE-2026-68459"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "351df4b201157351c7d26bf12c3eeb9dbce98854"
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                  "fixed": "8071500a8124e5a6d47d901a8d5ffd91743107a1"
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                {
                  "fixed": "eb02f218aacb36365e0ca2339cbae81fb05d31a5"
                },
                {
                  "fixed": "1436031b33fa23ab1ce7df5bc5500093413e8acf"
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                {
                  "fixed": "b885c7783c19c36c7bf899492a0bffcd68afa8c7"
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                  "fixed": "aa807064473abd6f2cafe419fb77ea402d3e3104"
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                {
                  "fixed": "8b4468ec023d0d1b4669dfb867588997cc03a06b"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68459.json"
          }
        },
        {
          "ranges": [
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              "type": "ECOSYSTEM",
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                  "introduced": "3.8.0"
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                {
                  "fixed": "6.6.145"
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            {
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              "events": [
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68459.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.438085806Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1436031b33fa23ab1ce7df5bc5500093413e8acf",
        "https://git.kernel.org/stable/c/8071500a8124e5a6d47d901a8d5ffd91743107a1",
        "https://git.kernel.org/stable/c/89479a27fa4e1e11f378b3724944eabceb84f114",
        "https://git.kernel.org/stable/c/8b4468ec023d0d1b4669dfb867588997cc03a06b",
        "https://git.kernel.org/stable/c/aa807064473abd6f2cafe419fb77ea402d3e3104",
        "https://git.kernel.org/stable/c/b885c7783c19c36c7bf899492a0bffcd68afa8c7",
        "https://git.kernel.org/stable/c/eb02f218aacb36365e0ca2339cbae81fb05d31a5",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68459.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-68459",
        "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/2026/68xxx/CVE-2026-68459.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-68459",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 493065,
  "published_at": "2026-08-15T05:51:19.713+00:00"
}