CVE-2026-68459 (GCVE-0-2026-68459)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-08-17 05:06
VLAI
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);
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6992 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 351df4b201157351c7d26bf12c3eeb9dbce98854 , < 8071500a8124e5a6d47d901a8d5ffd91743107a1 (git)
Affected: 351df4b201157351c7d26bf12c3eeb9dbce98854 , < eb02f218aacb36365e0ca2339cbae81fb05d31a5 (git)
Affected: 351df4b201157351c7d26bf12c3eeb9dbce98854 , < 1436031b33fa23ab1ce7df5bc5500093413e8acf (git)
Affected: 351df4b201157351c7d26bf12c3eeb9dbce98854 , < b885c7783c19c36c7bf899492a0bffcd68afa8c7 (git)
Affected: 351df4b201157351c7d26bf12c3eeb9dbce98854 , < 89479a27fa4e1e11f378b3724944eabceb84f114 (git)
Affected: 351df4b201157351c7d26bf12c3eeb9dbce98854 , < aa807064473abd6f2cafe419fb77ea402d3e3104 (git)
Affected: 351df4b201157351c7d26bf12c3eeb9dbce98854 , < 8b4468ec023d0d1b4669dfb867588997cc03a06b (git)
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Linux Linux Affected: 3.8
Unaffected: 0 , < 3.8 (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix potential deadlock in gc_merge path of f2fs_balance_fs()\n\nWhen we mount device w/ gc_merge mount option, we may suffer below\npotential deadlock:\n\nKworker\t\t\t\t\tGC trehad\t\t\tTruncator\n- f2fs_write_cache_pages\n - f2fs_write_single_data_page\n  - f2fs_do_write_data_page\n   - folio_start_writeback  --- set writeback flag on folio\n   - f2fs_outplace_write_data\n   : cached folio in internal bio cache\n  - f2fs_balance_fs\n   - wake_up(gc_thread)\n   : wake up gc thread to run foreground GC\n   - finish_wait(fggc_wq)\n   : wait on the waitqueue --- wait on GC thread to finish the work\n\t\t\t\t\t\t\t\t\t- truncate_inode_pages_range\n\t\t\t\t\t\t\t\t\t - __filemap_get_folio(, FGP_LOCK)  --- lock folio\n\t\t\t\t\t\t\t\t\t - truncate_inode_partial_folio\n\t\t\t\t\t\t\t\t\t  - folio_wait_writeback            --- wait on writeback being cleared\n\t\t\t\t\t- do_garbage_collect\n\t\t\t\t\t - move_data_page\n\t\t\t\t\t  - f2fs_get_lock_data_folio\n\t\t\t\t\t   - lock on folio  --- blocked on folio\u0027s lock\n\nIn order to avoid such deadlock, let\u0027s call below functions to commit\ncached bios in GC_MERGE path of f2fs_balance_fs() as the same as we did\nin NOGC_MERGE path.\n- f2fs_submit_merged_write(sbi, DATA);\n- f2fs_submit_all_merged_ipu_writes(sbi);"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:06:00.080Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/8071500a8124e5a6d47d901a8d5ffd91743107a1"
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          "url": "https://git.kernel.org/stable/c/eb02f218aacb36365e0ca2339cbae81fb05d31a5"
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        {
          "url": "https://git.kernel.org/stable/c/8b4468ec023d0d1b4669dfb867588997cc03a06b"
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      "title": "f2fs: fix potential deadlock in gc_merge path of f2fs_balance_fs()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68459",
    "datePublished": "2026-08-15T05:51:19.713Z",
    "dateReserved": "2026-07-30T09:28:09.395Z",
    "dateUpdated": "2026-08-17T05:06:00.080Z",
    "state": "PUBLISHED"
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      "date": "2026-10-20",
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        "descriptions": [
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix potential deadlock in gc_merge path of f2fs_balance_fs()\n\nWhen we mount device w/ gc_merge mount option, we may suffer below\npotential deadlock:\n\nKworker\t\t\t\t\tGC trehad\t\t\tTruncator\n- f2fs_write_cache_pages\n - f2fs_write_single_data_page\n  - f2fs_do_write_data_page\n   - folio_start_writeback  --- set writeback flag on folio\n   - f2fs_outplace_write_data\n   : cached folio in internal bio cache\n  - f2fs_balance_fs\n   - wake_up(gc_thread)\n   : wake up gc thread to run foreground GC\n   - finish_wait(fggc_wq)\n   : wait on the waitqueue --- wait on GC thread to finish the work\n\t\t\t\t\t\t\t\t\t- truncate_inode_pages_range\n\t\t\t\t\t\t\t\t\t - __filemap_get_folio(, FGP_LOCK)  --- lock folio\n\t\t\t\t\t\t\t\t\t - truncate_inode_partial_folio\n\t\t\t\t\t\t\t\t\t  - folio_wait_writeback            --- wait on writeback being cleared\n\t\t\t\t\t- do_garbage_collect\n\t\t\t\t\t - move_data_page\n\t\t\t\t\t  - f2fs_get_lock_data_folio\n\t\t\t\t\t   - lock on folio  --- blocked on folio\u0027s lock\n\nIn order to avoid such deadlock, let\u0027s call below functions to commit\ncached bios in GC_MERGE path of f2fs_balance_fs() as the same as we did\nin NOGC_MERGE path.\n- f2fs_submit_merged_write(sbi, DATA);\n- f2fs_submit_all_merged_ipu_writes(sbi);"
          }
        ],
        "id": "CVE-2026-68459",
        "lastModified": "2026-08-17T06:17:55.127",
        "metrics": {},
        "published": "2026-08-15T06:18:15.460",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1436031b33fa23ab1ce7df5bc5500093413e8acf"
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          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T14:59:53+00:00",
      "cve": "CVE-2026-68459",
      "id": "CVE-2026-68459",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: f2fs: fix potential deadlock in gc_merge path of f2fs_balance_fs()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68459.json",
      "version": "3"
    }
  }
}



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