---
cve: "CVE-2026-68459"
severity: "LOW"
cvss: 3.1
epss: "17%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-08-15 06:18:15"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-03T00:31:06+02:00"
---

# CVE-2026-68459

> 3.1 LOW

## Beschreibung

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);

## Patch verfügbar (OSV)

- Kernel ≥ 5.15.212
- Kernel ≥ 6.1.178
- Kernel ≥ 6.6.145
- Kernel ≥ 6.12.96
- Kernel ≥ 6.18.39
- Kernel ≥ 7.1.5

## Referenzen

- <https://git.kernel.org/stable/c/8071500a8124e5a6d47d901a8d5ffd91743107a1>
- <https://git.kernel.org/stable/c/eb02f218aacb36365e0ca2339cbae81fb05d31a5>
- <https://git.kernel.org/stable/c/1436031b33fa23ab1ce7df5bc5500093413e8acf>
- <https://git.kernel.org/stable/c/b885c7783c19c36c7bf899492a0bffcd68afa8c7>
- <https://git.kernel.org/stable/c/89479a27fa4e1e11f378b3724944eabceb84f114>
- <https://git.kernel.org/stable/c/aa807064473abd6f2cafe419fb77ea402d3e3104>
- <https://git.kernel.org/stable/c/8b4468ec023d0d1b4669dfb867588997cc03a06b>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-68459) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_