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CVE-2026-68459— f2fs: fix potential deadlock in gc_merge path of f2fs_balance_fs()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 3.8版本存在安全漏洞，该漏洞源于f2fs的gc_merge路径中缓存bio未提交，可能导致死锁。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.17% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 351df4b201157351c7d26bf12c3eeb9dbce98854< 8071500a8124e5a6d47d901a8d5ffd91743107a1 affected
351df4b201157351c7d26bf12c3eeb9dbce98854< eb02f218aacb36365e0ca2339cbae81fb05d31a5 affected
351df4b201157351c7d26bf12c3eeb9dbce98854< 1436031b33fa23ab1ce7df5bc5500093413e8acf affected
351df4b201157351c7d26bf12c3eeb9dbce98854< b885c7783c19c36c7bf899492a0bffcd68afa8c7 affected
351df4b201157351c7d26bf12c3eeb9dbce98854< 89479a27fa4e1e11f378b3724944eabceb84f114 affected
351df4b201157351c7d26bf12c3eeb9dbce98854< aa807064473abd6f2cafe419fb77ea402d3e3104 affected
351df4b201157351c7d26bf12c3eeb9dbce98854< 8b4468ec023d0d1b4669dfb867588997cc03a06b affected
3.8 affected
… +8 more rows
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I. Basic Information for CVE-2026-68459

Vulnerability Information
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Vulnerability Title
f2fs: fix potential deadlock in gc_merge path of f2fs_balance_fs()
Source: CVE Program / CVE List V5
Vulnerability Description
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);
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 3.8版本存在安全漏洞，该漏洞源于f2fs的gc_merge路径中缓存bio未提交，可能导致死锁。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 351df4b201157351c7d26bf12c3eeb9dbce98854 ~ 8071500a8124e5a6d47d901a8d5ffd91743107a1 -
Linux Linux 3.8 -

II. Public POCs for CVE-2026-68459

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III. Intelligence Information for CVE-2026-68459

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Patches & Fixes for CVE-2026-68459 (5)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72217 9.8 CRITICAL SUNRPC: Bound-check xdr_buf_to_bvec() stores before writing
CVE-2026-72491 9.8 CRITICAL net/9p: fix race condition on rdma->state in trans_rdma.c
CVE-2026-72221 9.8 CRITICAL sunrpc: wait for in-flight TLS handshake callback when cancel loses race
CVE-2026-72222 9.8 CRITICAL sunrpc: pin svc_xprt across the asynchronous TLS handshake callback
CVE-2026-72220 9.8 CRITICAL sunrpc: harden rq_procinfo lifecycle to prevent double-free
CVE-2026-72398 9.8 CRITICAL sctp: add INIT verification after cookie unpacking
CVE-2026-72477 9.8 CRITICAL fs/ntfs3: call _ntfs_bad_inode() when failing to rename
CVE-2026-72466 9.8 CRITICAL xprtrdma: Fix bcall rep leak and unbounded peek
CVE-2026-72472 9.8 CRITICAL nfs: use nfsi->rwsem to protect traversal of the file lock list
CVE-2026-72473 9.8 CRITICAL xprtrdma: Decouple req recycling from RPC completion
CVE-2026-72399 9.8 CRITICAL net: enetc: check the number of BDs needed for xdp_frame
CVE-2026-74398 9.8 CRITICAL ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68459

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