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CVE-2026-89833— f2fs: fix to avoid potential deadloop in f2fs_fsync_node_pages()

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.

在 Linux 内核中，已修复以下漏洞： f2fs: 修复 f2fs_fsync_node_pages() 中可能导致的死循环 在竞态条件下存在潜在的死循环： 修复说明： 该问题源于线程 A 在执行 过程中，线程 B 并发执行 触发 ，将正在同步的页（folio）的 指针置空。这导致后续 检查失败（返回 false），而同步循环中的终止条件 持续成立，使代码反复跳转到 标签，形成死循环。修复方案通常涉及在获取 folio 引用后检查其有效性，或在 路径中安全地处理正在同步的节点块。

AI Predicted 5.5 Difficulty: Hard EPSS 0.21% · P10

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 608514deba38c8611ad330d6a3c8e2b9a1f68e4b< 161513f53e4ac90fd356433bdf8e31e6adeb92af affected
608514deba38c8611ad330d6a3c8e2b9a1f68e4b< 905411f6504876d268ba8dafc8e75367782da4b7 affected
608514deba38c8611ad330d6a3c8e2b9a1f68e4b< ce366bfa821ec81dd45bde547ee31e659306cc61 affected
4.7 affected
< 4.7 unaffected
6.18.51≤ 6.18.* unaffected
7.2.5≤ 7.2.* unaffected
7.3-rc1≤ * unaffected
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I. Basic Information for CVE-2026-89833

Vulnerability Information
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Vulnerability Title
f2fs: fix to avoid potential deadloop in f2fs_fsync_node_pages()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid potential deadloop in f2fs_fsync_node_pages() There is potential deadloop in race condition: Thread A Thread B - fsync - f2fs_do_sync_file - f2fs_fsync_node_pages - last_fsync_dnode - folio_get(last_folio) - f2fs_setattr - f2fs_truncate - f2fs_truncate_blocks - f2fs_do_truncate_blocks - f2fs_truncate_inode_blocks - truncate_dnode - truncate_node - invalidate_mapping_pages - folio->mapping = NULL - is_node_folio alwasy return false - atomic && !marked is always true, then goto retry
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 608514deba38c8611ad330d6a3c8e2b9a1f68e4b ~ 161513f53e4ac90fd356433bdf8e31e6adeb92af -
Linux Linux 4.7 -

II. Public POCs for CVE-2026-89833

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III. Intelligence Information for CVE-2026-89833

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Other References for CVE-2026-89833 (3)

Same Patch Batch · Linux · 2026-09-16 · 276 CVEs total

CVE-2026-90048 9.8 CRITICAL fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()
CVE-2026-90012 9.8 CRITICAL spi: Fix DMA mapping ownership on partial map failure
CVE-2026-89970 9.8 CRITICAL nvmet-auth: Synchronize timeout work during SQ teardown
CVE-2026-89857 9.8 CRITICAL scsi: qla2xxx: Hold qpair lock when sending NVMe LS reject
CVE-2026-89969 9.8 CRITICAL nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU
CVE-2026-89847 9.8 CRITICAL scsi: qla2xxx: Avoid double completion in async IOCB timeout
CVE-2026-89972 9.8 CRITICAL nvme: add missing SRCU grace period in error path
CVE-2026-89990 9.8 CRITICAL ceph: lock mutex in ceph_mds_check_access()
CVE-2026-90036 9.8 CRITICAL NFSD: Prevent client use-after-free during blocked-lock reaping
CVE-2026-90038 9.8 CRITICAL NFSD: Prevent client use-after-free during export state revocation
CVE-2026-90037 9.8 CRITICAL NFSD: Prevent client use-after-free during close_lru reaping
CVE-2026-89788 9.8 CRITICAL ksmbd: fix tree connection use-after-free in smb2_tree_connect()
CVE-2026-89783 9.8 CRITICAL xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full
CVE-2026-90042 9.8 CRITICAL ceph: properly decrypt filenames in vmalloc() buffers
CVE-2026-89778 9.8 CRITICAL isofs: fix out-of-bounds page array access on empty zisofs block
CVE-2026-89915 9.3 CRITICAL KVM: arm64: Remove VM-wide VNCR mapping counter
CVE-2026-90049 9.3 CRITICAL net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy()
CVE-2026-89775 9.3 CRITICAL KVM: arm64: Handle negative S1 walk levels in VNCR TLB size evaluation
CVE-2026-89916 9.3 CRITICAL KVM: arm64: Make VNCR invalidation participate in MMU invalidation retry
CVE-2026-89930 9.3 CRITICAL KVM: nVMX: Service local TLB flushes on failed nested VM-Enter

Showing top 20 of 276 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-89833

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