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CVE-2026-93269— ext4: fix circular lock dependency in ext4_ext_migrate

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： ext4: 修复 ext4_ext_migrate 中的循环锁依赖 将 移至 之后，以避免 与 （冻结保护）之间出现循环锁依赖。 死锁场景如下： 是一个临时的 inode（其 ），仅用于构建 extents 树。其释放（eviction）不需要 保护，因此推迟 操作至释放读写信号量（rwsem）之后是安全的。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1690 · Prevent Command History Logging

Affected Version Matrix 22

VendorProduct Version RangeStatus
Linux Linux cb85f4d23f794e24127f3e562cb3b54b0803f456< 452950461241dfed8b1d32e94b227db38c99c5af affected
cb85f4d23f794e24127f3e562cb3b54b0803f456< ada23457d4748d6e9c36c6f871fc29a6f558c48c affected
cb85f4d23f794e24127f3e562cb3b54b0803f456< e4223231b6860141813637a6413c2371ae4d6fa8 affected
cb85f4d23f794e24127f3e562cb3b54b0803f456< 32f7ab52875ec7f800ca67e7176e5743a84baddf affected
cb85f4d23f794e24127f3e562cb3b54b0803f456< a897682793eba5de51ee6f3152760374afa629cf affected
eb799e163dc2bc1ea0a4820b66f79d32a5e907df affected
bcc1eab71a67c46b9e24544ac7923f44444174ce affected
8cf20fb73e73a4c4df0328b5297842c5ef34fdd9 affected
… +14 more rows
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I. Basic Information for CVE-2026-93269

Vulnerability Information
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Vulnerability Title
ext4: fix circular lock dependency in ext4_ext_migrate
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix circular lock dependency in ext4_ext_migrate Move iput(tmp_inode) after ext4_writepages_up_write() to avoid a circular lock dependency between s_writepages_rwsem and sb_internal (freeze protection). The deadlock scenario: CPU0 (EXT4_IOC_MIGRATE) CPU1 (orphan cleanup during mount) ---- ---- ext4_ext_migrate() ext4_writepages_down_write() s_writepages_rwsem (write) ext4_evict_inode() sb_start_intwrite() [sb_internal] ... ext4_writepages() s_writepages_rwsem (read) [BLOCKED] iput(tmp_inode) ext4_evict_inode() sb_start_intwrite() [BLOCKED] The tmp_inode is a temporary inode with nlink=0 created solely for building the extent tree. Its eviction does not require s_writepages_rwsem protection, so deferring iput() until after releasing the rwsem is safe.
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 cb85f4d23f794e24127f3e562cb3b54b0803f456 ~ 452950461241dfed8b1d32e94b227db38c99c5af -
Linux Linux 5.6 -

II. Public POCs for CVE-2026-93269

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III. Intelligence Information for CVE-2026-93269

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Patches & Fixes for CVE-2026-93269 (5)

Same Patch Batch · Linux · 2026-09-24 · 234 CVEs total

CVE-2026-93207 9.8 CRITICAL SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry
CVE-2026-97413 9.8 CRITICAL RDMA/rtrs-srv: Fix integer underflow in process_read and process_write
CVE-2026-93228 9.1 CRITICAL svcrdma: Reject Write/Reply chunks with segcount 0
CVE-2026-93793 8.8 HIGH wifi: iwlwifi: mvm: validate TX_CMD response layout
CVE-2026-93799 8.8 HIGH wifi: iwlwifi: mvm: validate sta_id in BA window status notif
CVE-2026-93790 8.8 HIGH wifi: iwlwifi: mvm: fix out-of-bounds tid_data access in BA notif
CVE-2026-93806 8.8 HIGH wifi: cfg80211: validate assoc response length before status and IE access
CVE-2026-97442 8.8 HIGH wifi: ath11k: fix invalid data access in ath11k_dp_rx_h_undecap_nwifi
CVE-2026-97509 8.8 HIGH thunderbolt: Keep XDomain reference during the lifetime of a service
CVE-2026-97409 8.8 HIGH nvme-fc: Do not cancel requests in io target before it is initialized
CVE-2026-93280 8.8 HIGH greybus: audio: bound the topology section sizes against the fetched size
CVE-2026-93284 8.8 HIGH drm/pagemap: dma-unmap pages before handling migration errors
CVE-2026-97451 8.4 HIGH ACPICA: Fix integer overflow in acpi_ex_opcode_3A_1T_1R() (mid_op)
CVE-2026-97452 8.4 HIGH ACPICA: Prevent adding invalid references
CVE-2026-97455 8.4 HIGH ACPICA: Fix use-after-free in acpi_ds_terminate_control_method()
CVE-2026-97450 8.4 HIGH ACPICA: validate handler object type in two places
CVE-2026-93827 8.4 HIGH virtio-fs: avoid double-free on failed queue setup
CVE-2026-97433 8.2 HIGH nvme: validate FDP configuration descriptor sizes
CVE-2026-93221 8.1 HIGH nfsd: convert nfsd_net boolean flags to unsigned long flags word
CVE-2026-93786 8.1 HIGH ksmbd: preserve VFS inherited POSIX ACL mask

Showing top 20 of 234 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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