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CVE-2026-80806— ext4: don't enable DAX on new encrypted files

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存在安全漏洞，该漏洞源于创建新的加密文件时，ext4_set_inode_flags函数在EXT4_INODE_ENCRYPT标志设置之前被调用，在文件系统以dax=always选项挂载时可能启用DAX，导致文件数据绕过加密，可能导致数据泄露。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1562

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 043546e46dc70c25ff7e2cf6d09cbb0424fc9978< add98959b220935b243170214c787bc03044a44d affected
043546e46dc70c25ff7e2cf6d09cbb0424fc9978< f53b325068bca0b238c3e0d2eb7de9b1f2268cab affected
043546e46dc70c25ff7e2cf6d09cbb0424fc9978< 5959cad3cfa852ec07bbdaf9c17f4838a94a8e6c affected
043546e46dc70c25ff7e2cf6d09cbb0424fc9978< a13f61ba9b2a7a4ff1f140949ccfad23c5313757 affected
043546e46dc70c25ff7e2cf6d09cbb0424fc9978< ed1cd834da65db127f1c30ff67e78f14825a06c1 affected
043546e46dc70c25ff7e2cf6d09cbb0424fc9978< 458776af0061afec1014cb3cd0061e282e482e83 affected
043546e46dc70c25ff7e2cf6d09cbb0424fc9978< 3392391b363a63ebb531d45318a729b1c998565b affected
043546e46dc70c25ff7e2cf6d09cbb0424fc9978< e27bae352158c007143d5bb50f3af33a177c0a37 affected
… +12 more rows
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I. Basic Information for CVE-2026-80806

Vulnerability Information
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Vulnerability Title
ext4: don't enable DAX on new encrypted files
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ext4: don't enable DAX on new encrypted files Currently, when a new encrypted regular file is created, the call to ext4_set_inode_flags(inode, init=true) in __ext4_new_inode() is made before EXT4_INODE_ENCRYPT is set. As a result, it can set S_DAX if the filesystem is mounted with "-o dax=always". EXT4_INODE_ENCRYPT then actually gets set a bit later in __ext4_new_inode(), when it calls fscrypt_set_context() which calls ext4_set_context(). ext4_set_context() sets EXT4_INODE_ENCRYPT and calls ext4_set_inode_flags(inode, init=false) to set S_ENCRYPTED too. This was intended to clear S_DAX as well. However, this was broken by commit 043546e46dc7 ("fs/ext4: Only change S_DAX on inode load"). This causes data written to the file to bypass encryption, also causing xfstests failures such as generic/548 (when "-o dax=always" is used). Fix this by simplifying the flow by making __ext4_new_inode() set EXT4_INODE_ENCRYPT earlier. This makes it take effect in ext4_set_inode_flags(inode, init=true), making S_DAX never be set. Similarly, make EXT4_STATE_MAY_INLINE_DATA never be set in the first place on new encrypted inodes. Then it doesn't need to be cleared. As a result of these simplifications, ext4_set_context() no longer needs to change inode flags or state when 'handle != NULL'. Remove that too.
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存在安全漏洞，该漏洞源于创建新的加密文件时，ext4_set_inode_flags函数在EXT4_INODE_ENCRYPT标志设置之前被调用，在文件系统以dax=always选项挂载时可能启用DAX，导致文件数据绕过加密，可能导致数据泄露。
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 043546e46dc70c25ff7e2cf6d09cbb0424fc9978 ~ add98959b220935b243170214c787bc03044a44d -
Linux Linux 5.8 -

II. Public POCs for CVE-2026-80806

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III. Intelligence Information for CVE-2026-80806

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Patches & Fixes for CVE-2026-80806 (7)

Vendor Advisories for CVE-2026-80806 (1)

Other References for CVE-2026-80806 (1)

Same Patch Batch · Linux · 2026-09-04 · 156 CVEs total

CVE-2026-80865 bpf: Add missing access_ok call to copy_user_syms
CVE-2026-80856 fuse: fix invalidate lock leak on setattr writeback failure
CVE-2026-80857 fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free
CVE-2026-80858 fuse: publish io-uring queues with release semantics
CVE-2026-80859 fuse: fix missing barrier when checking io-uring readiness
CVE-2026-80860 fuse: fix race between interrupt and resend
CVE-2026-80861 usb: xhci: bail out of setup if the controller is inaccessible
CVE-2026-80862 nvme-tcp: fix usage of page_frag_cache
CVE-2026-80863 RDMA/rxe: Fix OOB in free_rd_atomic_resources()
CVE-2026-80864 RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp
CVE-2026-80870 drm/amdkfd: Validate CRIU-restored IDs before idr_alloc
CVE-2026-80874 arm64: dts: renesas: ironhide: Describe inline ECC carveouts
CVE-2026-80873 KVM: arm64: nv: Write ESR_EL2 for injected nested SError exceptions
CVE-2026-80872 ALSA: hda/tas2781: Cancel async firmware request at unbind
CVE-2026-80871 crypto: xilinx-trng - Remove crypto_rng interface
CVE-2026-80868 ntfs3: Allocate iomap inline_data using alloc_page
CVE-2026-80866 tipc: avoid busy looping in tipc_exit_net()
CVE-2026-80867 alpha/PCI: Add security_locked_down() check to pci_mmap_resource()
CVE-2026-80855 fuse: fix invalidate lock leak on open O_TRUNC DAX failure
CVE-2026-80869 ntfs: bound the attribute-list entry in ntfs_read_inode_mount()

Showing top 20 of 156 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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