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CVE-2026-80855— fuse: fix invalidate lock leak on open O_TRUNC DAX failure

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fs/fuse/file.c中的fuse_open()函数在DAX截断路径中，当fuse_dax_break_layouts()因等待DAX页面排空过程被信号中断而失败时，未释放filemap_invalidate_lock()锁，造成rwsem锁泄漏，后续对该文件的fault或truncate操作可能停滞，导致拒绝服务。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 25

VendorProduct Version RangeStatus
Linux Linux d58366aab86854217b81679d1a9dcd54a2edfc2a< 1b04d80a27d317064cce2307472f5bef9975bc50 affected
2fdbb8dd01556e1501132b5ad3826e8f71e24a8b< a61524da59a2f5ac9c8de23ff98b30da769ab144 affected
2fdbb8dd01556e1501132b5ad3826e8f71e24a8b< dcf30a56624c2a0cfab1bada5b1ca8cc0c02f010 affected
2fdbb8dd01556e1501132b5ad3826e8f71e24a8b< 7288c279ddbd654a06c82118c1a3f5570c1807f0 affected
2fdbb8dd01556e1501132b5ad3826e8f71e24a8b< 776e85fda752f9a15e0f82dec42ecacd12a9bd94 affected
2fdbb8dd01556e1501132b5ad3826e8f71e24a8b< 1d3e701cda2f41d48aa721b3ebefbe0fbf8d74da affected
2fdbb8dd01556e1501132b5ad3826e8f71e24a8b< e981474d7bf1457da12404e169ea147d2c8ecea7 affected
2fdbb8dd01556e1501132b5ad3826e8f71e24a8b< a927f1867e61b78f39f9da0bbba3c98c2ca151fe affected
… +17 more rows
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I. Basic Information for CVE-2026-80855

Vulnerability Information
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Vulnerability Title
fuse: fix invalidate lock leak on open O_TRUNC DAX failure
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: fuse: fix invalidate lock leak on open O_TRUNC DAX failure fuse_open() takes filemap_invalidate_lock() for a DAX truncate (dax_truncate = true) and releases it before the out_inode_unlock label. But when fuse_dax_break_layouts() fails, the goto out_inode_unlock skips the unlock and leaks the rwsem, so any later fault or truncate on the file stalls on the stale lock. fuse_dax_break_layouts() can fail with -ERESTARTSYS when a signal interrupts the wait for busy DAX pages to drain: open("file", O_RDWR | O_TRUNC) └─ fuse_open() ├─ filemap_invalidate_lock() # dax_truncate └─ fuse_dax_break_layouts() └─ dax_break_layout() └─ wait_page_idle() # TASK_INTERRUPTIBLE └─ fuse_wait_dax_page() # unlock, schedule, re-lock └─ signal → -ERESTARTSYS goto out_inode_unlock # <- lock leaked Fix this by moving filemap_invalidate_unlock() below the label so that all error paths release the lock, and rename the label to out_unlock as it now covers more than just the inode lock.
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fs/fuse/file.c中的fuse_open()函数在DAX截断路径中，当fuse_dax_break_layouts()因等待DAX页面排空过程被信号中断而失败时，未释放filemap_invalidate_lock()锁，造成rwsem锁泄漏，后续对该文件的fault或truncate操作可能停滞，导致拒绝服务。
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 d58366aab86854217b81679d1a9dcd54a2edfc2a ~ 1b04d80a27d317064cce2307472f5bef9975bc50 -
Linux Linux 6.0 -

II. Public POCs for CVE-2026-80855

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III. Intelligence Information for CVE-2026-80855

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Patches & Fixes for CVE-2026-80855 (7)

Other References for CVE-2026-80855 (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-2026-80854 usb: gadget: f_tcm: keep port count until LUN teardown completes
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

V. Comments for CVE-2026-80855

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