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CVE-2026-80856— fuse: fix invalidate lock leak on setattr writeback 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fuse文件系统在setattr写回失败时未正确释放invalidate锁，可能导致后续对文件的故障或截断操作停滞，造成拒绝服务。

AI Predicted 4.3 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f< 8f14906ce9103ab8f2f1ebda45935a0d61b9d763 affected
6ae330cad6ef22ab8347ea9e0707dc56a7c7363f< 03cfeeb135428fa83f0791d3f8f94d9298cae695 affected
6ae330cad6ef22ab8347ea9e0707dc56a7c7363f< 92588d187ba4697a322e7aefe5d9e538a87d1cd2 affected
6ae330cad6ef22ab8347ea9e0707dc56a7c7363f< ea9fea370b8de4ffd72e0ef89550415c15637787 affected
6ae330cad6ef22ab8347ea9e0707dc56a7c7363f< 1758730d9eaa3c06cf415c3446d9f6eed9ed3eed affected
6ae330cad6ef22ab8347ea9e0707dc56a7c7363f< dd278d954c0e96a9cbd3cc491e07b8267d25f8d5 affected
6ae330cad6ef22ab8347ea9e0707dc56a7c7363f< e8457ebfd77a46e8d1210e8888ea914ad064558e affected
6ae330cad6ef22ab8347ea9e0707dc56a7c7363f< 9afeca0d569c9fc89d758fe7a9339d1e8afb1546 affected
… +10 more rows
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I. Basic Information for CVE-2026-80856

Vulnerability Information
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Vulnerability Title
fuse: fix invalidate lock leak on setattr writeback 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 setattr writeback failure fuse_do_setattr() takes filemap_invalidate_lock() for a DAX truncate (fault_blocked = true) and releases it at the out:/error: labels. But when a writeback flush is also needed, a write_inode_now() failure returns directly and leaks the lock, so any later fault or truncate on the file stalls on the stale rwsem. For example, truncate(2) on a setuid file reaches fuse_do_setattr() with both ATTR_SIZE and ATTR_MODE set: truncate(2) └─ do_truncate() ├─ dentry_needs_remove_privs() # S_ISUID └─ notify_change() # KILL_SUID -> ATTR_MODE └─ fuse_setattr() # no killpriv: │ # ia_valid |= ATTR_MODE └─ fuse_do_setattr() ├─ filemap_invalidate_lock() # IS_DAX && is_truncate └─ write_inode_now() # is_wb && ATTR_MODE └─ if (err) # e.g. daemon -> -EIO return err # <- lock leaked Fix this by adding an unlock label that releases the lock before returning the error, and use it for the fuse_dax_break_layouts() failure path as well.
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fuse文件系统在setattr写回失败时未正确释放invalidate锁，可能导致后续对文件的故障或截断操作停滞，造成拒绝服务。
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 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f ~ 8f14906ce9103ab8f2f1ebda45935a0d61b9d763 -
Linux Linux 5.10 -

II. Public POCs for CVE-2026-80856

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III. Intelligence Information for CVE-2026-80856

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Patches & Fixes for CVE-2026-80856 (8)

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

CVE-2026-80865 bpf: Add missing access_ok call to copy_user_syms
CVE-2026-80855 fuse: fix invalidate lock leak on open O_TRUNC DAX 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-2026-80856

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