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CVE-2026-80857— fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free

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的request_wait_answer()函数在abort_on_kill路径调用fuse_abort_conn()后未等待FR_FINISHED，若fuse_dev_do_write()并发处理同一请求，调用方释放仍被访问的req->args，导致释放后重用。

AI Predicted 7.8 Difficulty: Hard EPSS 0.15% · P5

Possible ATT&CK Techniques 1 AI

T1657 · Financial Theft

Affected Version Matrix 11

VendorProduct Version RangeStatus
Linux Linux 0c7fca880a40a209a9c92be14143996d14b93ff6< a8bbb2a60513bf322170903c21462f0bf4f62be2 affected
204aa22a686bfee48daca7db620c1e017615f2ff< 715cb86e33cda43f5224cdc3fd5610c0b6a46f7a affected
204aa22a686bfee48daca7db620c1e017615f2ff< 64b0b5cacbd2fea88001464cb712c9dfc795b26e affected
300e812b882a174dca675d8028684001ad5826bc affected
6.18.25< 6.18.50 affected
7.0.2< 7.1 affected
7.1 affected
< 7.1 unaffected
… +3 more rows
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I. Basic Information for CVE-2026-80857

Vulnerability Information
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Vulnerability Title
fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free The abort_on_kill path in request_wait_answer() calls fuse_abort_conn() and returns without waiting for FR_FINISHED. If fuse_dev_do_write() is concurrently processing the same request (FR_LOCKED set), the caller frees req->args while it is still being accessed, causing a use-after-free. Fix this by jumping to the existing wait_event(FR_FINISHED) instead of returning early. The wait will not hang because fuse_abort_conn() ensures all requests are ended.
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的request_wait_answer()函数在abort_on_kill路径调用fuse_abort_conn()后未等待FR_FINISHED，若fuse_dev_do_write()并发处理同一请求，调用方释放仍被访问的req->args，导致释放后重用。
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 0c7fca880a40a209a9c92be14143996d14b93ff6 ~ a8bbb2a60513bf322170903c21462f0bf4f62be2 -
Linux Linux 7.1 -

II. Public POCs for CVE-2026-80857

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III. Intelligence Information for CVE-2026-80857

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Patches & Fixes for CVE-2026-80857 (3)

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-2026-80856 fuse: fix invalidate lock leak on setattr writeback failure
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-2026-80857

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