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CVE-2026-64266— fuse: re-lock request before returning from fuse_ref_folio()

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基金会开源的一款操作系统内核。 Linux kernel 2.6.35版本存在安全漏洞，该漏洞源于fuse_ref_folio()在返回前未重新锁定请求，可能导致释放后重用问题。

CVSS 7.8 · High EPSS 0.16% · P6

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c3021629a0d820247ee12b6c5192a1d5380e21c6< 1f9156714592356b4fda57beac7eab9c2a462dd3 affected
c3021629a0d820247ee12b6c5192a1d5380e21c6< 5630da218a45ba80f0aba0846cbe8aa655da122b affected
c3021629a0d820247ee12b6c5192a1d5380e21c6< 1ca605cfa59377f0143fb35b5b01360f37d1b7c4 affected
c3021629a0d820247ee12b6c5192a1d5380e21c6< 0e4a5a000123d81234e27a2f8187688cf608f755 affected
c3021629a0d820247ee12b6c5192a1d5380e21c6< e6aa539720c3d8def69683ed0c07cf9faea4e8be affected
c3021629a0d820247ee12b6c5192a1d5380e21c6< be353caffa8640f5e25fb3714ce8b0cef5e410e5 affected
c3021629a0d820247ee12b6c5192a1d5380e21c6< 65a1c2551f7e16085acbb54aedde1feaa559ba7a affected
c3021629a0d820247ee12b6c5192a1d5380e21c6< b5befa80fdbe287a98480effed9564712924add5 affected
… +10 more rows
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I. Basic Information for CVE-2026-64266

Vulnerability Information
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Vulnerability Title
fuse: re-lock request before returning from fuse_ref_folio()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: fuse: re-lock request before returning from fuse_ref_folio() fuse_ref_folio() unlocks the request but does not re-lock it before returning. fuse_chan_abort() can end the request and the async end callback (eg fuse_writepage_free()) can free the args while the subsequent copy chain logic after fuse_ref_folio() accesses them, leading to use-after-free issues. Fix this by locking the request in fuse_ref_folio() before returning.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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基金会开源的一款操作系统内核。 Linux kernel 2.6.35版本存在安全漏洞，该漏洞源于fuse_ref_folio()在返回前未重新锁定请求，可能导致释放后重用问题。
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 c3021629a0d820247ee12b6c5192a1d5380e21c6 ~ 1f9156714592356b4fda57beac7eab9c2a462dd3 -
Linux Linux 2.6.35 -

II. Public POCs for CVE-2026-64266

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III. Intelligence Information for CVE-2026-64266

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Patches & Fixes for CVE-2026-64266 (8)

Same Patch Batch · Linux · 2026-07-25 · 274 CVEs total

CVE-2026-64355 9.8 CRITICAL bpf: Reject fragmented frames in devmap
CVE-2026-64459 9.8 CRITICAL tcp: restore RCU grace period in tcp_ao_destroy_sock
CVE-2026-64303 9.8 CRITICAL spi: fsl-lpspi: terminate the RX channel on TX prepare failure path
CVE-2026-64439 9.8 CRITICAL crypto: krb5 - filter out async aead implementations at alloc
CVE-2026-64410 9.8 CRITICAL netfilter: flowtable: IPIP tunnel hardware offload is not yet support
CVE-2026-64399 9.8 CRITICAL ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE
CVE-2026-64397 9.8 CRITICAL ksmbd: serialize QUERY_DIRECTORY requests per file
CVE-2026-64391 9.8 CRITICAL ksmbd: use opener credentials for ADS I/O
CVE-2026-64387 9.8 CRITICAL smb: client: fix query directory replay double-free
CVE-2026-64386 9.8 CRITICAL smb: client: fix query_info() replay double-free
CVE-2026-64385 9.8 CRITICAL smb: client: fix double-free in SMB2_ioctl() replay
CVE-2026-64383 9.8 CRITICAL smb: client: fix double-free in SMB2_flush() replay
CVE-2026-64384 9.8 CRITICAL smb: client: fix change notify replay double-free
CVE-2026-64268 9.8 CRITICAL RDMA/siw: bound Read Response placement to the RREAD length
CVE-2026-64523 9.8 CRITICAL net/handshake: Take a long-lived file reference at submit
CVE-2026-64257 9.1 CRITICAL smb: client: reject overlapping data areas in SMB2 responses
CVE-2026-64392 9.1 CRITICAL ksmbd: use opener credentials for delete-on-close
CVE-2026-64393 9.1 CRITICAL ksmbd: run set info with opener credentials
CVE-2026-64269 9.1 CRITICAL RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
CVE-2026-64319 9.1 CRITICAL nvmet-auth: validate reply message payload bounds against transfer length

Showing top 20 of 274 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64266

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