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CVE-2026-53381— virtiofs: fix UAF on submount umount

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存在安全漏洞，该漏洞源于释放后重用，可能导致在超级块已销毁时iput()函数引发异常。

CVSS 7.8 · High EPSS 0.14% · P4

Possible ATT&CK Techniques 1 AI

T1205 · Traffic Signaling

Affected Version Matrix 27

VendorProduct Version RangeStatus
Linux Linux 548e1f2bac1d4df91a6138f26bb4ab00323fd948< 607a1d4c42f649e6197567c0448fd9ebb316cd42 affected
cfd1aa3e2b71f3327cb373c45a897c9028c62b35< 1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e affected
83b375c6efef69b1066ad2d79601221e7892745a< 0b809199ff87c44487e516a725dd4be2185712ce affected
bfd17b6138df0122a95989457d8e18ce0b86165e< 2181a09ba980f142650fb053666350ead4471cfe affected
b26923512dbe57ae4917bafd31396d22a9d1691a< 97c4691653d145dcc699eca5d3aba3219a520f1f affected
26e5c67deb2e1f42a951f022fdf5b9f7eb747b01< 2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9 affected
26e5c67deb2e1f42a951f022fdf5b9f7eb747b01< 39a2b95e008665c14f84e50ed411d898df7cd11b affected
26e5c67deb2e1f42a951f022fdf5b9f7eb747b01< e09412a714bcd49375198427bb4aa005037a9d6f affected
… +19 more rows
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I. Basic Information for CVE-2026-53381

Vulnerability Information
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Vulnerability Title
virtiofs: fix UAF on submount umount
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: virtiofs: fix UAF on submount umount iput() called from fuse_release_end() can Oops if the super block has already been destroyed. Normally this is prevented by waiting for num_waiting to go down to zero before commencing with super block shutdown. This only works, however, for the last submount instance, as the wait counter is per connection, not per superblock. Revert to using synchronous release requests for the auto_submounts case, which is virtiofs only at this time.
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存在安全漏洞，该漏洞源于释放后重用，可能导致在超级块已销毁时iput()函数引发异常。
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 548e1f2bac1d4df91a6138f26bb4ab00323fd948 ~ 607a1d4c42f649e6197567c0448fd9ebb316cd42 -
Linux Linux 6.18 -

II. Public POCs for CVE-2026-53381

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III. Intelligence Information for CVE-2026-53381

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Patches & Fixes for CVE-2026-53381 (7)

Same Patch Batch · Linux · 2026-07-19 · 429 CVEs total

CVE-2026-63795 10.0 CRITICAL 9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-64091 9.8 CRITICAL batman-adv: tt: fix TOCTOU race for reported vlans
CVE-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-63922 9.8 CRITICAL ipv6: exthdrs: refresh nh after handling HAO option
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-64056 9.8 CRITICAL net: ethernet: cortina: Make RX SKB per-port
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-63978 9.8 CRITICAL net/handshake: Drain pending requests at net namespace exit
CVE-2026-64055 9.8 CRITICAL net: ethernet: cortina: Carry over frag counter
CVE-2026-63808 9.8 CRITICAL exfat: fix potential use-after-free in exfat_find_dir_entry()
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-63888 9.8 CRITICAL scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
CVE-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
CVE-2026-64113 9.8 CRITICAL ixgbevf: fix use-after-free in VEPA multicast source pruning
CVE-2026-63825 9.8 CRITICAL gcov: use atomic counter updates to fix concurrent access crashes
CVE-2026-63857 9.8 CRITICAL net: airoha: Do not read uninitialized fragment address in airoha_dev_xmit()
CVE-2026-64160 9.8 CRITICAL netfs: Fix potential for tearing in ->remote_i_size and ->zero_point
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-63924 9.8 CRITICAL ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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