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Review reviewHigh

CVE-2026-64108

Linux

In the Linux kernel, the following vulnerability has been resolved: cifs: Fix busy dentry used after unmounting Since commit 340cea84f691c ("cifs: open files should not hold ref on superblock"), cifs file only holds the dentry ref_cnt, the cifs file close work(cfile->deferred) could be executed after unmounting, which will trigger a warning in generic_shutdown_super: BUG: Dentry 00000000a14a6845{i=c,n=file} still in use (1) [unmount of cifs cifs] The detailed processs is: process A process B kworker fd = open(PATH) vfs_open file->__f_path = *path // dentry->d_lockref.count = 1 cifs_open cif...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: cifs: Fix busy dentry used after unmounting Since commit 340cea84f691c ("cifs: open files should not hold ref on superblock"), cifs file only holds the dentry ref_cnt, the cifs file close work(cfile->deferred) could be executed after unmounting, which will trigger a warning in generic_shutdown_super: BUG: Dentry 00000000a14a6845{i=c,n=file} still in use (1) [unmount of cifs cifs] The detailed processs is: process A process B kworker fd = open(PATH) vfs_open file->__f_path = *path // dentry->d_lockref.count = 1 cifs_open cif...

Affected product and versions

Product
Linux
Affected versions
>= 708c276f516d27beaded7f372ac8111cee43926c < c7364cea52531534676b9f7dbc0a477c11f4c050, >= 0629a1a187e424373364d681b42b101894bdb548 < bdc349a87f1fb02c18c4071858a06542bfea783d, >= 0e4b8faaaebe3137bec5723ef2b3cb0437fb38fd < f2deaa2f409a4598eaa10f2a93a676c0632af248, >= f655467a9973f964b267871e5fef533ad5014494 < 5e7d9d0805e58fa3760894e73115b7a74024fd07, >= 340cea84f691c5206561bb2e0147158fe02070be < e1ffa6cf662383f95816eed1b623429d82675e75, >= 340cea84f691c5206561bb2e0147158fe02070be < c68337442f03953237a94577beb468ab2662a851, >= 30afc6ea72cc6cf7c8d579e79b64232801c38d08, >= 6.1.167 < 6.1.175, >= 6.6.130 < 6.6.142, >= 6.12.78 < 6.12.92, >= 6.18.20 < 6.18.34, >= 6.19.10 < 6.20, >= 7.0
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2026-64108 — Linux | SECUFOCUS NOW