CVE-2024-53176

Source
https://nvd.nist.gov/vuln/detail/CVE-2024-53176
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-53176.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2024-53176
Downstream
Related
Published
2024-12-27T13:49:20.518Z
Modified
2025-11-20T07:40:08.085523Z
Summary
smb: During unmount, ensure all cached dir instances drop their dentry
Details

In the Linux kernel, the following vulnerability has been resolved:

smb: During unmount, ensure all cached dir instances drop their dentry

The unmount process (cifskillsb() calling closeallcached_dirs()) can race with various cached directory operations, which ultimately results in dentries not being dropped and these kernel BUGs:

BUG: Dentry ffff88814f37e358{i=1000000000080,n=/} still in use (2) [unmount of cifs cifs] VFS: Busy inodes after unmount of cifs (cifs) ------------[ cut here ]------------ kernel BUG at fs/super.c:661!

This happens when a cfid is in the process of being cleaned up when, and has been removed from the cfids->entries list, including:

  • Receiving a lease break from the server
  • Server reconnection triggers invalidateallcached_dirs(), which removes all the cfids from the list
  • The laundromat thread decides to expire an old cfid.

To solve these problems, dropping the dentry is done in queued work done in a newly-added cfidputwq workqueue, and closeallcached_dirs() flushes that workqueue after it drops all the dentries of which it's aware. This is a global workqueue (rather than scoped to a mount), but the queued work is minimal.

The final cleanup work for cleaning up a cfid is performed via work queued in the serverclosewq workqueue; this is done separate from dropping the dentries so that closeallcacheddirs() doesn't block on any server operations.

Both of these queued works expect to invoked with a cfid reference and a tcon reference to avoid those objects from being freed while the work is ongoing.

While we're here, add proper locking to closeallcached_dirs(), and locking around the freeing of cfid->dentry.

References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
ebe98f1447bbccf8228335c62d86af02a0ed23f7
Fixed
73934e535cffbda1490fa97d82690a0f9aa73e94
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
ebe98f1447bbccf8228335c62d86af02a0ed23f7
Fixed
ff4528bbc82d0d90073751f7b49e7b9e9c7e5638
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
ebe98f1447bbccf8228335c62d86af02a0ed23f7
Fixed
548812afd96982a76a93ba76c0582ea670c40d9e
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
ebe98f1447bbccf8228335c62d86af02a0ed23f7
Fixed
3fa640d035e5ae526769615c35cb9ed4be6e3662

Affected versions

v6.*

v6.1
v6.1-rc1
v6.1-rc2
v6.1-rc3
v6.1-rc4
v6.1-rc5
v6.1-rc6
v6.1-rc7
v6.1-rc8
v6.10
v6.10-rc1
v6.10-rc2
v6.10-rc3
v6.10-rc4
v6.10-rc5
v6.10-rc6
v6.10-rc7
v6.11
v6.11-rc1
v6.11-rc2
v6.11-rc3
v6.11-rc4
v6.11-rc5
v6.11-rc6
v6.11-rc7
v6.11.1
v6.11.10
v6.11.2
v6.11.3
v6.11.4
v6.11.5
v6.11.6
v6.11.7
v6.11.8
v6.11.9
v6.12
v6.12-rc1
v6.12-rc2
v6.12-rc3
v6.12-rc4
v6.12-rc5
v6.12-rc6
v6.12-rc7
v6.12.1
v6.2
v6.2-rc1
v6.2-rc2
v6.2-rc3
v6.2-rc4
v6.2-rc5
v6.2-rc6
v6.2-rc7
v6.2-rc8
v6.3
v6.3-rc1
v6.3-rc2
v6.3-rc3
v6.3-rc4
v6.3-rc5
v6.3-rc6
v6.3-rc7
v6.4
v6.4-rc1
v6.4-rc2
v6.4-rc3
v6.4-rc4
v6.4-rc5
v6.4-rc6
v6.4-rc7
v6.5
v6.5-rc1
v6.5-rc2
v6.5-rc3
v6.5-rc4
v6.5-rc5
v6.5-rc6
v6.5-rc7
v6.6
v6.6-rc1
v6.6-rc2
v6.6-rc3
v6.6-rc4
v6.6-rc5
v6.6-rc6
v6.6-rc7
v6.6.1
v6.6.10
v6.6.11
v6.6.12
v6.6.13
v6.6.14
v6.6.15
v6.6.16
v6.6.17
v6.6.18
v6.6.19
v6.6.2
v6.6.20
v6.6.21
v6.6.22
v6.6.23
v6.6.24
v6.6.25
v6.6.26
v6.6.27
v6.6.28
v6.6.29
v6.6.3
v6.6.30
v6.6.31
v6.6.32
v6.6.33
v6.6.34
v6.6.35
v6.6.36
v6.6.37
v6.6.38
v6.6.39
v6.6.4
v6.6.40
v6.6.41
v6.6.42
v6.6.43
v6.6.44
v6.6.45
v6.6.46
v6.6.47
v6.6.48
v6.6.49
v6.6.5
v6.6.50
v6.6.51
v6.6.52
v6.6.53
v6.6.54
v6.6.55
v6.6.56
v6.6.57
v6.6.58
v6.6.59
v6.6.6
v6.6.60
v6.6.61
v6.6.62
v6.6.63
v6.6.7
v6.6.8
v6.6.9
v6.7
v6.7-rc1
v6.7-rc2
v6.7-rc3
v6.7-rc4
v6.7-rc5
v6.7-rc6
v6.7-rc7
v6.7-rc8
v6.8
v6.8-rc1
v6.8-rc2
v6.8-rc3
v6.8-rc4
v6.8-rc5
v6.8-rc6
v6.8-rc7
v6.9
v6.9-rc1
v6.9-rc2
v6.9-rc3
v6.9-rc4
v6.9-rc5
v6.9-rc6
v6.9-rc7

Database specific

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                "302118122446381099857850829324941660973",
                "183190293029342413543505653606339721584",
                "76966510283911405618880442718254819924",
                "274731752937831020891656279729733856439",
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                "338809520101329763625275100311436260777",
                "219867583740994990483758717033271825700",
                "199873216024686523269015161584524970992"
            ]
        },
        "id": "CVE-2024-53176-de7068fc",
        "signature_type": "Line",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@548812afd96982a76a93ba76c0582ea670c40d9e",
        "target": {
            "file": "fs/smb/client/cifsfs.c"
        }
    },
    {
        "deprecated": false,
        "signature_version": "v1",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
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                "163411538648121466815732240735964498472",
                "143702971463418540400635790136858988645",
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                "153906336341270084256987468216284402043",
                "51996496268675252878829981453309198528"
            ]
        },
        "id": "CVE-2024-53176-de89b900",
        "signature_type": "Line",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@73934e535cffbda1490fa97d82690a0f9aa73e94",
        "target": {
            "file": "fs/smb/client/trace.h"
        }
    },
    {
        "deprecated": false,
        "signature_version": "v1",
        "digest": {
            "length": 3956.0,
            "function_hash": "154180716976854206223857261307905657700"
        },
        "id": "CVE-2024-53176-e872c83b",
        "signature_type": "Function",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@73934e535cffbda1490fa97d82690a0f9aa73e94",
        "target": {
            "file": "fs/smb/client/cifsfs.c",
            "function": "init_cifs"
        }
    },
    {
        "deprecated": false,
        "signature_version": "v1",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
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                "181620316132353616569486281452790587577",
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                "212875874517741737568456371412973049486",
                "1244270181115039198160594390019474906",
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                "318341646243580123615632782330610046508",
                "323628397096213456894392351656963499264"
            ]
        },
        "id": "CVE-2024-53176-ef9bc2e1",
        "signature_type": "Line",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@73934e535cffbda1490fa97d82690a0f9aa73e94",
        "target": {
            "file": "fs/smb/client/cached_dir.c"
        }
    },
    {
        "deprecated": false,
        "signature_version": "v1",
        "digest": {
            "length": 475.0,
            "function_hash": "331461690911119993204900068152302909116"
        },
        "id": "CVE-2024-53176-f0228e42",
        "signature_type": "Function",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@ff4528bbc82d0d90073751f7b49e7b9e9c7e5638",
        "target": {
            "file": "fs/smb/client/cached_dir.c",
            "function": "close_all_cached_dirs"
        }
    }
]

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
6.1.0
Fixed
6.6.64
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.11.11
Type
ECOSYSTEM
Events
Introduced
6.12.0
Fixed
6.12.2