Critical severity · published Dec 24, 2025
CVE-2023-54076
smb: client: fix missed ses refcounting
9.8
CVSS
0.5%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix missed ses refcounting
Use new cifs_smb_ses_inc_refcount() helper to get an active reference
of @ses and @ses->dfs_root_ses (if set). This will prevent
@ses->dfs_root_ses of being put in the next call to cifs_put_smb_ses()
and thus potentially causing an use-after-free bug.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 39% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
Linux · Linux
8e3554150d6c80a84b3cb046615d1a0e943811dc before eb382196e6f6e05cfafdab797840e5a96c6e7bf0; 8e3554150d6c80a84b3cb046615d1a0e943811dc before bf99f6be2d20146942bce6f9e90a0ceef12cbc1e; f30d226bcc9f0e2d97b4a6e94c43a28148fbeab6; c082c3be0f96e759ff2e361d929832fda0b93851; 6.2.15 before 6.3; 6.3.2 before 6.4; +1 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-54076
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-54076
git.kernel.org
https://git.kernel.org/stable/c/bf99f6be2d20146942bce6f9e90a0ceef12cbc1e
git.kernel.org
https://git.kernel.org/stable/c/eb382196e6f6e05cfafdab797840e5a96c6e7bf0
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