Review reviewCritical

CVE-2023-54076

Linux

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
9.8
EPSS
0.39%
32.2% percentile
CISA KEV
Not listed
Published
2025.12.24
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.39%
Technical severityCVSS 9.8

Vulnerability overview

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.

Affected product and versions

Product
Linux
Affected versions
>= 8e3554150d6c80a84b3cb046615d1a0e943811dc < eb382196e6f6e05cfafdab797840e5a96c6e7bf0, >= 8e3554150d6c80a84b3cb046615d1a0e943811dc < bf99f6be2d20146942bce6f9e90a0ceef12cbc1e, >= f30d226bcc9f0e2d97b4a6e94c43a28148fbeab6, >= c082c3be0f96e759ff2e361d929832fda0b93851, >= 6.2.15 < 6.3, >= 6.3.2 < 6.4, >= 6.4
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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2023-54076 — Linux | SECUFOCUS NOW