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CVE-2023-54076

smb: client: fix missed ses refcounting

Critical9.8EPSS 0.46%
Published
Updated
Reserved
Assigned by
Linux

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.

Scores

CVSS scores of CVE-2023-54076, by who scored it
Scored byCVSSScoreVector
LinuxCNA (assigner)3.1Critical9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Deferred3.1Critical9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.46% · top 60% of all CVEs (6 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.

Affected products

  • Linux · Linux

    • affected 8e3554150d6c80a84b3cb046615d1a0e943811dc – < eb382196e6f6e05cfafdab797840e5a96c6e7bf0
    • affected 8e3554150d6c80a84b3cb046615d1a0e943811dc – < bf99f6be2d20146942bce6f9e90a0ceef12cbc1e
    • affected f30d226bcc9f0e2d97b4a6e94c43a28148fbeab6
    • affected c082c3be0f96e759ff2e361d929832fda0b93851
    • affected 6.2.15 – < 6.3
    • affected 6.3.2 – < 6.4

  • Linux · Linux

    • affected 6.4
    • unaffected < 6.4
    • unaffected 6.4.7 – ≤ 6.4.*
    • unaffected 6.5 – ≤ *

References (2)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .