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Vulnerabilities

Vulnerability · CVE-2025-37924

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in kerberos authentication Setting sess->user = NULL was introduced to fix the danglin

Published May 20, 2025 · catalog updated Oct 15, 2026 · Linux Linux

Check this week

CVE-2025-37924 is not in CISA KEV. FIRST estimates a 22.05% chance of exploitation in the next 30 days. Check whether you run Linux Linux.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
22.05%
Remediation
Version ranges on file
Affected products
cpe debian/debian linux · cpe linux/linux kernel · vendor Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf <e86e9134e1d1c90a960dd57f59ce574d27b9a124

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in kerberos authentication Setting sess->user = NULL was introduced to fix the dangling pointer created by ksmbd_free_user. However, it is possible another thread could be operating on the session and make use of sess->user after it has been passed to ksmbd_free_user but before sess->user is set to NULL.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe debian/debian linux11.0
  • cpe linux/linux kernel6.15
  • vendor Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf <e86e9134e1d1c90a960dd57f59ce574d27b9a1240626e6641f6b467447c81dd7678a69c66f7746cf <e86e9134e1d1c90a960dd57f59ce574d27b9a124

How to fix CVE-2025-37924

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-37924 is not in CISA KEV. FIRST estimates a 22.05% chance of exploitation in the next 30 days. Check whether you run Linux Linux.

Which versions are affected?

Compare what you have installed with debian/debian linux 11.0; linux/linux kernel 6.15; Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf <e86e9134e1d1c90a960dd57f59ce574d27b9a124 0626e6641f6b467447c81dd7678a69c66f7746cf <e86e9134e1d1c90a960dd57f59ce574d27b9a124. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-416: Use After Free. EPSS 22.05%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 20, 2025 · NIST NVD

    Detected

    In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in kerberos authentication Setting sess->user = NULL was introduced to fix the dangling pointer created by ksmbd_free_user. However, it is possible another thread could be operating on the session and make use of sess->user after it has been passed to ksmbd_free_user but before sess->user is set to NULL.

  2. Oct 15, 2026 · NIST NVD

    Updated

    In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in kerberos authentication Setting sess->user = NULL was introduced to fix the dangling pointer created by ksmbd_free_user. However, it is possible another thread could be operating on the session and make use of sess->user after it has been passed to ksmbd_free_user but before sess->user is set to NULL.

Sources

  • CVE.orgVulnerability recordCVE-2025-37924

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-37924

    30-day exploitation probability 22.1%

    first.org
  • EUVDVulnerability recordEUVD-2025-15921

    In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in kerberos authentication Setting sess->user = NULL was introduced to fix the dangling pointer created by ksmbd_free_user. However, it is possible another thread could be operating on t

    euvd.enisa.europa.eu
  • NIST NVDVulnerability recordCVE-2025-37924

    In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in kerberos authentication Setting sess->user = NULL was introduced to fix the dangling pointer created by ksmbd_free_user. However, it is possible another thread could be operating on

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.