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CVE-2025-37778

Linux Kernel use-after-free

9.8 CRITICALEPSS 1.14%
  1. Published1 May 2025

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: Fix dangling pointer in krb_authenticate krb_authenticate frees sess->user and does not set the pointer to NULL. It calls ksmbd_krb5_authenticate to reinitialise sess->user but that function may return without doing so. If that happens then smb2_sess_setup, which calls krb_authenticate, will be accessing free'd memory when it later uses sess->user.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Debian Linux11.0
Linux Kernel≥ 5.15 < 6.1.135 · ≥ 6.13 < 6.14.4 · ≥ 6.2 < 6.6.88 · ≥ 6.7 < 6.12.25

Remediation

Fixed in
Linux Kernel≥ 6.1.135

References

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Frequently asked

Is CVE-2025-37778 being actively exploited?

CVE-2025-37778 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.14%.

How severe is CVE-2025-37778?

CVE-2025-37778 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 1.14% probability of exploitation.

Which products are affected by CVE-2025-37778?

Affected products include Debian Linux, Linux Kernel.

How do I fix CVE-2025-37778?

Upgrade affected software to a fixed version, for example Linux Kernel 6.1.135 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-37778 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.