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Vulnerabilities

Vulnerability · CVE-2025-38708

In the Linux kernel, the following vulnerability has been resolved: drbd: add missing kref_get in handle_write_conflicts With enabled, DRBD tries to detect "concurrent" writes and

Published Sep 4, 2025 · catalog updated Oct 19, 2026 · Linux Linux

Check this week

CVE-2025-38708 is not in CISA KEV. FIRST estimates a 38.00% 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
38.00%
Remediation
Version ranges on file
Affected products
cpe debian/debian linux · cpe linux/linux kernel · vendor Linux Linux 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 <00c9c9628b49e368d140cfa61d7df9b8922ec2a8

In the Linux kernel, the following vulnerability has been resolved: drbd: add missing kref_get in handle_write_conflicts With enabled, DRBD tries to detect "concurrent" writes and handle write conflicts, so that even if you write to the same sector simultaneously on both nodes, they end up with the identical data once the writes are completed. In handling "superseeded" writes, we forgot a kref_get, resulting in a premature drbd_destroy_device and use after free, and further to kernel crashes with symptoms. Relevance: No one should use DRBD as a random data generator, and apparently all users of "two-primaries" handle concurrent writes correctly on layer up. That is cluster file systems use some distributed lock manager, and live migration in virtualization environments stops writes on one node before starting writes on the other node. Which means that other than for "test cases", this code path is never taken in real life. FYI, in DRBD 9, things are handled differently nowadays. We still detect "write conflicts", but no longer try to be smart about them. We decided to disconnect hard instead: upper layers must not submit concurrent writes. If they do, that's their fault.

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 kernelversion unspecified
  • vendor Linux Linux 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 <00c9c9628b49e368d140cfa61d7df9b8922ec2a8668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 <00c9c9628b49e368d140cfa61d7df9b8922ec2a8

How to fix CVE-2025-38708

What to do

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

Should you patch?

CVE-2025-38708 is not in CISA KEV. FIRST estimates a 38.00% 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 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 <00c9c9628b49e368d140cfa61d7df9b8922ec2a8 668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 <00c9c9628b49e368d140cfa61d7df9b8922ec2a8. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-416: Use After Free. EPSS 38.00%. 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. Sep 4, 2025 · NIST NVD

    Detected

    In the Linux kernel, the following vulnerability has been resolved: drbd: add missing kref_get in handle_write_conflicts With enabled, DRBD tries to detect "concurrent" writes and handle write conflicts, so that even if you write to the same sector simultaneously on both nodes, they end up with the identical data once the writes are completed. In handling "superseeded" writes, we forgot a kref_get

  2. Oct 19, 2026 · NIST NVD

    Updated

    In the Linux kernel, the following vulnerability has been resolved: drbd: add missing kref_get in handle_write_conflicts With enabled, DRBD tries to detect "concurrent" writes and handle write conflicts, so that even if you write to the same sector simultaneously on both nodes, they end up with the identical data once the writes are completed. In handling "superseeded" writes, we forgot a kref_get

Sources

  • CVE.orgVulnerability recordCVE-2025-38708

    Official CVE identifier

    cve.org
  • EUVDVulnerability recordEUVD-2025-26761

    In the Linux kernel, the following vulnerability has been resolved: drbd: add missing kref_get in handle_write_conflicts With enabled, DRBD tries to detect "concurrent" writes and handle write conflicts, so that even if you write to the same sector simultaneously on both nodes, t

    euvd.enisa.europa.eu
  • NIST NVDVulnerability recordCVE-2025-38708

    In the Linux kernel, the following vulnerability has been resolved: drbd: add missing kref_get in handle_write_conflicts With enabled, DRBD tries to detect "concurrent" writes and handle write conflicts, so that even if you write to the same sector simultaneousl

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 19, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.