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CVE-2025-21927

Linux Kernel buffer overflow

9.8 CRITICALEPSS 0.50%
  1. Published1 Apr 2025

Description

In the Linux kernel, the following vulnerability has been resolved: nvme-tcp: fix potential memory corruption in nvme_tcp_recv_pdu() nvme_tcp_recv_pdu() doesn't check the validity of the header length. When header digests are enabled, a target might send a packet with an invalid header length (e.g. 255), causing nvme_tcp_verify_hdgst() to access memory outside the allocated area and cause memory corruptions by overwriting it with the calculated digest. Fix this by rejecting packets with an unexpected header length.

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

Linux Kernel≥ 5.0 < 6.12.19 · ≥ 6.13 < 6.13.7 · 6.14

Remediation

Fixed in
Linux Kernel≥ 6.12.19

References

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Frequently asked

Is CVE-2025-21927 being actively exploited?

CVE-2025-21927 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.50%.

How severe is CVE-2025-21927?

CVE-2025-21927 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.50% probability of exploitation.

Which products are affected by CVE-2025-21927?

Affected products include Linux Kernel.

How do I fix CVE-2025-21927?

Upgrade affected software to a fixed version, for example Linux Kernel 6.12.19 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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