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CVE-2025-37879

Linux Kernel out-of-bounds read

9.8 CRITICALEPSS 0.72%
  1. Published9 May 2025

Description

In the Linux kernel, the following vulnerability has been resolved: 9p/net: fix improper handling of bogus negative read/write replies In p9_client_write() and p9_client_read_once(), if the server incorrectly replies with success but a negative write/read count then we would consider written (negative) <= rsize (positive) because both variables were signed. Make variables unsigned to avoid this problem. The reproducer linked below now fails with the following error instead of a null pointer deref: 9pnet: bogus RWRITE count (4294967295 > 3)

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≥ 6.13 < 6.14.5 · ≥ 6.2 < 6.6.89 · ≥ 6.7 < 6.12.26 · < 6.1.136

Remediation

Fixed in
Linux Kernel≥ 6.14.5

References

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Frequently asked

Is CVE-2025-37879 being actively exploited?

CVE-2025-37879 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.72%.

How severe is CVE-2025-37879?

CVE-2025-37879 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.72% probability of exploitation.

Which products are affected by CVE-2025-37879?

Affected products include Debian Linux, Linux Kernel.

How do I fix CVE-2025-37879?

Upgrade affected software to a fixed version, for example Linux Kernel 6.14.5 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.