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CVE-2025-21748

Linux Kernel integer overflow

9.8 CRITICALEPSS 0.61%
  1. Published27 Feb 2025

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix integer overflows on 32 bit systems On 32bit systems the addition operations in ipc_msg_alloc() can potentially overflow leading to memory corruption. Add bounds checking using KSMBD_IPC_MAX_PAYLOAD to avoid overflow.

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≥ 5.15 < 6.1.129 · ≥ 6.13 < 6.13.3 · ≥ 6.2 < 6.6.78 · ≥ 6.7 < 6.12.14

Remediation

Fixed in
Linux Kernel≥ 6.1.129

References

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Frequently asked

Is CVE-2025-21748 being actively exploited?

CVE-2025-21748 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.61%.

How severe is CVE-2025-21748?

CVE-2025-21748 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.61% probability of exploitation.

Which products are affected by CVE-2025-21748?

Affected products include Linux Kernel.

How do I fix CVE-2025-21748?

Upgrade affected software to a fixed version, for example Linux Kernel 6.1.129 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-21748 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.