What is CVE-2025-40292?

CVE-2025-40292 is a High severity Linux kernel vulnerability with a CVSS score of 8.4 out of 10, affecting Linux kernel versions from 6.1 onward and patched in 6.1.159, 6.6.117, 6.12.58 and others. CVE-2025-40292 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-40292?

CVE-2025-40292 has a CVSS score of 8.4 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2025-40292?

Yes, CVE-2025-40292 has been patched. Fixed versions include 6.1.159, 6.6.117, 6.12.58 and others. If you are running Linux kernel 6.1 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-40292 actively exploited?

CVE-2025-40292 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-40292

High

In the Linux kernel, the following vulnerability has been resolved: virtio-net: fix received length check in big packets Since commit 4959aebba8c0 ("virtio-net: use mtu size as buffer length for big packets"), when guest gso is off, the allocated size for big packets is not MAX_SKB_FRAGS * PAGE_SIZE anymore but depends on negotiated MTU. The number of allocated frags for big packets is stored in vi->big_packets_num_skbfrags. Because the host announced buffer length can be malicious (e.g. the host vhost_net driver's get_rx_bufs is modified to announce incorrect length), we need a check in virtio_net receive path. Currently, the check is not adapted to the new change which can lead to NULL page pointer dereference in the below while loop when receiving length that is larger than the allocated one. This commit fixes the received length check corresponding to the new change.

Package Linux Kernel

Published 2025-12-08

Last modified 2026-07-30

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

8.4

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected versions

Linux kernel versions 6.1 and later are affected. Fixed in 6.1.159, 6.6.117, 6.12.58, 6.17.8, 6.18 and their respective stable series.

Affected from

≥ 6.1

Fixed in

✓ 6.1.159 6.1.x ✓ 6.6.117 6.6.x ✓ 6.12.58 6.12.x ✓ 6.17.8 6.17.x ✓ 6.18

References

5 total

Details

CVE ID CVE-2025-40292

Severity High

CVSS score 8.4 / 10

CVSS version 3.1

Published 2025-12-08

Modified 2026-07-30

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-40292?

CVE-2025-40292 is a High severity Linux kernel vulnerability with a CVSS score of 8.4 out of 10 . It affects Linux kernel versions from 6.1 onward and has been patched in 6.1.159, 6.6.117, 6.12.58 and others. CVE-2025-40292 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-40292?

CVE-2025-40292 has a CVSS score of 8.4 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2025-40292?

Yes. CVE-2025-40292 has been patched. Fixed versions include 6.1.159, 6.6.117, 6.12.58 and others. If you are running Linux kernel 6.1 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-40292 actively exploited?

No. CVE-2025-40292 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.