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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/0c716703965ffc5ef4311b65cb5d84a703784717 cve-icon cve-icon
https://git.kernel.org/stable/c/3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2 cve-icon cve-icon
https://git.kernel.org/stable/c/82f9028e83944a9eee5229cbc6fee9be1de8a62d cve-icon cve-icon
https://git.kernel.org/stable/c/82fe78065450d2d07f36a22e2b6b44955cf5ca5b cve-icon cve-icon
https://git.kernel.org/stable/c/946dec89c41726b94d31147ec528b96af0be1b5a cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025120818-CVE-2025-40292-e613@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-40292 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-40292 cve-icon
History

Tue, 09 Dec 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Moderate

Mon, 08 Dec 2025 01:15:00 +0000

Type Values Removed Values Added
Description 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.
Title virtio-net: fix received length check in big packets
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-12-08T00:46:15.761Z

Updated: 2025-12-08T00:46:15.761Z

Reserved: 2025-04-16T07:20:57.185Z

Link: CVE-2025-40292

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-12-08T01:16:01.160

Modified: 2025-12-08T18:26:49.133

Link: CVE-2025-40292

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-12-08T00:00:00Z

Links: CVE-2025-40292 - Bugzilla