CVE-2025-40292
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-08

Last updated on: 2025-12-08

Assigner: kernel.org

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.
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Meta Information
Published
2025-12-08
Last Modified
2025-12-08
Generated
2026-05-07
AI Q&A
2025-12-08
EPSS Evaluated
2026-05-05
NVD
CVE-2025-40292
EUVD
EUVD-2025-201652
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability is in the Linux kernel's virtio-net component. It involves an incorrect length check for received big packets when guest GSO (Generic Segmentation Offload) is off. Due to a change in how buffer sizes are allocated based on negotiated MTU instead of a fixed size, the existing length check was not updated accordingly. This can lead to a NULL page pointer dereference when the received packet length is larger than the allocated buffer, potentially causing a crash or denial of service.


How can this vulnerability impact me? :

The vulnerability can cause a NULL page pointer dereference in the Linux kernel's virtio-net receive path, which may lead to a system crash or denial of service. This can disrupt network functionality on affected systems using virtio-net, impacting availability.


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