Vulnerability 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.
CVSS Score
HIGH
References
- https://git.kernel.org/stable/c/0c716703965ffc5ef4311b65cb5d84a703784717
- https://git.kernel.org/stable/c/3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2
- https://git.kernel.org/stable/c/82f9028e83944a9eee5229cbc6fee9be1de8a62d
- https://git.kernel.org/stable/c/82fe78065450d2d07f36a22e2b6b44955cf5ca5b
- https://git.kernel.org/stable/c/946dec89c41726b94d31147ec528b96af0be1b5a
FAQ
What is CVE-2025-40292?
CVE-2025-40292 is a vulnerability with a CVSS score of 8.4 (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...
How severe is CVE-2025-40292?
CVE-2025-40292 has been rated HIGH with a CVSS base score of 8.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-40292?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.