PT-2025-49425 · Linux+3 · Linux Kernel+3
Published
2025-12-08
·
Updated
2026-05-07
·
CVE-2025-40292
CVSS v2.0
4.3
Medium
| Vector | AV:L/AC:L/Au:M/C:N/I:N/A:C |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
A flaw exists in the virtio-net component of the Linux kernel related to the handling of received packet lengths in large packets. A change introduced by commit 4959aebba8c0 altered how buffer sizes are allocated for large packets, basing them on the negotiated MTU rather than a fixed size. This introduced a potential for a NULL page pointer dereference during packet reception if a malicious host announces an incorrect buffer length. The issue arises because the length check in the receive path was not updated to reflect the new buffer size calculation. This could occur when receiving packets larger than the allocated buffer.
Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
NULL Pointer Dereference
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Weakness Enumeration
Related Identifiers
Affected Products
Debian
Linuxmint
Linux Kernel
Ubuntu