CVE-2025-40053
Published Oct 28, 2025
Modified Apr 15, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: net: dlink: handle copy_thresh allocation failure The driver did not handle failure of `netdev_alloc_skb_ip_align()`. If the allocation failed, dereferencing `skb->protocol` could lead to a NULL pointer dereference. This patch tries to allocate `skb`. If the allocation fails, it falls back to the normal path. Tested-on: D-Link DGE-550T Rev-A3
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References
Other References
https://git.kernel.org/stable/c/5aa9b885602811a026a3f45c92ea2b4b04c54f09
https://git.kernel.org/stable/c/7ed5010fef0930f4322d620052edc854ef3ec41f
https://git.kernel.org/stable/c/8169a6011c5fecc6cb1c3654c541c567d3318de8
https://git.kernel.org/stable/c/84fd710a704f3d53d4120e452e86cea558cf73a8
https://git.kernel.org/stable/c/9d49e4b14609e1a20d931e718962c4b6b5485174
https://git.kernel.org/stable/c/ea87151df398d407a632c7bf63013290f01c5009
https://git.kernel.org/stable/c/fd7b6b2c920d7fd370a612be416a904d6e1ebe55
Frequently Asked Questions
What is CVE-2025-40053? +
In the Linux kernel, the following vulnerability has been resolved:
net: dlink: handle copy_thresh allocation failure
The driver did not handle failure of `netdev_alloc_skb_ip_align()`.
If the allocation failed, dereferencing `skb->protocol` could lead to
a NULL pointer dereference.
This patch tries to allocate `skb`. If the allocation fails, it falls
back to the normal path.
Tested-on: D-Link DGE-550T Rev-A3
How do I check if I'm vulnerable to CVE-2025-40053? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.