CVE-2025-40053

net: dlink: handle copy_thresh allocation failure

State: Published
Severity: 7.5 High
Published: Oct 28, 2025
Updated: Oct 15, 2026
Reserved: Apr 16, 2025

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

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 84fd710a704f3d53d4120e452e86cea558cf73a8Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 5aa9b885602811a026a3f45c92ea2b4b04c54f09Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 9d49e4b14609e1a20d931e718962c4b6b5485174Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before ea87151df398d407a632c7bf63013290f01c5009Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 7ed5010fef0930f4322d620052edc854ef3ec41fAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before fd7b6b2c920d7fd370a612be416a904d6e1ebe55Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 8169a6011c5fecc6cb1c3654c541c567d3318de8Affected
LinuxLinux	2.6.12Affected before 2.6.12Not affected 5.10.246 through 5.10.Not affected 5.15.195 through 5.15.Not affected 6.1.156 through 6.1.Not affected 6.6.112 through 6.6.Not affected 6.12.53 through 6.12.Not affected 6.17.3 through 6.17.Not affected 6.18 and laterNot affected

Product

Versions

LinuxLinux

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 84fd710a704f3d53d4120e452e86cea558cf73a8Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 5aa9b885602811a026a3f45c92ea2b4b04c54f09Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 9d49e4b14609e1a20d931e718962c4b6b5485174Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before ea87151df398d407a632c7bf63013290f01c5009Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 7ed5010fef0930f4322d620052edc854ef3ec41fAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before fd7b6b2c920d7fd370a612be416a904d6e1ebe55Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 8169a6011c5fecc6cb1c3654c541c567d3318de8Affected

LinuxLinux

2.6.12Affected
before 2.6.12Not affected
5.10.246 through 5.10.*Not affected
5.15.195 through 5.15.*Not affected
6.1.156 through 6.1.*Not affected
6.6.112 through 6.6.*Not affected
6.12.53 through 6.12.*Not affected
6.17.3 through 6.17.*Not affected
6.18 and laterNot affected

References

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