CVE-2026-31518
esp: fix skb leak with espintcp and async crypto
Description
In the Linux kernel, the following vulnerability has been resolved: esp: fix skb leak with espintcp and async crypto When the TX queue for espintcp is full, esp_output_tail_tcp will return an error and not free the skb, because with synchronous crypto, the common xfrm output code will drop the packet for us. With async crypto (esp_output_done), we need to drop the skb when esp_output_tail_tcp returns an error.
INFO
Published Date :
April 22, 2026, 2:16 p.m.
Last Modified :
April 22, 2026, 2:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Apply the kernel patch for espintcp skb leak.
- Ensure TX queue handling is robust.
- Verify async crypto operations.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-31518.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-31518 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-31518
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-31518 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-31518 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 22, 2026
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: esp: fix skb leak with espintcp and async crypto When the TX queue for espintcp is full, esp_output_tail_tcp will return an error and not free the skb, because with synchronous crypto, the common xfrm output code will drop the packet for us. With async crypto (esp_output_done), we need to drop the skb when esp_output_tail_tcp returns an error. Added Reference https://git.kernel.org/stable/c/0c0eef8ccd2413b0a10eb6bbd3442333b1e64dd2 Added Reference https://git.kernel.org/stable/c/41aafca57de4a4c026701622bd4648f112a9edcd Added Reference https://git.kernel.org/stable/c/4820847e036ff1035b01b69ad68dfc17e7028fe9 Added Reference https://git.kernel.org/stable/c/6a3ec6efbc4f90e0ccb2e71574f07351f19996f4 Added Reference https://git.kernel.org/stable/c/6aa9841d917532d0f2d932d1ff2f3a94305aaf47 Added Reference https://git.kernel.org/stable/c/88d386243ed374ac969dabd3bbc1409a31d81818 Added Reference https://git.kernel.org/stable/c/aca3ad0c262f54a5b5c95dda80a48365997d1224 Added Reference https://git.kernel.org/stable/c/df6f995358dc1f3c42484f5cfe241d7bd3e1cd15