CVE-2026-31518

MEDIUM

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.

CVSS v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Published: 4/22/2026Modified: 7/14/2026

Related Intelligence (1)

CRITICALAi

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP

<p><a href="https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-209-04.json"><strong>View CSAF</strong></a></p> <h2>Summary</h2> <p><strong>Multiple vulnerabilities have been identified in the additional GNU/Linux subsystem of the firmware version V3.1.6 for the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP (incl. SIPLUS variant). Siemens is preparing fix versions and recommend

CVE-2021-41617CVE-2023-28531
CISA Advisories

References (10)

https://git.kernel.org/stable/c/0c0eef8ccd2413b0a10eb6bbd3442333b1e64dd2Patchhttps://git.kernel.org/stable/c/41aafca57de4a4c026701622bd4648f112a9edcdPatchhttps://git.kernel.org/stable/c/4820847e036ff1035b01b69ad68dfc17e7028fe9Patchhttps://git.kernel.org/stable/c/6a3ec6efbc4f90e0ccb2e71574f07351f19996f4Patchhttps://git.kernel.org/stable/c/6aa9841d917532d0f2d932d1ff2f3a94305aaf47Patchhttps://git.kernel.org/stable/c/88d386243ed374ac969dabd3bbc1409a31d81818Patchhttps://git.kernel.org/stable/c/aca3ad0c262f54a5b5c95dda80a48365997d1224Patchhttps://git.kernel.org/stable/c/df6f995358dc1f3c42484f5cfe241d7bd3e1cd15Patchhttps://cert-portal.siemens.com/productcert/html/ssa-019113.htmlhttps://cert-portal.siemens.com/productcert/html/ssa-082556.html