CVE-2026-23204

HIGH

In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_u32: use skb_header_pointer_careful() skb_header_pointer() does not fully validate negative @offset values. Use skb_header_pointer_careful() instead. GangMin Kim provided a report and a repro fooling u32_classify(): BUG: KASAN: slab-out-of-bounds in u32_classify+0x1180/0x11b0 net/sched/cls_u32.c:221

CVSS v3.1 Score

7.1
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
HIGH
Published: 2/14/2026Modified: 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 (9)

https://git.kernel.org/stable/c/13336a6239b9d7c6e61483017bb8bdfe3ceb10a5Patchhttps://git.kernel.org/stable/c/29681ed51e737be14d18ecd1c304c57002e4b72chttps://git.kernel.org/stable/c/66e4b63d61c15de6ca5332d9ca6db59a404d7136https://git.kernel.org/stable/c/8a672f177ebe19c93d795fbe967846084fbc7943Patchhttps://git.kernel.org/stable/c/cabd1a976375780dabab888784e356f574bbaed8Patchhttps://git.kernel.org/stable/c/cfa745830e45ecb75c061aa34330ee0cac941cc7https://git.kernel.org/stable/c/e41a23e61259f5526af875c3b86b3d42a9bae0e5Patchhttps://cert-portal.siemens.com/productcert/html/ssa-019113.htmlhttps://cert-portal.siemens.com/productcert/html/ssa-082556.html