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Vulnerabilities CVE-2026-43190

CVE-2026-43190

High
Open
TLP:CLEAR

netfilter: xt_tcpmss: check remaining length before reading optlen

NVD CVE.org
Critical Infrastructure

AI Analysis

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Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_tcpmss: check remaining length before reading optlen Quoting reporter: In net/netfilter/xt_tcpmss.c (lines 53-68), the TCP option parser reads op[i+1] directly without validating the remaining option length. If the last byte of the option field is not EOL/NOP (0/1), the code attempts to index op[i+1]. In the case where i + 1 == optlen, this causes an out-of-bounds read, accessing memory past the optlen boundary (either reading beyond the stack buffer _opt or the following payload).

Details

CVSS Score
8.2
EPSS Score
0.46%

38th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Confidence
90%
Published
May 6, 2026
Last Modified
Aug 5, 2026
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