CVE-2026-43190

HIGH EPSS 36.7%
Published May 6, 20261mo ago · Modified Jun 17, 20261w ago
8.2 CVSS 3.1
High
Find Similar
Published May 6, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

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).

CVSS Details

Base Score
8.2
Exploitability
3.9
Impact
4.2
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
36.7% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-125 Out-of-bounds Read Memory Safety

Affected Products 13

VendorProductVersionRange
linuxlinux_kernel*≥2.6.12.1  –  <5.10.252
linuxlinux_kernel*≥5.11  –  <5.15.202
linuxlinux_kernel*≥5.16  –  <6.1.165
linuxlinux_kernel*≥6.2  –  <6.6.128
linuxlinux_kernel*≥6.7  –  <6.12.75
linuxlinux_kernel*≥6.13  –  <6.18.16
linuxlinux_kernel*≥6.19  –  <6.19.6
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/07a9b32eaae792ff7d0fcac14d8920c937c0a9c3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5e13d0a37666955b6cfddc0f73cb40ed645b8a05
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/735ee8582da3d239eb0c7a53adca61b79fb228b3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8b300f726640c48c3edfe9c453334dd801f4b74e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/cd5beda7e0e32865e214f28034bb92c1cecff885
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/eaedc0bc18be46fe7f58170e967959a932c4f824
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f6c412dcfd76b0516d51aa847d8f4c7b70381b09
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f895191dc32c53eaf443b6443fe40945b2f92287
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/07a9b32eaae792ff7d0fcac14d8920c937c0a9c3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5e13d0a37666955b6cfddc0f73cb40ed645b8a05
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/735ee8582da3d239eb0c7a53adca61b79fb228b3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8b300f726640c48c3edfe9c453334dd801f4b74e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/cd5beda7e0e32865e214f28034bb92c1cecff885
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/eaedc0bc18be46fe7f58170e967959a932c4f824
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f6c412dcfd76b0516d51aa847d8f4c7b70381b09
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f895191dc32c53eaf443b6443fe40945b2f92287
    Patch