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kernel: netfilter: xt_tcpmss: check remaining length before reading optlen

🗓️ 28 May 2026 08:47:08Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 21 Views

Linux kernel netfilter flaw enables remote memory read from crafted packets due to bad option length.

Related
Packages
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB		CVE-2026-43190
6 May 202611:27
–attackerkb
Tenable Nessus		Amazon Linux 2023 : bpftool6.12, kernel6.12, kernel6.12-devel (ALAS2023-2026-1543)
7 Apr 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : bpftool, kernel, kernel-devel (ALAS2023-2026-1544)
7 Apr 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : bpftool6.18, kernel6.18, kernel6.18-devel (ALAS2023-2026-1702)
20 May 202600:00
–nessus
Tenable Nessus		Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.10-2026-115 (ALASKERNEL-5.10-2026-115)
1 Apr 202600:00
–nessus
Tenable Nessus		Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.15-2026-100 (ALASKERNEL-5.15-2026-100)
30 Apr 202600:00
–nessus
Tenable Nessus		AlmaLinux 9 : kernel (ALSA-2026:21556)
7 Jun 202600:00
–nessus
Tenable Nessus		AlmaLinux 8 : kernel (ALSA-2026:21706)
28 May 202600:00
–nessus
Tenable Nessus		AlmaLinux 8 : kernel-rt (ALSA-2026:21745)
29 May 202600:00
–nessus
Tenable Nessus		Debian dla-4606 : ata-modules-5.10.0-43-armmp-di - security update
3 Jun 202600:00
–nessus
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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.10aarch64bpftool4.18.0-553.126.1.el8_10bpftool-4.18.0-553.126.1.el8_10.aarch64.rpm
Red Hat Enterprise Linux8.10ppc64lebpftool4.18.0-553.126.1.el8_10bpftool-4.18.0-553.126.1.el8_10.ppc64le.rpm
Red Hat Enterprise Linux8.10s390xbpftool4.18.0-553.126.1.el8_10bpftool-4.18.0-553.126.1.el8_10.s390x.rpm
Red Hat Enterprise Linux8.10x86_64bpftool4.18.0-553.126.1.el8_10bpftool-4.18.0-553.126.1.el8_10.x86_64.rpm
Red Hat Enterprise Linux8.10aarch64bpftool-debuginfo4.18.0-553.126.1.el8_10bpftool-debuginfo-4.18.0-553.126.1.el8_10.aarch64.rpm
Red Hat Enterprise Linux8.10ppc64lebpftool-debuginfo4.18.0-553.126.1.el8_10bpftool-debuginfo-4.18.0-553.126.1.el8_10.ppc64le.rpm
Red Hat Enterprise Linux8.10s390xbpftool-debuginfo4.18.0-553.126.1.el8_10bpftool-debuginfo-4.18.0-553.126.1.el8_10.s390x.rpm
Red Hat Enterprise Linux8.10x86_64bpftool-debuginfo4.18.0-553.126.1.el8_10bpftool-debuginfo-4.18.0-553.126.1.el8_10.x86_64.rpm
Red Hat Enterprise Linux8.10aarch64kernel4.18.0-553.126.1.el8_10kernel-4.18.0-553.126.1.el8_10.aarch64.rpm
Red Hat Enterprise Linux8.10ppc64lekernel4.18.0-553.126.1.el8_10kernel-4.18.0-553.126.1.el8_10.ppc64le.rpm
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23 Jul 2026 16:22Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.18.2
EPSS0.00463
CWE-125
linux kernelnetfiltertransmission control mssmemory disclosureremote attackercrafted packets
21