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kernel: Linux kernel:A use-after-free in bridge multicast in br_multicast_port_ctx_init

🗓️ 23 Feb 2026 13:25:32Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 2 Views

Local user can trigger use-after-free in bridge multicast port init via misconfigured router ports.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.10aarch64bpftool4.18.0-553.107.1.el8_10bpftool-4.18.0-553.107.1.el8_10.aarch64.rpm
Red Hat Enterprise Linux8.10ppc64lebpftool4.18.0-553.107.1.el8_10bpftool-4.18.0-553.107.1.el8_10.ppc64le.rpm
Red Hat Enterprise Linux8.10s390xbpftool4.18.0-553.107.1.el8_10bpftool-4.18.0-553.107.1.el8_10.s390x.rpm
Red Hat Enterprise Linux8.10x86_64bpftool4.18.0-553.107.1.el8_10bpftool-4.18.0-553.107.1.el8_10.x86_64.rpm
Red Hat Enterprise Linux8.10aarch64bpftool-debuginfo4.18.0-553.107.1.el8_10bpftool-debuginfo-4.18.0-553.107.1.el8_10.aarch64.rpm
Red Hat Enterprise Linux8.10ppc64lebpftool-debuginfo4.18.0-553.107.1.el8_10bpftool-debuginfo-4.18.0-553.107.1.el8_10.ppc64le.rpm
Red Hat Enterprise Linux8.10s390xbpftool-debuginfo4.18.0-553.107.1.el8_10bpftool-debuginfo-4.18.0-553.107.1.el8_10.s390x.rpm
Red Hat Enterprise Linux8.10x86_64bpftool-debuginfo4.18.0-553.107.1.el8_10bpftool-debuginfo-4.18.0-553.107.1.el8_10.x86_64.rpm
Red Hat Enterprise Linux8.10aarch64kernel4.18.0-553.107.1.el8_10kernel-4.18.0-553.107.1.el8_10.aarch64.rpm
Red Hat Enterprise Linux8.10ppc64lekernel4.18.0-553.107.1.el8_10kernel-4.18.0-553.107.1.el8_10.ppc64le.rpm
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30 Jun 2026 04:33Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.17.8
EPSS0.00248
SSVC
CWE-825
bridge multicastuse after freelocal userrouter portsmemory corruptionvulnerabilitydenial of serviceprivilege escalation
2