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

🗓️ 08 Apr 2026 15:45:13Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 5 Views

Local user triggers bridge multicast use after free via misconfigured router ports, causing freed memory references.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9.0x86_64kernel-rt5.14.0-70.173.1.rt21.245.el9_0kernel-rt-5.14.0-70.173.1.rt21.245.el9_0.x86_64.rpm
Red Hat Enterprise Linux9.0x86_64kernel-rt-core5.14.0-70.173.1.rt21.245.el9_0kernel-rt-core-5.14.0-70.173.1.rt21.245.el9_0.x86_64.rpm
Red Hat Enterprise Linux9.0x86_64kernel-rt-debug5.14.0-70.173.1.rt21.245.el9_0kernel-rt-debug-5.14.0-70.173.1.rt21.245.el9_0.x86_64.rpm
Red Hat Enterprise Linux9.0x86_64kernel-rt-debug-core5.14.0-70.173.1.rt21.245.el9_0kernel-rt-debug-core-5.14.0-70.173.1.rt21.245.el9_0.x86_64.rpm
Red Hat Enterprise Linux9.0x86_64kernel-rt-debug-debuginfo5.14.0-70.173.1.rt21.245.el9_0kernel-rt-debug-debuginfo-5.14.0-70.173.1.rt21.245.el9_0.x86_64.rpm
Red Hat Enterprise Linux9.0x86_64kernel-rt-debug-devel5.14.0-70.173.1.rt21.245.el9_0kernel-rt-debug-devel-5.14.0-70.173.1.rt21.245.el9_0.x86_64.rpm
Red Hat Enterprise Linux9.0x86_64kernel-rt-debug-kvm5.14.0-70.173.1.rt21.245.el9_0kernel-rt-debug-kvm-5.14.0-70.173.1.rt21.245.el9_0.x86_64.rpm
Red Hat Enterprise Linux9.0x86_64kernel-rt-debug-modules5.14.0-70.173.1.rt21.245.el9_0kernel-rt-debug-modules-5.14.0-70.173.1.rt21.245.el9_0.x86_64.rpm
Red Hat Enterprise Linux9.0x86_64kernel-rt-debug-modules-extra5.14.0-70.173.1.rt21.245.el9_0kernel-rt-debug-modules-extra-5.14.0-70.173.1.rt21.245.el9_0.x86_64.rpm
Red Hat Enterprise Linux9.0x86_64kernel-rt-debuginfo5.14.0-70.173.1.rt21.245.el9_0kernel-rt-debuginfo-5.14.0-70.173.1.rt21.245.el9_0.x86_64.rpm
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08 Jul 2026 12:19Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.17.8
EPSS0.00248
SSVC
CWE-825
bridge multicastuse after freerouter portsmemory corruptiondenial of serviceprivilege escalationlocal user
5