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

🗓️ 22 Apr 2026 00:15:56Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 12 Views

Local user can trigger use-after-free in br_multicast_port_ctx_init, risking instability or privilege escalation.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9.2x86_64kernel-rt5.14.0-284.166.1.rt14.451.el9_2kernel-rt-5.14.0-284.166.1.rt14.451.el9_2.x86_64.rpm
Red Hat Enterprise Linux9.2x86_64kernel-rt-core5.14.0-284.166.1.rt14.451.el9_2kernel-rt-core-5.14.0-284.166.1.rt14.451.el9_2.x86_64.rpm
Red Hat Enterprise Linux9.2x86_64kernel-rt-debug5.14.0-284.166.1.rt14.451.el9_2kernel-rt-debug-5.14.0-284.166.1.rt14.451.el9_2.x86_64.rpm
Red Hat Enterprise Linux9.2x86_64kernel-rt-debug-core5.14.0-284.166.1.rt14.451.el9_2kernel-rt-debug-core-5.14.0-284.166.1.rt14.451.el9_2.x86_64.rpm
Red Hat Enterprise Linux9.2x86_64kernel-rt-debug-debuginfo5.14.0-284.166.1.rt14.451.el9_2kernel-rt-debug-debuginfo-5.14.0-284.166.1.rt14.451.el9_2.x86_64.rpm
Red Hat Enterprise Linux9.2x86_64kernel-rt-debug-devel5.14.0-284.166.1.rt14.451.el9_2kernel-rt-debug-devel-5.14.0-284.166.1.rt14.451.el9_2.x86_64.rpm
Red Hat Enterprise Linux9.2x86_64kernel-rt-debug-kvm5.14.0-284.166.1.rt14.451.el9_2kernel-rt-debug-kvm-5.14.0-284.166.1.rt14.451.el9_2.x86_64.rpm
Red Hat Enterprise Linux9.2x86_64kernel-rt-debug-modules5.14.0-284.166.1.rt14.451.el9_2kernel-rt-debug-modules-5.14.0-284.166.1.rt14.451.el9_2.x86_64.rpm
Red Hat Enterprise Linux9.2x86_64kernel-rt-debug-modules-core5.14.0-284.166.1.rt14.451.el9_2kernel-rt-debug-modules-core-5.14.0-284.166.1.rt14.451.el9_2.x86_64.rpm
Red Hat Enterprise Linux9.2x86_64kernel-rt-debug-modules-extra5.14.0-284.166.1.rt14.451.el9_2kernel-rt-debug-modules-extra-5.14.0-284.166.1.rt14.451.el9_2.x86_64.rpm
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12 Jul 2026 07:55Current
5.7Medium risk
Vulners AI Score5.7
CVSS 3.17.8
EPSS0.00248
SSVC
CWE-825
bridge multicastuse after freememory corruptionrouter port listsprivilege escalationdenial of servicelocal user
12