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kernel: net_sched: hfsc: Address reentrant enqueue adding class to eltree twice

🗓️ 24 Sep 2025 13:10:55Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 12 Views

Linux kernel HFSC with Netem flaw enables reentrant class enqueue in eltree, risking use-after-free and crash.

Related
Packages
Refs
OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.8ppc64lekpatch-patch-4_18_0-477_67_11-11.el8_8kpatch-patch-4_18_0-477_67_1-1-11.el8_8.ppc64le.rpm
Red Hat Enterprise Linux8.8x86_64kpatch-patch-4_18_0-477_67_11-11.el8_8kpatch-patch-4_18_0-477_67_1-1-11.el8_8.x86_64.rpm
Red Hat Enterprise Linux8.8ppc64lekpatch-patch-4_18_0-477_67_1-debuginfo1-11.el8_8kpatch-patch-4_18_0-477_67_1-debuginfo-1-11.el8_8.ppc64le.rpm
Red Hat Enterprise Linux8.8x86_64kpatch-patch-4_18_0-477_67_1-debuginfo1-11.el8_8kpatch-patch-4_18_0-477_67_1-debuginfo-1-11.el8_8.x86_64.rpm
Red Hat Enterprise Linux8.8ppc64lekpatch-patch-4_18_0-477_67_1-debugsource1-11.el8_8kpatch-patch-4_18_0-477_67_1-debugsource-1-11.el8_8.ppc64le.rpm
Red Hat Enterprise Linux8.8x86_64kpatch-patch-4_18_0-477_67_1-debugsource1-11.el8_8kpatch-patch-4_18_0-477_67_1-debugsource-1-11.el8_8.x86_64.rpm
Red Hat Enterprise Linux8.8ppc64lekpatch-patch-4_18_0-477_81_11-9.el8_8kpatch-patch-4_18_0-477_81_1-1-9.el8_8.ppc64le.rpm
Red Hat Enterprise Linux8.8x86_64kpatch-patch-4_18_0-477_81_11-9.el8_8kpatch-patch-4_18_0-477_81_1-1-9.el8_8.x86_64.rpm
Red Hat Enterprise Linux8.8ppc64lekpatch-patch-4_18_0-477_81_1-debuginfo1-9.el8_8kpatch-patch-4_18_0-477_81_1-debuginfo-1-9.el8_8.ppc64le.rpm
Red Hat Enterprise Linux8.8x86_64kpatch-patch-4_18_0-477_81_1-debuginfo1-9.el8_8kpatch-patch-4_18_0-477_81_1-debuginfo-1-9.el8_8.x86_64.rpm
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30 Jul 2026 09:13Current
7.1High risk
Vulners AI Score7.1
CVSS 3.15.5 - 7.8
EPSS0.00387
12