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kernel: net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc

🗓️ 02 Sep 2025 06:56:50Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 3 Views

A use-after-free in HFSC with NETEM as a child can crash the kernel; local CAP_NET_ADMIN is required.

Related
Packages
Refs
ReporterTitlePublishedViews
Family
IBM Security Bulletins		Security Bulletin: Vulnerabilities in kernel affects IBM Netezza Appliance
23 Apr 202610:20
–ibm
Tenable Nessus		Amazon Linux 2023 : bpftool, kernel, kernel-devel (ALAS2023-2025-1050)
10 Jul 202500:00
–nessus
Tenable Nessus		Amazon Linux 2023 : bpftool, kernel6.12, kernel6.12-modules-extra (ALAS2023-2025-994)
12 Jun 202500:00
–nessus
Tenable Nessus		Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.10-2025-095 (ALASKERNEL-5.10-2025-095)
23 Jun 202500:00
–nessus
Tenable Nessus		Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.15-2025-073 (ALASKERNEL-5.15-2025-073)
9 Jun 202500:00
–nessus
Tenable Nessus		Amazon Linux 2 : kernel (ALASKERNEL-5.4-2025-103)
23 Jun 202500:00
–nessus
Tenable Nessus		AlmaLinux 10 : kernel (ALSA-2025:12662)
9 Oct 202500:00
–nessus
Tenable Nessus		AlmaLinux 9 : kernel (ALSA-2025:12746)
7 Aug 202500:00
–nessus
Tenable Nessus		AlmaLinux 8 : kernel (ALSA-2025:12752)
7 Aug 202500:00
–nessus
Tenable Nessus		AlmaLinux 8 : kernel-rt (ALSA-2025:12753)
7 Aug 202500:00
–nessus
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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.4x86_64bpftool4.18.0-305.170.1.el8_4bpftool-4.18.0-305.170.1.el8_4.x86_64.rpm
Red Hat Enterprise Linux8.4x86_64bpftool-debuginfo4.18.0-305.170.1.el8_4bpftool-debuginfo-4.18.0-305.170.1.el8_4.x86_64.rpm
Red Hat Enterprise Linux8.4x86_64kernel4.18.0-305.170.1.el8_4kernel-4.18.0-305.170.1.el8_4.x86_64.rpm
Red Hat Enterprise Linux8.4noarchkernel-abi-stablelists4.18.0-305.170.1.el8_4kernel-abi-stablelists-4.18.0-305.170.1.el8_4.noarch.rpm
Red Hat Enterprise Linux8.4x86_64kernel-core4.18.0-305.170.1.el8_4kernel-core-4.18.0-305.170.1.el8_4.x86_64.rpm
Red Hat Enterprise Linux8.4x86_64kernel-debug4.18.0-305.170.1.el8_4kernel-debug-4.18.0-305.170.1.el8_4.x86_64.rpm
Red Hat Enterprise Linux8.4x86_64kernel-debug-core4.18.0-305.170.1.el8_4kernel-debug-core-4.18.0-305.170.1.el8_4.x86_64.rpm
Red Hat Enterprise Linux8.4x86_64kernel-debug-debuginfo4.18.0-305.170.1.el8_4kernel-debug-debuginfo-4.18.0-305.170.1.el8_4.x86_64.rpm
Red Hat Enterprise Linux8.4x86_64kernel-debug-devel4.18.0-305.170.1.el8_4kernel-debug-devel-4.18.0-305.170.1.el8_4.x86_64.rpm
Red Hat Enterprise Linux8.4x86_64kernel-debug-modules4.18.0-305.170.1.el8_4kernel-debug-modules-4.18.0-305.170.1.el8_4.x86_64.rpm
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30 Jun 2026 03:31Current
7.3High risk
Vulners AI Score7.3
CVSS 3.17.8
EPSS0.00171
SSVC
CWE-416
linux kernelhfsc queuing disciplinenetem child qdiscuse after freelocal exploitdenial of serviceprivilege escalation
3