CVE-2026-23074 SUSE CVE security@suse.de SUSE Security Team SUSE CVE-2026-23074 Interim 1 1 2026-03-05T00:17:38Z current 2026-03-05T00:17:38Z 2026-03-05T00:17:38Z cve-database/bin/generate-cvrf-cve.pl 2020-12-27T01:00:00Z CVE-2026-23074 In the Linux kernel, the following vulnerability has been resolved: net/sched: Enforce that teql can only be used as root qdisc Design intent of teql is that it is only supposed to be used as root qdisc. We need to check for that constraint. Although not important, I will describe the scenario that unearthed this issue for the curious. GangMin Kim <km.kim1503@gmail.com> managed to concot a scenario as follows: ROOT qdisc 1:0 (QFQ) ├── class 1:1 (weight=15, lmax=16384) netem with delay 6.4s ── class 1:2 (weight=1, lmax=1514) teql GangMin sends a packet which is enqueued to 1:1 (netem). Any invocation of dequeue by QFQ from this class will not return a packet until after 6.4s. In the meantime, a second packet is sent and it lands on 1:2. teql's enqueue will return success and this will activate class 1:2. Main issue is that teql only updates the parent visible qlen (sch->q.qlen) at dequeue. Since QFQ will only call dequeue if peek succeeds (and teql's peek always returns NULL), dequeue will never be called and thus the qlen will remain as 0. With that in mind, when GangMin updates 1:2's lmax value, the qfq_change_class calls qfq_deact_rm_from_agg. Since the child qdisc's qlen was not incremented, qfq fails to deactivate the class, but still frees its pointers from the aggregate. So when the first packet is rescheduled after 6.4 seconds (netem's delay), a dangling pointer is accessed causing GangMin's causing a UAF. The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). https://lists.suse.com/pipermail/suse-liberty-linux-updates/2026-February/002524.html E-Mail link for RHSA-2026:3083 https://lists.suse.com/pipermail/sle-security-updates/2026-February/024378.html E-Mail link for SUSE-SU-2026:0617-1 https://www.suse.com/support/security/rating/ SUSE Security Ratings SUSE Liberty Linux 8 SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise Module for Development Tools 15 SP7 SUSE Linux Enterprise Workstation Extension 15 SP7 SUSE Linux Enterprise High Availability Extension 15 SP4 SUSE Linux Enterprise High Availability Extension 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise Module for Development Tools 15 SP7 SUSE 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15 SP3-LTSS kernel-macros as a component of SUSE Linux Enterprise Server 15 SP3-LTSS kernel-source as a component of SUSE Linux Enterprise Server 15 SP3-LTSS cluster-md-kmp-default as a component of SUSE Linux Enterprise Server 15 SP5-LTSS dlm-kmp-default as a component of SUSE Linux Enterprise Server 15 SP5-LTSS gfs2-kmp-default as a component of SUSE Linux Enterprise Server 15 SP5-LTSS kernel-default as a component of SUSE Linux Enterprise Server 15 SP5-LTSS kernel-default-devel as a component of SUSE Linux Enterprise Server 15 SP5-LTSS ocfs2-kmp-default as a component of SUSE Linux Enterprise Server 15 SP5-LTSS reiserfs-kmp-default as a component of SUSE Linux Enterprise Server 15 SP5-LTSS kernel-devel as a component of SUSE Linux Enterprise Server 15 SP5-LTSS kernel-macros as a component of SUSE Linux Enterprise Server 15 SP5-LTSS kernel-source as a component of SUSE Linux Enterprise Server 15 SP5-LTSS cluster-md-kmp-default as a component of SUSE Linux Enterprise Server 15 SP6-LTSS dlm-kmp-default as a component of SUSE Linux Enterprise Server 15 SP6-LTSS gfs2-kmp-default as a component of SUSE Linux Enterprise Server 15 SP6-LTSS kernel-default as a component of SUSE Linux Enterprise Server 15 SP6-LTSS kernel-default-devel as a component of SUSE Linux Enterprise Server 15 SP6-LTSS ocfs2-kmp-default as a component of SUSE Linux Enterprise Server 15 SP6-LTSS reiserfs-kmp-default as a component of SUSE Linux Enterprise Server 15 SP6-LTSS kernel-devel as a component of SUSE Linux Enterprise Server 15 SP6-LTSS kernel-macros as a component of SUSE Linux Enterprise Server 15 SP6-LTSS kernel-source as a component of SUSE Linux Enterprise Server 15 SP6-LTSS kernel-default as a component of SUSE Linux Enterprise Server 16.0 kernel-devel as a component of SUSE Linux Enterprise Server 16.0 kernel-macros as a component of SUSE Linux Enterprise Server 16.0 kernel-source as a component of SUSE Linux Enterprise Server 16.0 kernel-source-vanilla as a component of SUSE Linux Enterprise Server 16.0 kernel-devel-azure as a component of SUSE Linux Enterprise Server 16.0 kernel-source-azure as a component of SUSE Linux Enterprise Server 16.0 kernel-default as a component of SUSE Linux Enterprise Server Teradata 12 SP3 kernel-source as a component of SUSE Linux Enterprise Server Teradata 12 SP3 cluster-md-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 dlm-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 gfs2-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-default-devel as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 ocfs2-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 reiserfs-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-devel as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-macros as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-source as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 cluster-md-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP6 dlm-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP6 gfs2-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP6 kernel-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP6 kernel-default-devel as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP6 ocfs2-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP6 reiserfs-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP6 kernel-devel as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP6 kernel-macros as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP6 kernel-source as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP6 kernel-default as a component of SUSE Linux Enterprise Server for SAP applications 16.0 kernel-devel as a component of SUSE Linux Enterprise Server for SAP applications 16.0 kernel-macros as a component of SUSE Linux Enterprise Server for SAP applications 16.0 kernel-source as a component of SUSE Linux Enterprise Server for SAP applications 16.0 kernel-source-vanilla as a component of SUSE Linux Enterprise Server for SAP applications 16.0 kernel-devel-azure as a component of SUSE Linux Enterprise Server for SAP applications 16.0 kernel-source-azure as a component of SUSE Linux Enterprise Server for SAP applications 16.0 kernel-default-extra as a component of SUSE Linux Enterprise Workstation Extension 15 SP7 kernel-default as a component of SUSE Linux Enterprise Workstation Extension 15 SP7 kernel-source as a component of SUSE Linux Enterprise Workstation Extension 15 SP7 kernel-default as a component of SUSE Linux Micro 6.0 kernel-devel as a component of SUSE Linux Micro 6.0 kernel-macros as a component of SUSE Linux Micro 6.0 kernel-source as a component of SUSE Linux Micro 6.0 kernel-devel-rt as a component of SUSE Linux Micro 6.0 kernel-source-rt as a component of SUSE Linux Micro 6.0 kernel-default as a component of SUSE Linux Micro 6.1 kernel-devel as a component of SUSE Linux Micro 6.1 kernel-macros as a component of SUSE Linux Micro 6.1 kernel-source as a component of SUSE Linux Micro 6.1 kernel-devel-rt as a component of SUSE Linux Micro 6.1 kernel-source-rt as a component of SUSE Linux Micro 6.1 kernel-devel-rt as a component of SUSE Real Time Module 15 SP7 kernel-source-rt as a component of SUSE Real Time Module 15 SP7 cluster-md-kmp-default as a component of openSUSE Leap 15.6 dlm-kmp-default as a component of openSUSE Leap 15.6 gfs2-kmp-default as a component of openSUSE Leap 15.6 kernel-default as a component of openSUSE Leap 15.6 kernel-default-devel as a component of openSUSE Leap 15.6 kernel-default-extra as a component of openSUSE Leap 15.6 kernel-default-livepatch as a component of openSUSE Leap 15.6 kernel-default-livepatch-devel as a component of openSUSE Leap 15.6 kernel-default-optional as a component of openSUSE Leap 15.6 kernel-default-vdso as a component of openSUSE Leap 15.6 kselftests-kmp-default as a component of openSUSE Leap 15.6 ocfs2-kmp-default as a component of openSUSE Leap 15.6 reiserfs-kmp-default as a component of openSUSE Leap 15.6 kernel-devel as a component of openSUSE Leap 15.6 kernel-macros as a component of openSUSE Leap 15.6 kernel-source as a component of openSUSE Leap 15.6 kernel-source-vanilla as a component of openSUSE Leap 15.6 In the Linux kernel, the following vulnerability has been resolved: net/sched: Enforce that teql can only be used as root qdisc Design intent of teql is that it is only supposed to be used as root qdisc. We need to check for that constraint. Although not important, I will describe the scenario that unearthed this issue for the curious. GangMin Kim <km.kim1503@gmail.com> managed to concot a scenario as follows: ROOT qdisc 1:0 (QFQ) ├── class 1:1 (weight=15, lmax=16384) netem with delay 6.4s ── class 1:2 (weight=1, lmax=1514) teql GangMin sends a packet which is enqueued to 1:1 (netem). Any invocation of dequeue by QFQ from this class will not return a packet until after 6.4s. In the meantime, a second packet is sent and it lands on 1:2. teql's enqueue will return success and this will activate class 1:2. Main issue is that teql only updates the parent visible qlen (sch->q.qlen) at dequeue. Since QFQ will only call dequeue if peek succeeds (and teql's peek always returns NULL), dequeue will never be called and thus the qlen will remain as 0. With that in mind, when GangMin updates 1:2's lmax value, the qfq_change_class calls qfq_deact_rm_from_agg. Since the child qdisc's qlen was not incremented, qfq fails to deactivate the class, but still frees its pointers from the aggregate. So when the first packet is rescheduled after 6.4 seconds (netem's delay), a dangling pointer is accessed causing GangMin's causing a UAF. CVE-2026-23074 SUSE Liberty Linux 8:bpftool-4.18.0-553.107.1.el8_10 SUSE Liberty Linux 8:kernel-4.18.0-553.107.1.el8_10 SUSE Liberty Linux 8:kernel-abi-stablelists-4.18.0-553.107.1.el8_10 SUSE Liberty Linux 8:kernel-core-4.18.0-553.107.1.el8_10 SUSE Liberty Linux 8:kernel-cross-headers-4.18.0-553.107.1.el8_10 SUSE Liberty Linux 8:kernel-debug-4.18.0-553.107.1.el8_10 SUSE Liberty Linux 8:kernel-debug-core-4.18.0-553.107.1.el8_10 SUSE Liberty Linux 8:kernel-debug-devel-4.18.0-553.107.1.el8_10 SUSE Liberty Linux 8:kernel-debug-modules-4.18.0-553.107.1.el8_10 SUSE Liberty Linux 8:kernel-debug-modules-extra-4.18.0-553.107.1.el8_10 SUSE Liberty Linux 8:kernel-devel-4.18.0-553.107.1.el8_10 SUSE Liberty Linux 8:kernel-doc-4.18.0-553.107.1.el8_10 SUSE Liberty Linux 8:kernel-headers-4.18.0-553.107.1.el8_10 SUSE Liberty Linux 8:kernel-modules-4.18.0-553.107.1.el8_10 SUSE Liberty Linux 8:kernel-modules-extra-4.18.0-553.107.1.el8_10 SUSE Liberty Linux 8:kernel-tools-4.18.0-553.107.1.el8_10 SUSE Liberty Linux 8:kernel-tools-libs-4.18.0-553.107.1.el8_10 SUSE Liberty Linux 8:kernel-tools-libs-devel-4.18.0-553.107.1.el8_10 SUSE Liberty Linux 8:perf-4.18.0-553.107.1.el8_10 SUSE Liberty Linux 8:python3-perf-4.18.0-553.107.1.el8_10 SUSE Linux Enterprise High Availability Extension 15 SP4:cluster-md-kmp-default-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Availability Extension 15 SP4:dlm-kmp-default-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Availability Extension 15 SP4:gfs2-kmp-default-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Availability Extension 15 SP4:ocfs2-kmp-default-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:kernel-64kb-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:kernel-64kb-devel-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:kernel-default-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:kernel-default-base-5.14.21-150400.24.194.1.150400.24.98.3 SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:kernel-default-devel-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:kernel-devel-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:kernel-docs-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:kernel-macros-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:kernel-obs-build-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:kernel-source-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:kernel-syms-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:reiserfs-kmp-default-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:kernel-64kb-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:kernel-64kb-devel-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:kernel-default-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:kernel-default-base-5.14.21-150400.24.194.1.150400.24.98.3 SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:kernel-default-devel-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:kernel-devel-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:kernel-docs-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:kernel-macros-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:kernel-obs-build-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:kernel-source-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:kernel-syms-5.14.21-150400.24.194.1 SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:reiserfs-kmp-default-5.14.21-150400.24.194.1 SUSE Linux Enterprise Micro 5.3:kernel-default-5.14.21-150400.24.194.1 SUSE Linux Enterprise Micro 5.3:kernel-default-base-5.14.21-150400.24.194.1.150400.24.98.3 SUSE Linux Enterprise Micro 5.4:kernel-default-5.14.21-150400.24.194.1 SUSE Linux Enterprise Micro 5.4:kernel-default-base-5.14.21-150400.24.194.1.150400.24.98.3 SUSE Linux Enterprise Server 15 SP4-LTSS:kernel-64kb-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server 15 SP4-LTSS:kernel-64kb-devel-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server 15 SP4-LTSS:kernel-default-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server 15 SP4-LTSS:kernel-default-base-5.14.21-150400.24.194.1.150400.24.98.3 SUSE Linux Enterprise Server 15 SP4-LTSS:kernel-default-devel-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server 15 SP4-LTSS:kernel-devel-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server 15 SP4-LTSS:kernel-docs-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server 15 SP4-LTSS:kernel-macros-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server 15 SP4-LTSS:kernel-obs-build-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server 15 SP4-LTSS:kernel-source-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server 15 SP4-LTSS:kernel-syms-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server 15 SP4-LTSS:kernel-zfcpdump-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server 15 SP4-LTSS:reiserfs-kmp-default-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server 15 SP4-TERADATA:kernel-default-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server 15 SP4-TERADATA:kernel-default-base-5.14.21-150400.24.194.1.150400.24.98.3 SUSE Linux Enterprise Server 15 SP4-TERADATA:kernel-default-devel-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server 15 SP4-TERADATA:kernel-devel-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server 15 SP4-TERADATA:kernel-docs-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server 15 SP4-TERADATA:kernel-macros-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server 15 SP4-TERADATA:kernel-obs-build-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server 15 SP4-TERADATA:kernel-source-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server 15 SP4-TERADATA:kernel-syms-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server 15 SP4-TERADATA:reiserfs-kmp-default-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server for SAP Applications 15 SP4:kernel-default-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server for SAP Applications 15 SP4:kernel-default-base-5.14.21-150400.24.194.1.150400.24.98.3 SUSE Linux Enterprise Server for SAP Applications 15 SP4:kernel-default-devel-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server for SAP Applications 15 SP4:kernel-devel-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server for SAP Applications 15 SP4:kernel-docs-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server for SAP Applications 15 SP4:kernel-macros-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server for SAP Applications 15 SP4:kernel-obs-build-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server for SAP Applications 15 SP4:kernel-source-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server for SAP Applications 15 SP4:kernel-syms-5.14.21-150400.24.194.1 SUSE Linux Enterprise Server for SAP Applications 15 SP4:reiserfs-kmp-default-5.14.21-150400.24.194.1 SUSE Manager Proxy LTS 4.3:kernel-default-5.14.21-150400.24.194.1 SUSE Manager Proxy LTS 4.3:kernel-default-base-5.14.21-150400.24.194.1.150400.24.98.3 SUSE Manager Proxy LTS 4.3:kernel-default-devel-5.14.21-150400.24.194.1 SUSE Manager Proxy LTS 4.3:kernel-devel-5.14.21-150400.24.194.1 SUSE Manager Proxy LTS 4.3:kernel-macros-5.14.21-150400.24.194.1 SUSE Manager Proxy LTS 4.3:kernel-source-5.14.21-150400.24.194.1 SUSE Manager Proxy LTS 4.3:kernel-syms-5.14.21-150400.24.194.1 SUSE Manager Retail Branch Server LTS 4.3:kernel-default-5.14.21-150400.24.194.1 SUSE Manager Retail Branch Server LTS 4.3:kernel-default-base-5.14.21-150400.24.194.1.150400.24.98.3 SUSE Manager Retail Branch Server LTS 4.3:kernel-default-devel-5.14.21-150400.24.194.1 SUSE Manager Retail Branch Server LTS 4.3:kernel-devel-5.14.21-150400.24.194.1 SUSE Manager Retail Branch Server LTS 4.3:kernel-macros-5.14.21-150400.24.194.1 SUSE Manager Server LTS 4.3:kernel-default-5.14.21-150400.24.194.1 SUSE Manager Server LTS 4.3:kernel-default-base-5.14.21-150400.24.194.1.150400.24.98.3 SUSE Manager Server LTS 4.3:kernel-default-devel-5.14.21-150400.24.194.1 SUSE Manager Server LTS 4.3:kernel-devel-5.14.21-150400.24.194.1 SUSE Manager Server LTS 4.3:kernel-macros-5.14.21-150400.24.194.1 SUSE Manager Server LTS 4.3:kernel-source-5.14.21-150400.24.194.1 SUSE Manager Server LTS 4.3:kernel-syms-5.14.21-150400.24.194.1 SUSE Manager Server LTS 4.3:kernel-zfcpdump-5.14.21-150400.24.194.1 important 7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H