Security update for the Linux Kernel RT (Live Patch 11 for SLE 15 SP6) SUSE Patch security@suse.de SUSE Security Team SUSE-SU-2025:02626-1 Final 1 1 2025-08-04T08:05:31Z current 2025-08-04T08:05:31Z 2025-08-04T08:05:31Z cve-database/bin/generate-cvrf.pl 2017-02-24T01:00:00Z Security update for the Linux Kernel RT (Live Patch 11 for SLE 15 SP6) This update for the Linux Kernel 6.4.0-150600_10_39 fixes several issues. The following security issue was fixed: - CVE-2025-37752: net_sched: sch_sfq: move the limit validation (bsc#1245776). The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). SUSE-2025-2626,SUSE-SLE-Module-Live-Patching-15-SP6-2025-2626 Copyright SUSE LLC under the Creative Commons License 4.0 with Attribution (CC-BY-4.0) https://www.suse.com/support/update/announcement/2025/suse-su-202502626-1/ Link for SUSE-SU-2025:02626-1 https://lists.suse.com/pipermail/sle-updates/2025-August/041056.html E-Mail link for SUSE-SU-2025:02626-1 https://www.suse.com/support/security/rating/ SUSE Security Ratings https://bugzilla.suse.com/1244337 SUSE Bug 1244337 https://bugzilla.suse.com/1245776 SUSE Bug 1245776 https://www.suse.com/security/cve/CVE-2025-37752/ SUSE CVE CVE-2025-37752 page SUSE Linux Enterprise Live Patching 15 SP6 kernel-livepatch-6_4_0-150600_10_39-rt-2-150600.2.1 kernel-livepatch-6_4_0-150600_10_39-rt-2-150600.2.1 as a component of SUSE Linux Enterprise Live Patching 15 SP6 In the Linux kernel, the following vulnerability has been resolved: net_sched: sch_sfq: move the limit validation It is not sufficient to directly validate the limit on the data that the user passes as it can be updated based on how the other parameters are changed. Move the check at the end of the configuration update process to also catch scenarios where the limit is indirectly updated, for example with the following configurations: tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 depth 1 tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 divisor 1 This fixes the following syzkaller reported crash: ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in net/sched/sch_sfq.c:203:6 index 65535 is out of range for type 'struct sfq_head[128]' CPU: 1 UID: 0 PID: 3037 Comm: syz.2.16 Not tainted 6.14.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x201/0x300 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_out_of_bounds+0xf5/0x120 lib/ubsan.c:429 sfq_link net/sched/sch_sfq.c:203 [inline] sfq_dec+0x53c/0x610 net/sched/sch_sfq.c:231 sfq_dequeue+0x34e/0x8c0 net/sched/sch_sfq.c:493 sfq_reset+0x17/0x60 net/sched/sch_sfq.c:518 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035 tbf_reset+0x41/0x110 net/sched/sch_tbf.c:339 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035 dev_reset_queue+0x100/0x1b0 net/sched/sch_generic.c:1311 netdev_for_each_tx_queue include/linux/netdevice.h:2590 [inline] dev_deactivate_many+0x7e5/0xe70 net/sched/sch_generic.c:1375 CVE-2025-37752 SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_10_39-rt-2-150600.2.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2025/suse-su-202502626-1/ https://www.suse.com/security/cve/CVE-2025-37752.html CVE-2025-37752 https://bugzilla.suse.com/1242504 SUSE Bug 1242504 https://bugzilla.suse.com/1245776 SUSE Bug 1245776