kernel: net/sched: cls_api: fix error handling causing NULL dereference

In the Linux kernel, the following vulnerability has been resolved: net/sched: clsapi: fix error handling causing NULL dereference tcfextsmisscookiebasealloc calls xaalloccyclic which can return 1 if the allocation succeeded after wrapping. This was treated as an error, with value 1 returned to...

Important: kernel-livepatch-6.1.148-173.267

Issue Overview: In the Linux kernel, the following vulnerability has been resolved: net/sched: Fix backlog accounting in qdiscdequeueinternal CVE-2025-39677 In the Linux kernel, the following vulnerability has been resolved: fs/buffer: fix use-after-free when call bhread helper CVE-2025-39691 In...

Unity Linux 20.1070a Security Update: kernel (UTSA-2025-988885)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-988885 advisory. In the Linux kernel, the following vulnerability has been resolved: net/sched: schets: don't remove idle classes from the round-robin list Shuang reported that the...

Unity Linux 20.1070a Security Update: kernel (UTSA-2025-989409)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-989409 advisory. In the Linux kernel, the following vulnerability has been resolved: net/sched: schets: don't peek at classes beyond 'nbands' when the number of DRR classes decreases...

Astra Linux – Vulnerability found in Linux 6.1, Linux 6.12

In the Linux kernel, the following vulnerability has been resolved: net/sched: Returns NULL when htblookupleaf encounters an empty rbtree. htblookupleaf has a BUG that can be triggered with the following commands: tc qdisc del dev lo root tc qdisc add dev lo root handle 1: htb default 1 tc class...

Astra Linux – Vulnerability found in Linux 6.1, Linux 6.12

In the Linux kernel, the following vulnerabilities have been resolved: netsched: schsfq: rejecting invalid perturb periods. Gerrard Tai reported that the perturbperiod of SFQ does not have a range check yet, and this could be exploited to trigger a race condition, which has been fixed in a separa...

Astra Linux – Vulnerability found in Linux 6.1, Linux 6.12

In the Linux kernel, the following vulnerability has been resolved: net/sched: Abort tcmodifyqdisc if parent class does not exist Lion’s patch 1 uncovered an ancient bug in the qdisc API. Whenever a user creates or modifies a qdisc with another qdisc as its parent, the qdisc API will detect that...

Astra Linux – Vulnerability in Linux 6.12

In the Linux kernel, the following vulnerability has been resolved: netsched: genestimator: fix esttimer vs CONFIGPREEMPTRT=y The syzbot reported a warning in esttimer 1. The problem arises from the fact that when CONFIGPREEMPTRT=y is enabled, timer callbacks can be preempted...

EUVD-2025-36665

In the Linux kernel, the following vulnerability has been resolved: net/sched: schqfq: Fix null-deref in aggdequeue To prevent a potential crash in aggdequeue net/sched/schqfq.c when cl-qdisc-ops-peekcl-qdisc returns NULL, we check the return value before using it, similar to the existing approac...

UBUNTU-CVE-2025-40083

In the Linux kernel, the following vulnerability has been resolved: net/sched: schqfq: Fix null-deref in aggdequeue To prevent a potential crash in aggdequeue net/sched/schqfq.c when cl-qdisc-ops-peekcl-qdisc returns NULL, we check the return value before using it, similar to the existing approac...

CVE-2025-40083 net/sched: sch_qfq: Fix null-deref in agg_dequeue

In the Linux kernel, the following vulnerability has been resolved: net/sched: schqfq: Fix null-deref in aggdequeue To prevent a potential crash in aggdequeue net/sched/schqfq.c when cl-qdisc-ops-peekcl-qdisc returns NULL, we check the return value before using it, similar to the existing approac...

CVE-2025-40083

In CVE-2025-40083, the Linux kernel net/sched SCH_QFQ implementation suffered a potential NULL pointer dereference in agg_dequeue when cl->qdisc->ops->peek() could return NULL. The fix adds a guard by validating the peek result before use, mirrors the approach used in sch_hfsc.c, and ref...

Siemens SIMATIC Devices Use After Free (CVE-2023-3609)

A use-after-free vulnerability in the Linux kernel's net/sched: clsu32 component can be exploited to achieve local privilege escalation. If tcfchangeindev fails, u32setparms will immediately return an error after incrementing or decrementing the reference counter in tcfbindfilter. If an attacker...

Siemens SIMATIC, SCALANCE and RUGGEDCOM Devices Use After Free (CVE-2024-53057)

In the Linux kernel, the following vulnerability has been resolved: net/sched: stop qdisctreereducebacklog on TCHROOT. This plugin only works with Tenable.ot. Please visit https://www.tenable.com/products/tenable-ot for more information. %NASLMINLEVEL 80900 C Tenable, Inc. include'compat.inc'; if...

Important: kernel-livepatch-5.10.240-238.966

Issue Overview: In the Linux kernel, the following vulnerability has been resolved: netdevsim: fix memory leak in nsimdrvprobe when nsimdevresourcesregister failed CVE-2022-50500 In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Use rawsmpprocessorid instead of...

Important: kernel-livepatch-5.10.240-238.955

Issue Overview: In the Linux kernel, the following vulnerability has been resolved: dma-buf/dma-resv: check if the new fence is really later CVE-2022-49935 In the Linux kernel, the following vulnerability has been resolved: netdevsim: fix memory leak in nsimdrvprobe when nsimdevresourcesregister...

Siemens SIMATIC Devices Use of Uninitialized Resource (CVE-2024-35893)

In the Linux kernel, the following vulnerability has been resolved: net/sched: actskbmod: prevent kernel-infoleak syzbot found that tcfskbmoddump was copying four bytes from kernel stack to user space. The issue here is that 'struct tcskbmod' has a four bytes hole. We need to clear the structure...

CVE-2023-53733

In the Linux kernel, the following vulnerability has been resolved: net: sched: clsu32: Undo tcfbindfilter if u32replacehwknode When u32replacehwknode fails, we need to undo the tcfbindfilter operation done at u32setparms...

SUSE-SU-2025:20909-1 Security update for kernel-livepatch-MICRO-6-0_Update_2

This update for kernel-livepatch-MICRO-6-0Update2 fixes the following issues: - CVE-2024-49974: NFSD: limit the number of concurrent async COPY operations bsc1232384 - CVE-2025-21971: netsched: Prevent creation of classes with TCHROOT bsc1245794 - CVE-2025-38206: exfat: fix double free in...

Security update for kernel-livepatch-MICRO-6-0_Update_4

This update for kernel-livepatch-MICRO-6-0Update4 fixes the following issues: CVE-2025-21971: netsched: Prevent creation of classes with TCHROOT bsc1245794 CVE-2025-38206: exfat: fix double free in delayedfree bsc1246075 CVE-2025-38396: fs: export anoninodemakesecureinode and fix secretmem LSM...