Threats Tagged 'cve-2025-38350'

This is a kernel live patch module which can be loaded by the kpatch command line utility to modify the code of a running kernel. This patch module is targeted for kernel-4.18.0-477.67.1.el8_8. Security Fix(es): * kernel: net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc (CVE-2025-37890) * kernel: net_sched: hfsc: Address reentrant enqueue adding class to eltree twice (CVE-2025-38001) * kernel: sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() (CVE-2025-38000) * kernel: net/sched: Always pass notifications when child class becomes empty (CVE-2025-38350) * kernel: i2c/designware: Fix an initialization issue (CVE-2025-38380) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

This is a kernel live patch module which can be loaded by the kpatch command line utility to modify the code of a running kernel. This patch module is targeted for kernel-4.18.0-553.16.1.el8_10. Security Fix(es): * kernel: net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc (CVE-2025-37890) * kernel: net_sched: hfsc: Address reentrant enqueue adding class to eltree twice (CVE-2025-38001) * kernel: sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() (CVE-2025-38000) * kernel: net/sched: Always pass notifications when child class becomes empty (CVE-2025-38350) * kernel: i2c/designware: Fix an initialization issue (CVE-2025-38380) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

This is a kernel live patch module which can be loaded by the kpatch command line utility to modify the code of a running kernel. This patch module is targeted for kernel-4.18.0-372.118.1.el8_6. Security Fix(es): * kernel: net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc (CVE-2025-37890) * kernel: net_sched: hfsc: Address reentrant enqueue adding class to eltree twice (CVE-2025-38001) * kernel: sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() (CVE-2025-38000) * kernel: net/sched: Always pass notifications when child class becomes empty (CVE-2025-38350) * kernel: i2c/designware: Fix an initialization issue (CVE-2025-38380) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

This is a kernel live patch module which can be loaded by the kpatch command line utility to modify the code of a running kernel. This patch module is targeted for kernel-5.14.0-427.44.1.el9_4. Security Fix(es): * kernel: net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc (CVE-2025-37890) * kernel: net_sched: hfsc: Address reentrant enqueue adding class to eltree twice (CVE-2025-38001) * kernel: sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() (CVE-2025-38000) * kernel: net/sched: Always pass notifications when child class becomes empty (CVE-2025-38350) * kernel: i2c/designware: Fix an initialization issue (CVE-2025-38380) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

This is a kernel live patch module which can be loaded by the kpatch command line utility to modify the code of a running kernel. This patch module is targeted for kernel-5.14.0-284.104.1.el9_2. Security Fix(es): * kernel: net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc (CVE-2025-37890) * kernel: net_sched: hfsc: Address reentrant enqueue adding class to eltree twice (CVE-2025-38001) * kernel: sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() (CVE-2025-38000) * kernel: net/sched: Always pass notifications when child class becomes empty (CVE-2025-38350) * kernel: i2c/designware: Fix an initialization issue (CVE-2025-38380) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

This is a kernel live patch module which can be loaded by the kpatch command line utility to modify the code of a running kernel. This patch module is targeted for kernel-5.14.0-70.124.1.el9_0. Security Fix(es): * kernel: net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc (CVE-2025-37890) * kernel: net_sched: hfsc: Address reentrant enqueue adding class to eltree twice (CVE-2025-38001) * kernel: sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() (CVE-2025-38000) * kernel: net/sched: Always pass notifications when child class becomes empty (CVE-2025-38350) * kernel: i2c/designware: Fix an initialization issue (CVE-2025-38380) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

CVE-2025-38350 is a high-severity vulnerability in the Linux kernel's network traffic control subsystem that can lead to privilege escalation on Container-Optimized OS nodes. It affects certain versions of Red Hat Enterprise Linux 8 Real Time kernels and Ubuntu Linux kernels, including those used in Google Kubernetes Engine (GKE) Standard clusters. GKE Autopilot clusters are not impacted by default but may be vulnerable if configured with certain profiles. The vulnerability has been addressed by patches released by Red Hat and Ubuntu, requiring system updates and reboots. Users should upgrade to the specified fixed kernel versions to mitigate the issue.

In the Linux kernel, the following vulnerability has been resolved: sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() When enqueuing the first packet to an HFSC class, hfsc_enqueue() calls the child qdisc's peek() operation before incrementing sch->q.qlen and sch->qstats.backlog. If the child qdisc uses qdisc_peek_dequeued(), this may trigger an immediate dequeue and potential packet drop. In such cases, qdisc_tree_reduce_backlog() is called, but the HFSC qdisc's qlen and backlog have not yet been updated, leading to inconsistent queue accounting. This can leave an empty HFSC class in the active list, causing further consequences like use-after-free. This patch fixes the bug by moving the increment of sch->q.qlen and sch->qstats.backlog before the call to the child qdisc's peek() operation. This ensures that queue length and backlog are always accurate when packet drops or dequeues are triggered during the peek.

In the Linux kernel, the following vulnerability has been resolved: net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc As described in Gerrard's report [1], we have a UAF case when an hfsc class has a netem child qdisc. The crux of the issue is that hfsc is assuming that checking for cl->qdisc->q.qlen == 0 guarantees that it hasn't inserted the class in the vttree or eltree (which is not true for the netem duplicate case). This patch checks the n_active class variable to make sure that the code won't insert the class in the vttree or eltree twice, catering for the reentrant case. [1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/

In the Linux kernel, the following vulnerability has been resolved: net_sched: hfsc: Fix a potential UAF in hfsc_dequeue() too Similarly to the previous patch, we need to safe guard hfsc_dequeue() too. But for this one, we don't have a reliable reproducer.