CVE-2025-38177 — sch_hfsc: make hfsc_qlen_notify() idempotent

Affected: Linux

In the Linux kernel, the following vulnerability has been resolved:

sch_hfsc: make hfsc_qlen_notify() idempotent

hfsc_qlen_notify() is not idempotent either and not friendly to its callers, like fq_codel_dequeue(). Let's make it idempotent to ease qdisc_tree_reduce_backlog() callers' life:

1. update_vf() decreases cl->cl_nactive, so we can check whether it is non-zero before calling it.

2. eltree_remove() always removes RB node cl->el_node, but we can use RB_EMPTY_NODE() + RB_CLEAR_NODE() to make it safe.

USN-7653-1 — linux-hwe-6.8 vulnerabilities

Affected: Ubuntu:22.04:LTS: linux-hwe-6.8

It was discovered that the CIFS network file system implementation in the Linux kernel did not properly verify the target namespace when handling upcalls. An attacker could use this to expose sensitive information. (CVE-2025-2312)

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - PowerPC architecture; - S390 architecture; - Block layer subsystem; - Serial ATA and Parallel ATA drivers; - Drivers core; - Network block device driver; - Character device driver; - TPM device driver; - Clock framework and drivers; - FireWire subsystem; - GPIO subsystem; - GPU drivers; - HID subsystem; - I3C subsystem; - InfiniBand drivers; - IOMMU subsystem; - IRQ chip drivers; - Media drivers; - NVIDIA Tegra memory controller driver; - Fastrpc Driver; - Network drivers; - Mellanox network drivers; - Operating Performance Points (OPP) driver; - PCI subsystem; - x86 platform drivers; - i.MX PM domains; - PPS (Pulse Per Second) driver; - PTP clock framework; - Remote Processor subsystem; - Real Time Clock drivers; - SCSI subsystem; - QCOM SoC drivers; - Media staging drivers; - TTY drivers; - UFS subsystem; - USB Gadget drivers; - USB Host Controller drivers; - USB Serial drivers; - AFS file system; - File systems infrastructure; - BTRFS file system; - F2FS file system; - GFS2 file sy…

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CVE-2025-38177 — sch_hfsc: make hfsc_qlen_notify() idempotent

USN-7653-1 — linux-hwe-6.8 vulnerabilities