CVE-2025-38001

CVE-2025-38001 RBTree Family Drama Linux HFSC Eltree Use-After-Free - Debian 12 PoC This PoC utilizes a page-level data-only attack based on RBTree transformations to compromise the system. The exploit is portable and works on all kernelCTF instances LTS 6.6.90, COS 109, COS 105 and Debian 12. On...

CVE-2025-38001

CVE-2025-38001---Linux-Kernel-HFSC-RBTree-Use-After-Free-Research This repository contains a Proof of Concept PoC for the CVE-2025-38001 security vulnerability that targets the HFSC module in the Linux Kernel. Created specifically as learning material for kernel memory corruption and security...

CLSA-2025-1758010922 Fix of 49 CVEs

CVE-url: https://ubuntu.com/security/CVE-2025-38000 - schhfsc: Fix qlen accounting bug when using peek in hfscenqueue CVE-url: https://ubuntu.com/security/CVE-2024-57996 // CVE-url: https://ubuntu.com/security/CVE-2025-37752 - netsched: schsfq: move the limit validation Focal update: v5.4.285...

CVE-2026-98610

A flaw was found in the Linux kernel's Hierarchical Fair Service Curve HFSC network packet scheduler. A local user with network administration privileges, such as within a user namespace, can exploit this flaw to cause a Denial of Service DoS. Due to a lack of revalidation when traffic class leve...

CLSA-2026-1769610819 kernel: Fix of 42 CVEs

Bluetooth: hcisysfs: Fix attempting to call deviceadd multiple times CVE-2022-50419 - firewire: net: fix use after free in fwnetfinishincomingpacket CVE-2023-53432 - wifi: brcmfmac: fix use-after-free bug in brcmfnetdevstartxmit CVE-2022-50408 - wifi: brcmfmac: slab-out-of-bounds read in...

CLSA-2024-1705496067 kernel: Fix of 16 CVEs

Bluetooth: L2CAP: Fix use-after-free in l2capsockreadycb CVE-2023-40283 - ipv4: igmp: fix refcnt uaf issue when receiving igmp query packet CVE-2023-6932 - smb: client: fix OOB in smbCalcSize CVE-2023-6606 - net/sched: schhfsc: Ensure inner classes have fsc curve CVE-2023-4623 - net/sched: clsfw:...

PT-2026-116829

In the Linux kernel, the following vulnerability has been resolved: net/sched: sch hfsc: bound the classify inner-filter walk with a drift budget hfsc classify applies the "filter may only point downwards" level check only when the filter result carries no bound class. A filter created with a...

Rocky Linux 8 [CIQ] Security Update: kernel-rt / kernel-rt-core / kernel-rt-debug / kernel-rt-debug-core / etc Multiple Vulnerabilities (crlsa-2025_12753)

The Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-202512753 advisory. kernel: HID: intel-ish-hid: Fix use-after-free issue in ishtphidremove CVE-2025-21928 kernel: memstick: rtsxusbms: Fix slab-use-after-free in...

Rocky Linux 10.0 [CIQ] Security Update: kernel / kernel-64k / kernel-64k-core / kernel-64k-debug / etc Multiple Vulnerabilities (crlsa-2025_11855)

The Rocky Linux 10.0 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-202511855 advisory. kernel: RDMA/mlx5: Fix pagesize variable overflow CVE-2025-22091 kernel: ext4: fix out-of-bound read in ext4xattrinodedecrefall CVE-2025-22121 kernel:...

Rocky Linux 8 [CIQ] Security Update: bpftool / bpftool-debuginfo / kernel / kernel-abi-stablelists / etc Multiple Vulnerabilities (crlsa-2025_12752)

The Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-202512752 advisory. kernel: HID: intel-ish-hid: Fix use-after-free issue in ishtphidremove CVE-2025-21928 kernel: memstick: rtsxusbms: Fix slab-use-after-free in...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: netsched: hfsc: Fixed a UAF vulnerability in class handling This patch addresses a Use-After-Free vulnerability in the HFSC qdisc class handling. The issue arises due to a time-of-check/time-of-use condition in hfscchangeclass,...

Astra Linux – Vulnerability found in Linux 6.1, Linux 5.10, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: schhfsc: made hfscqlennotify idempotent. hfscqlennotify itself is not idempotent, and it is not friendly to its callers, like fqcodeldequeue. We need to make it idempotent to ease the work of qdisctreereducebacklog callers: 1...

Astra Linux – Vulnerabilities in Linux, Linux-5.10, Linux-5.15, Linux-6.1

A use-after-free vulnerability exists in the Linux kernel’s net/sched: schhfsc HFSC qdisc traffic control component, which can be exploited to achieve local privilege escalation. If a class with a link-sharing curve i.e., with the HFSCFSC flag set has a parent without a link-sharing curve, then...

Unity Linux 20.1050a Security Update: kernel (UTSA-2026-098756)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-098756 advisory. In the Linux kernel, the following vulnerability has been resolved: schhfsc: make hfscqlennotify idempotent hfscqlennotify is not idempotent either and not friendly ...

Unity Linux 20.1050a Security Update: kernel (UTSA-2026-098684)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-098684 advisory. In the Linux kernel, the following vulnerability has been resolved: netsched: hfsc: Fix a UAF vulnerability in class handling This patch fixes a Use-After-Free...

CVE-2026-74284

A flaw was found in the Linux kernel's Hierarchical Fair Service Curve HFSC queueing discipline schhfsc. When a child qdisc drops its last packets, the updatevf function can be called twice for the same class, causing it to be marked passive multiple times. This double transition can lead to a...

Linux Distros Unpatched Vulnerability : CVE-2026-74284

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - net/sched: schhfsc: Don't make class passive twice updatevf is called from two places for the same class during a single dequeue when the class's child qdisc e....

CVE-2026-74284

In the Linux kernel, the following vulnerability has been resolved: net/sched: schhfsc: Don't make class passive twice updatevf is called from two places for the same class during a single dequeue when the class's child qdisc e.g. codel/fqcodel drops its last packets while dequeuing: 1. The child...

EulerOS 2.0 SP12 : kernel (EulerOS-SA-2026-2595)

According to the versions of the kernel packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : Input: alps - fix use-after-free bugs caused by dev3registerworkCVE-2025-68822 ext4: reject mount if bigalloc with sfirstdatablock !=...

PT-2026-72720

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description An issue exists in the Hierarchical Fair Service Curve HFSC scheduler where a class can be marked as passive twice during a single dequeue operation. This occurs when the child qdisc dro...