Описание
A use-after-free vulnerability in the Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component can be exploited to achieve local privilege escalation.
If a class with a link-sharing curve (i.e. with the HFSC_FSC flag set) has a parent without a link-sharing curve, then init_vf() will call vttree_insert() on the parent, but vttree_remove() will be skipped in update_vf(). This leaves a dangling pointer that can cause a use-after-free.
We recommend upgrading past commit b3d26c5702c7d6c45456326e56d2ccf3f103e60f.
A use-after-free flaw was found in the Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component that can be exploited to achieve local privilege escalation. If a class with a link-sharing curve, for example, with the HFSC_FSC flag set, has a parent without a link-sharing curve, then init_vf() will call vttree_insert() on the parent, but vttree_remove() will be skipped in update_vf(). This leaves a dangling pointer that can cause a use-after-free issue.
Меры по смягчению последствий
To mitigate this issue, prevent the module sch_hfsc from being loaded by blacklisting the module to prevent it from loading automatically.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 6 | kernel | Out of support scope | ||
| Red Hat Enterprise Linux 9 | kernel-rt | Affected | ||
| Red Hat Enterprise Linux 7 | kernel-rt | Fixed | RHSA-2024:2003 | 23.04.2024 |
| Red Hat Enterprise Linux 7 | kpatch-patch | Fixed | RHSA-2024:1960 | 23.04.2024 |
| Red Hat Enterprise Linux 7 | kernel | Fixed | RHSA-2024:2004 | 23.04.2024 |
| Red Hat Enterprise Linux 7.6 Advanced Update Support(Disable again in 2026 - SPRHEL-7118) | kernel | Fixed | RHSA-2024:1747 | 10.04.2024 |
| Red Hat Enterprise Linux 7.7 Advanced Update Support | kernel | Fixed | RHSA-2024:1746 | 10.04.2024 |
| Red Hat Enterprise Linux 8 | kernel-rt | Fixed | RHSA-2024:0881 | 20.02.2024 |
| Red Hat Enterprise Linux 8 | kpatch-patch | Fixed | RHSA-2024:0876 | 20.02.2024 |
| Red Hat Enterprise Linux 8 | kernel | Fixed | RHSA-2024:0897 | 20.02.2024 |
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Дополнительная информация
Статус:
EPSS
7.8 High
CVSS3
Связанные уязвимости
A use-after-free vulnerability in the Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component can be exploited to achieve local privilege escalation. If a class with a link-sharing curve (i.e. with the HFSC_FSC flag set) has a parent without a link-sharing curve, then init_vf() will call vttree_insert() on the parent, but vttree_remove() will be skipped in update_vf(). This leaves a dangling pointer that can cause a use-after-free. We recommend upgrading past commit b3d26c5702c7d6c45456326e56d2ccf3f103e60f.
A use-after-free vulnerability in the Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component can be exploited to achieve local privilege escalation. If a class with a link-sharing curve (i.e. with the HFSC_FSC flag set) has a parent without a link-sharing curve, then init_vf() will call vttree_insert() on the parent, but vttree_remove() will be skipped in update_vf(). This leaves a dangling pointer that can cause a use-after-free. We recommend upgrading past commit b3d26c5702c7d6c45456326e56d2ccf3f103e60f.
A use-after-free vulnerability in the Linux kernel's net/sched: sch_hf ...
Security update for the Linux Kernel (Live Patch 5 for SLE 15 SP5)
Security update for the Linux Kernel (Live Patch 42 for SLE 15 SP1)
EPSS
7.8 High
CVSS3