vulnerability

Red Hat: CVE-2023-4623: kernel: net/sched: sch_hfsc UAF (Multiple Advisories)

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Severity
7
CVSS
(AV:L/AC:L/Au:S/C:C/I:C/A:C)
Published
2023-09-06
Added
2024-01-25
Modified
2025-02-20

Description

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.

Solution(s)

redhat-upgrade-kernelredhat-upgrade-kernel-rt

References

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