CVE-2023-4623 — Use After Free in Kernel
Severity
7.8HIGHNVD
EPSS
0.0%
top 95.77%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedSep 6
Latest updateNov 28
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 b3d26c570…
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9
Affected Packages3 packages
Also affects: Debian Linux 10.0
Patches
🔴Vulnerability Details
3GHSA▶
GHSA-j8c5-g64v-xj97: 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 priv↗2023-09-06
CVEList▶
Use-after-free in Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component↗2023-09-06
OSV▶
CVE-2023-4623: 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 priv↗2023-09-06