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nvd[email protected]NVD:CVE-2023-4623
HistorySep 06, 2023 - 2:15 p.m.

CVE-2023-4623

2023-09-0614:15:12
CWE-416
web.nvd.nist.gov
1
linux kernel
net/sched
sch_hfsc
use-after-free vulnerability
local privilege escalation
hfsc qdisc traffic control
cve-2023-4623
commit b3d26c5702c7d6c45456326e56d2ccf3f103e60f

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

AI Score

7.7

Confidence

High

EPSS

0

Percentile

5.1%

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.

Affected configurations

NVD
Node
linuxlinux_kernelRange2.6.12–6.6
Node
debiandebian_linuxMatch10.0

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

AI Score

7.7

Confidence

High

EPSS

0

Percentile

5.1%