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CVE-2023-4623

nvd nist
Published: Sep 6, 2023Modified: Jun 17, 2026

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7.8
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability: 1.8 / Impact: 5.9
Source: NVD

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.

Affected (9)

Linux
1 product
Linux Kernel
Debian
1 product
Debian Linux
Configuration A
8 vulnerable
Vulnerable SoftwareAffected Versions
Linux
Linux Kernel
From 2.6.12 to 4.14.327
Linux Kernel
From 4.15 to 4.19.295
Linux Kernel
From 4.20 to 5.4.257
Linux Kernel
From 5.11 to 5.15.132
Linux Kernel
From 5.16 to 6.1.53
Linux Kernel
From 5.5 to 5.10.195
Linux Kernel
From 6.2 to 6.4.16
Linux Kernel
From 6.5 to 6.5.3
Configuration B
1 vulnerable
Vulnerable SoftwareAffected Versions
Debian Linux
Version 10.0

Related CWEs

CWE-416
Use After Free
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (10)

Source: cve-coordination@google.com
Third Party AdvisoryVDB Entry
Source: cve-coordination@google.com
Issue TrackingMailing ListPatchVendor Advisory
Source: cve-coordination@google.com
PatchVendor Advisory
Source: cve-coordination@google.com
Mailing ListThird Party Advisory
Source: cve-coordination@google.com
Mailing ListThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party AdvisoryVDB Entry
Source: af854a3a-2127-422b-91ae-364da2661108
Issue TrackingMailing ListPatchVendor Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
PatchVendor Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing ListThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing ListThird Party Advisory

Timeline

No history available yet.