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CVE-2023-4921

Public on 2023-09-12
Modified on 2024-03-01
Description

A use-after-free vulnerability in the Linux kernel's net/sched: sch_qfq component can be exploited to achieve local privilege escalation.

When the plug qdisc is used as a class of the qfq qdisc, sending network packets triggers use-after-free in qfq_dequeue() due to the incorrect .peek handler of sch_plug and lack of error checking in agg_dequeue().

We recommend upgrading past commit 8fc134fee27f2263988ae38920bc03da416b03d8.

Severity
Important
See what this means
CVSS v3 Base Score
7.8
See breakdown
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 1 kernel 2023-09-27 22:15 ALAS-2023-1838
Amazon Linux 2 - Core kernel 2023-09-27 22:48 ALAS2-2023-2264
Amazon Linux 2 - Kernel-5.10 Extra kernel 2023-09-27 22:59 ALAS2KERNEL-5.10-2023-040
Amazon Linux 2 - Kernel-5.15 Extra kernel 2023-09-27 22:59 ALAS2KERNEL-5.15-2023-027
Amazon Linux 2 - Kernel-5.4 Extra kernel 2023-09-27 22:59 ALAS2KERNEL-5.4-2023-053
Amazon Linux 2023 kernel 2023-09-27 21:04 ALAS2023-2023-356
Amazon Linux 2 - Livepatch Extra kernel-livepatch-4.14.320-243.544 2023-10-31 00:16 ALAS2LIVEPATCH-2023-154
Amazon Linux 2 - Livepatch Extra kernel-livepatch-4.14.322-244.536 2023-10-31 00:15 ALAS2LIVEPATCH-2023-152
Amazon Linux 2 - Livepatch Extra kernel-livepatch-4.14.322-244.539 2023-10-31 00:15 ALAS2LIVEPATCH-2023-153
Amazon Linux 2 - Livepatch Extra kernel-livepatch-4.14.322-246.539 2023-10-31 00:15 ALAS2LIVEPATCH-2023-151
Amazon Linux 2 - Livepatch Extra kernel-livepatch-5.10.186-179.751 2023-10-31 00:16 ALAS2LIVEPATCH-2023-155
Amazon Linux 2 - Livepatch Extra kernel-livepatch-5.10.192-182.736 2023-10-31 00:15 ALAS2LIVEPATCH-2023-150
Amazon Linux 2 - Livepatch Extra kernel-livepatch-5.10.192-183.736 2023-10-31 00:14 ALAS2LIVEPATCH-2023-149
Amazon Linux 2023 kernel-livepatch-6.1.49-69.116 2023-12-06 07:53 ALAS2023LIVEPATCH-2023-025
Amazon Linux 2023 kernel-livepatch-6.1.49-70.116 2023-12-06 07:53 ALAS2023LIVEPATCH-2023-026
Amazon Linux 2023 kernel-livepatch-6.1.52-71.125 2023-12-06 07:53 ALAS2023LIVEPATCH-2023-024

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD CVSSv3 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H