Public on 2023-09-12
Modified on 2024-03-01
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.
Important severity
CVSS v3 Base Score
See breakdown

Affected Packages

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

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