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.
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 |
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 |