A vulnerability was discovered in retrieve_ptr_limit in kernel/bpf/verifier.c in the Linux kernel mechanism to mitigate speculatively out-of-bounds loads (Spectre mitigation). In this flaw a local, special user privileged (CAP_SYS_ADMIN) BPF program running on affected systems may bypass the protection, and execute speculatively out-of-bounds loads from the kernel memory. This can be abused to extract contents of kernel memory via side-channel.
Platform | Package | Release Date | Advisory |
---|---|---|---|
Amazon Linux 1 | kernel | 2021-05-20 21:12 | ALAS-2021-1503 |
Amazon Linux 2 - Core | kernel | 2021-05-20 15:51 | ALAS2-2021-1636 |
Amazon Linux 2 - Kernel-5.10 Extra | kernel | 2022-01-20 23:18 | ALAS2KERNEL-5.10-2022-001 |
Amazon Linux 2 - Kernel-5.4 Extra | kernel | 2022-01-12 00:00 | ALAS2KERNEL-5.4-2022-003 |
Score Type | Score | Vector | |
---|---|---|---|
Amazon Linux | CVSSv3 | 4.4 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N |
NVD | CVSSv2 | 2.1 | AV:L/AC:L/Au:N/C:P/I:N/A:N |
NVD | CVSSv3 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |