CVE-2021-33200
High
Description
kernel/bpf/verifier.c in the Linux kernel through 5.12.7 enforces incorrect limits for pointer arithmetic operations, aka CID-bb01a1bba579. This can be abused to perform out-of-bounds reads and writes in kernel memory, leading to local privilege escalation to root. In particular, there is a corner case where the off reg causes a masking direction change, which then results in an incorrect final aux->alu_limit.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Linux Kernel
PublishedMay 27, 2021
First seenMay 27, 2021
How to fix
Update
- linux linux_kernel5.4.123, 5.10.41, 5.12.8 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 5.4.116 ≤ v < 5.4.123, 5.10.33 ≤ v < 5.10.41, 5.11.17 ≤ v < 5.12.8 | 5.4.123, 5.10.41, 5.12.8 |
| fedoraproject fedora | 33, 34 | — |
| netapp cloud_backup | No range specified | — |
| netapp solidfire_\&_hci_management_node | No range specified | — |
| netapp solidfire_baseboard_management_controller | No range specified | — |
| netapp h300s_firmware | No range specified | — |
| netapp h500s_firmware | No range specified | — |
| netapp h300e_firmware | No range specified | — |
| netapp h500e_firmware | No range specified | — |
| netapp h700e_firmware | No range specified | — |
| netapp h410s_firmware | No range specified | — |
| netapp h700s_firmware | No range specified | — |
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