CVE-2020-8835
Description
In the Linux kernel 5.5.0 and newer, the bpf verifier (kernel/bpf/verifier.c) did not properly restrict the register bounds for 32-bit operations, leading to out-of-bounds reads and writes in kernel memory. The vulnerability also affects the Linux 5.4 stable series, starting with v5.4.7, as the introducing commit was backported to that branch. This vulnerability was fixed in 5.6.1, 5.5.14, and 5.4.29. (issue is aka ZDI-CAN-10780)
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2020-8835
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2020-8835.html
Vendor advisory: arch — https://security.archlinux.org/ASA-202004-2
Vendor advisory: arch — https://security.archlinux.org/ASA-202004-3
Vendor advisory: arch — https://security.archlinux.org/ASA-202004-4
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| arch | fixed | 5.5.13.arch2-1 | |
| sles | affected | | |
| debian | bookworm | fixed | 5.5.13-2 |
| debian | bullseye | fixed | 5.5.13-2 |
| debian | forky | fixed | 5.5.13-2 |
| debian | sid | fixed | 5.5.13-2 |
| debian | trixie | fixed | 5.5.13-2 |
References
Verify integrity in audit chain (admin only). AS-IS.