CVE-2021-34556
medium
CVSS v3
—
CVSS v2
—
VIR risk
5.5
Description
In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack because the protection mechanism neglects the possibility of uninitialized memory locations on the BPF stack.
Predictions
Exploit likelihood
20%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-34556
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-34556.html
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| arch | fixed | 5.13.13.hardened1-1 | |
| sles | affected | | |
| debian | bookworm | fixed | 5.10.46-4 |
| debian | bullseye | fixed | 5.10.46-4 |
| debian | forky | fixed | 5.10.46-4 |
| debian | sid | fixed | 5.10.46-4 |
| debian | trixie | fixed | 5.10.46-4 |
References
Verify integrity in audit chain (admin only). AS-IS.