PT-2024-26768 · Linux+9 · Linux Kernel+9
Published
2024-05-19
·
Updated
2026-04-20
·
CVE-2024-35875
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
The issue is related to the Linux kernel's random number generator (RNG) on CoCo systems. The CoCo threat model means that the VM host cannot be trusted and may actively work against guests to extract secrets or manipulate computation. Since a malicious host can modify or observe nearly all inputs to guests, the only remaining source of entropy for CoCo guests is RDRAND. If RDRAND is broken due to a CPU hardware fault, the RNG as a whole is meant to continue gathering entropy from other sources, but since there are no other sources on CoCo, this is catastrophic. This is mostly a concern at boot time when initially seeding the RNG. The kernel now tries to seed the RNG using 256 bits of RDRAND output at boot, and if this fails, it panics.
Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
RCE
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Weakness Enumeration
Related Identifiers
Affected Products
Almalinux
Astra Linux
Debian
Linuxmint
Linux Kernel
Red Hat
Red Os
Rocky Linux
Suse
Ubuntu