CVE-2022-42324

Description

Oxenstored 32->31 bit integer truncation issues Integers in Ocaml are 63 or 31 bits of signed precision. The Ocaml Xenbus library takes a C uint32_t out of the ring and casts it directly to an Ocaml integer. In 64-bit Ocaml builds this is fine, but in 32-bit builds, it truncates off the most significant bit, and then creates unsigned/signed confusion in the remainder. This in turn can feed a negative value into logic not expecting a negative value, resulting in unexpected exceptions being thrown. The unexpected exception is not handled suitably, creating a busy-loop trying (and failing) to take the bad packet out of the xenstore ring.

How to fix CVE-2022-42324

To remediate CVE-2022-42324, upgrade the affected package to a fixed version below.

• —upgrade to 4.15.4-r0 or later
• —upgrade to 4.14.5+86-g1c354767d5-1 or later

Is CVE-2022-42324 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 4.15.4-r0
• from 0, < 4.14.5+86-g1c354767d5-1

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2022-42324
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2022-42324