CVE-2023-34324 — Closing of an event channel in the Linux kernel can result in a deadlock

Closing of an event channel in the Linux kernel can result in a deadlock. This happens when the close is being performed in parallel to an unrelated Xen console action and the handling of a Xen console interrupt in an unprivileged guest.

01What is this vulnerability?

Closing of an event channel in the Linux kernel can result in a deadlock. This happens when the close is being performed in parallel to an unrelated Xen console action and the handling of a Xen console interrupt in an unprivileged guest.

02Affected products

Vendor	Product	Versions
Linux	Linux	consult Xen advisory XSA-441

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2024-01-05T16:30:45.807Z
• Last modified: 2025-11-04T19:16:37.667Z

09References

• xenbits.xenproject.org — https://xenbits.xenproject.org/xsa/advisory-441.html
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2024/01/msg00005.html