# CVE-2026-68324: iommu/intel: Fix out-of-bounds memset in dmar_latency_disable()

> An out-of-bounds memory write in the Intel IOMMU driver allows local attackers to corrupt kernel memory, potentially leading to privilege escalation or system crashes.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 10 Aug 2026
- **Updated:** 19 Aug 2026
- **Also known as:** BELL-CVE-2026-68324, DEBIAN-CVE-2026-68324, GHSA-hrwq-83vm-hr68, UBUNTU-CVE-2026-68324

## What is CVE-2026-68324?

CVE-2026-68324 is a memory corruption vulnerability in Linux, published on 10 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In the Linux kernel, the following vulnerability has been resolved:

iommu/intel: Fix out-of-bounds memset in dmar_latency_disable()

dmar_latency_disable() intends to zero out only the single
latency_statistic entry for the given type, but the memset size was
computed as sizeof(*lstat) * DMAR_LATENCY_NUM, which clears the entire
array starting from &lstat[type].

When type > 0, this writes beyond the end of the allocated array,
corrupting adjacent memory.

Fix by using sizeof(*lstat) to clear only the target entry.

## Which versions are affected by CVE-2026-68324?


## How do I fix CVE-2026-68324?

Apply the vendor's patch.

## Is CVE-2026-68324 being exploited?

There is no known exploitation of CVE-2026-68324 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-68324 and fix it if it is affected.

What it is: CVE-2026-68324 is a memory corruption vulnerability in Linux, published on 10 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-68324 in the wild and no public exploit code.

Affected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-68324/ (Markdown: https://insights.sbomify.com/CVE-2026-68324/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-68324
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-68324
- OSV: https://osv.dev/vulnerability/CVE-2026-68324

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-68324/
Summaries are generated and may contain mistakes; the official description above is the record.