# CVE-2026-98814: nvme: fix command effects log lifetime for multipath heads

> A use-after-free in the Linux kernel NVMe driver allows local attackers to cause a system crash or potentially execute code via I/O passthrough commands.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 18 Oct 2026
- **Updated:** 19 Oct 2026
- **Also known as:** AZL-108890, BELL-CVE-2026-98814, DEBIAN-CVE-2026-98814, GHSA-pjx2-xpm7-hwm6, UBUNTU-CVE-2026-98814

## What is CVE-2026-98814?

CVE-2026-98814 is an use after free vulnerability in Linux, published on 18 Oct 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:

nvme: fix command effects log lifetime for multipath heads

KASAN reported a use-after-free when an I/O passthrough command was sent
through a multipath namespace head after the controller path that first
created the head had been removed:

  BUG: KASAN: slab-use-after-free in nvme_command_effects+0x192/0x200 [nvme_core]
  Read of size 4 at addr ffff888141b14400 by task nvme/19811
  nvme_command_effects+0x192/0x200 [nvme_core]
  nvme_cmd_allowed+0x7e/0x1b0 [nvme_core]
  nvme_user_cmd.constprop.0+0x1b5/0x450 [nvme_core]
  nvme_ns_head_chr_ioctl+0xf4/0x2a0 [nvme_core]

Move the log cache to the subsystem, with one entry per command set. Both
controllers and namespace heads hold subsystem references, keeping their
log pointers valid until subsystem release.

## Which versions are affected by CVE-2026-98814?


## How do I fix CVE-2026-98814?

Apply the vendor's patch.

## Is CVE-2026-98814 being exploited?

There is no known exploitation of CVE-2026-98814 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-98814 and fix it if it is affected.

What it is: CVE-2026-98814 is an use after free vulnerability in Linux, published on 18 Oct 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-2026-98814 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-2026-98814/ (Markdown: https://insights.sbomify.com/CVE-2026-98814/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-98814
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-98814
- OSV: https://osv.dev/vulnerability/CVE-2026-98814

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-98814/
Summaries are generated and may contain mistakes; the official description above is the record.