# CVE-2025-68324: scsi: imm: Fix use-after-free bug caused by unfinished delayed work

> A use-after-free vulnerability in the Linux kernel's IMM SCSI driver allows local attackers to cause a denial of service or potentially execute code via a race condition during device detachment.

- **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:** 18 Dec 2025
- **Updated:** 21 Oct 2026
- **Also known as:** AZL-72742, BELL-CVE-2025-68324, DEBIAN-CVE-2025-68324, GHSA-v78j-7qmc-c42v, ROOT-OS-DEBIAN-11-CVE-2025-68324, ROOT-OS-DEBIAN-12-CVE-2025-68324, ROOT-OS-DEBIAN-13-CVE-2025-68324, ROOT-OS-UBUNTU-2204-CVE-2025-68324, ROOT-OS-UBUNTU-2404-CVE-2025-68324, UBUNTU-CVE-2025-68324

## What is CVE-2025-68324?

CVE-2025-68324 is an use after free vulnerability in Linux, published on 18 Dec 2025. 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:

scsi: imm: Fix use-after-free bug caused by unfinished delayed work

The delayed work item 'imm_tq' is initialized in imm_attach() and
scheduled via imm_queuecommand() for processing SCSI commands.  When the
IMM parallel port SCSI host adapter is detached through imm_detach(),
the imm_struct device instance is deallocated.

However, the delayed work might still be pending or executing
when imm_detach() is called, leading to use-after-free bugs
when the work function imm_interrupt() accesses the already
freed imm_struct memory.

The race condition can occur as follows:

CPU 0(detach thread)   | CPU 1
                       | imm_queuecommand()
                       |   imm_queuecommand_lck()
imm_detach()           |     schedule_delayed_work()
  kfree(dev) //FREE    | imm_interrupt()
                       |   dev = container_of(...) //USE
                           dev-> //USE

Add disable_delayed_work_sync() in imm_detach() to guarantee proper
cancellation of the delayed work item before imm_struct is deallocated.

## Which versions are affected by CVE-2025-68324?


## How do I fix CVE-2025-68324?

Apply the vendor's patch.

## Is CVE-2025-68324 being exploited?

There is no known exploitation of CVE-2025-68324 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-68324 and fix it if it is affected.

What it is: CVE-2025-68324 is an use after free vulnerability in Linux, published on 18 Dec 2025. 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-2025-68324 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-2025-68324/ (Markdown: https://insights.sbomify.com/CVE-2025-68324/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-68324
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-68324
- OSV: https://osv.dev/vulnerability/CVE-2025-68324

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-68324/
Summaries are generated and may contain mistakes; the official description above is the record.