# CVE-2025-68322: parisc: Avoid crash due to unaligned access in unwinder

> A local attacker can cause a kernel deadlock and system crash on PA-RISC architectures by triggering unaligned memory access in the stack unwinder.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Not stated
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 16 Dec 2025
- **Updated:** 11 May 2026
- **Also known as:** BELL-CVE-2025-68322, DEBIAN-CVE-2025-68322, GHSA-5cpg-hfmf-h5fh, ROOT-OS-DEBIAN-11-CVE-2025-68322, ROOT-OS-DEBIAN-12-CVE-2025-68322, ROOT-OS-DEBIAN-13-CVE-2025-68322, ROOT-OS-UBUNTU-2204-CVE-2025-68322, ROOT-OS-UBUNTU-2404-CVE-2025-68322, UBUNTU-CVE-2025-68322

## What is CVE-2025-68322?

CVE-2025-68322 is a denial of service vulnerability in Linux, published on 16 Dec 2025. 

### Official description

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

parisc: Avoid crash due to unaligned access in unwinder

Guenter Roeck reported this kernel crash on his emulated B160L machine:

Starting network: udhcpc: started, v1.36.1
 Backtrace:
  [<104320d4>] unwind_once+0x1c/0x5c
  [<10434a00>] walk_stackframe.isra.0+0x74/0xb8
  [<10434a6c>] arch_stack_walk+0x28/0x38
  [<104e5efc>] stack_trace_save+0x48/0x5c
  [<105d1bdc>] set_track_prepare+0x44/0x6c
  [<105d9c80>] ___slab_alloc+0xfc4/0x1024
  [<105d9d38>] __slab_alloc.isra.0+0x58/0x90
  [<105dc80c>] kmem_cache_alloc_noprof+0x2ac/0x4a0
  [<105b8e54>] __anon_vma_prepare+0x60/0x280
  [<105a823c>] __vmf_anon_prepare+0x68/0x94
  [<105a8b34>] do_wp_page+0x8cc/0xf10
  [<105aad88>] handle_mm_fault+0x6c0/0xf08
  [<10425568>] do_page_fault+0x110/0x440
  [<10427938>] handle_interruption+0x184/0x748
  [<11178398>] schedule+0x4c/0x190
  BUG: spinlock recursion on CPU#0, ifconfig/2420
  lock: terminate_lock.2+0x0/0x1c, .magic: dead4ead, .owner: ifconfig/2420, .owner_cpu: 0

While creating the stack trace, the unwinder uses the stack pointer to guess
the previous frame to read the previous stack pointer from memory.  The crash
happens, because the unwinder tries to read from unaligned memory and as such
triggers the unalignment trap handler which then leads to the spinlock
recursion and finally to a deadlock.

Fix it by checking the alignment before accessing the memory.

## Which versions are affected by CVE-2025-68322?


## How do I fix CVE-2025-68322?

Apply the vendor's patch.

## Is CVE-2025-68322 being exploited?

There is no known exploitation of CVE-2025-68322 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-68322 and fix it if it is affected.

What it is: CVE-2025-68322 is a denial of service vulnerability in Linux, published on 16 Dec 2025. 
Exploitation: There is no known exploitation of CVE-2025-68322 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-2025-68322/ (Markdown: https://insights.sbomify.com/CVE-2025-68322/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-68322
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-68322
- OSV: https://osv.dev/vulnerability/CVE-2025-68322

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-68322/
Summaries are generated and may contain mistakes; the official description above is the record.