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

CVE-2025-68322 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-68322, released December 16, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-68322
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 16, 2025
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-68322

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.63-1 | [DEBIAN-CVE-2025-68322](https://patchblox.com/security/data/fix/linux/debian-cve-2025-68322.md) | Dec 16, 2025 |
| Linux | linux Debian 14 | 6.17.8-1 | [DEBIAN-CVE-2025-68322](https://patchblox.com/security/data/fix/linux/debian-cve-2025-68322.md) | Dec 16, 2025 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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