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.
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Ubuntu | — | Upgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-6.17.0-1007-awsUpgrade linux-image-6.17.0-14-generic-64kUpgrade linux-image-oem-22.04bUpgrade linux-image-oracle-6.17Upgrade linux-image-6.8.0-1050-aws-fipsUpgrade linux-image-6.17.0-1007-oracleUpgrade linux-image-awsUpgrade linux-image-azure-fipsUpgrade linux-image-generic-6.17Upgrade linux-image-gkeop-6.8Upgrade linux-image-6.8.0-1047-oracle-64kUpgrade linux-image-azure-6.8Upgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-aws-fips-6.8Upgrade linux-image-aws-lts-24.04Upgrade linux-image-intel-iot-realtimeUpgrade linux-image-kvmUpgrade linux-image-6.17.0-1006-realtimeUpgrade linux-image-6.8.0-1049-nvidia-lowlatencyUpgrade linux-image-oracle-64k-6.8Upgrade linux-image-raspi-6.17Upgrade linux-image-fips-6.8Upgrade linux-image-gcpUpgrade linux-image-gcp-6.17Upgrade linux-image-6.17.0-1008-azureUpgrade linux-image-raspi-realtimeUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-ibm-6.8Upgrade linux-image-6.8.0-1048-gke-64kUpgrade linux-image-nvidia-64kUpgrade linux-image-6.17.0-1007-aws-64kUpgrade linux-image-gcp-6.8Upgrade linux-image-gcp-lts-24.04Upgrade linux-image-gke-6.8Upgrade linux-image-6.8.0-1052-azure-fipsUpgrade linux-image-aws-64k-6.8Upgrade linux-image-azure-fips-6.8Upgrade linux-image-oracle-6.8Upgrade linux-image-generic-64k-6.8Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-6.8.0-106-genericUpgrade linux-image-xilinxUpgrade linux-image-azure-lts-24.04Upgrade linux-image-aws-64kUpgrade linux-image-generic-6.8Upgrade linux-image-6.8.0-106-fipsUpgrade linux-image-gke-64k-6.8Upgrade linux-image-6.8.0-1052-gcpUpgrade linux-image-ibmUpgrade linux-image-6.17.0-1007-gcpUpgrade linux-image-6.8.0-1050-awsUpgrade linux-image-oem-6.17Upgrade linux-image-virtualUpgrade linux-image-ibm-classicUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-oem-22.04aUpgrade linux-image-oem-22.04cUpgrade linux-image-oracle-64kUpgrade linux-image-realtime-6.17Upgrade linux-image-6.17.0-1008-raspiUpgrade linux-image-virtual-6.17Upgrade linux-image-6.8.0-106-generic-64kUpgrade linux-image-gcp-fips-6.8Upgrade linux-image-realtime-hwe-22.04Upgrade linux-image-6.8.0-1047-oracleUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-lowlatencyUpgrade linux-image-6.8.0-106-lowlatency-64kUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-6.17.0-1007-gcp-64kUpgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-raspi-6.8Upgrade linux-image-oracle-64k-6.17Upgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-gcp-fipsUpgrade linux-image-6.8.0-1048-gkeUpgrade linux-image-oracle-lts-24.04Upgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-xilinx-6.8Upgrade linux-image-oracleUpgrade linux-image-gkeopUpgrade linux-image-gcp-64kUpgrade linux-image-6.17.0-1011-oemUpgrade linux-image-raspi-realtime-6.8Upgrade linux-image-oem-22.04Upgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-6.8.0-106-lowlatencyUpgrade linux-image-aws-6.17Upgrade linux-image-6.8.0-1029-xilinxUpgrade linux-image-6.17.0-1007-oracle-64kUpgrade linux-image-6.17.0-14-genericUpgrade linux-image-realtime-6.8.1Upgrade linux-image-gcp-64k-6.17Upgrade linux-image-6.8.0-1050-aws-64kUpgrade linux-image-raspiUpgrade linux-image-intel-iotgUpgrade linux-image-gkeUpgrade linux-image-azure-6.17Upgrade linux-image-aws-64k-6.17Upgrade linux-image-6.8.1-1045-realtimeUpgrade linux-image-6.8.0-1052-gcp-64kUpgrade linux-image-6.8.0-1051-azureUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-nvidiaUpgrade linux-image-virtual-6.8Upgrade linux-image-6.8.0-2040-raspi-realtimeUpgrade linux-image-lowlatency-64kUpgrade linux-image-6.8.0-1050-raspiUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-nvidia-6.8Upgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-generic-64kUpgrade linux-image-6.8.0-1052-gcp-fipsUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-gcp-64k-6.8Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-generic-lpaeUpgrade linux-image-6.8.0-1049-nvidia-lowlatency-64kUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-lowlatency-6.8Upgrade linux-image-6.8.0-1049-nvidia-64kUpgrade linux-image-realtimeUpgrade linux-image-6.8.0-1049-ibmUpgrade linux-image-aws-fipsUpgrade linux-image-gke-64kUpgrade linux-image-oem-22.04dUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-generic-64k-6.17Upgrade linux-image-genericUpgrade linux-image-azureUpgrade linux-image-6.8.0-1049-nvidiaUpgrade linux-image-fipsUpgrade linux-image-aws-6.8Upgrade linux-image-6.8.0-1035-gkeop | Feb 13, 2026 | Feb 12, 2026 |
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