In the Linux kernel, the following vulnerability has been resolved:
ARM: 9475/1: entry: use byte load for KASAN VMAP stack shadow
Commit 44e9a3bb76e5 ("ARM: 9430/1: entry: Do a dummy read from VMAP shadow") added a dummy read from the KASAN VMAP stack shadow in __switch_to(). The read uses ldr, but the KASAN shadow address is byte-granular and is not guaranteed to be word aligned.
ARMv5 faults unaligned word loads. With CONFIG_KASAN_VMALLOC and CONFIG_VMAP_STACK enabled, ARM926/VersatilePB crashes in __switch_to() with an alignment exception before reaching init.
Use ldrb for the dummy shadow access. The code only needs to fault in the shadow mapping if the stack shadow is missing, so a byte load is sufficient and matches the granularity of KASAN shadow memory.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux-6.1Upgrade linux | Jul 5, 2026 | Jul 5, 2026 |
| Ubuntu | — | Upgrade linux-image-generic-7.0Upgrade linux-image-gke-64kUpgrade linux-image-generic-64k-7.0Upgrade linux-image-nvidia-7.0Upgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-7.0.0-1012-aws-64kUpgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-7.0.0-1012-awsUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-oracle-64kUpgrade linux-image-7.0.0-31-genericUpgrade linux-image-realtimeUpgrade linux-image-raspi-7.0Upgrade linux-image-azureUpgrade linux-image-azure-7.0Upgrade linux-image-nvidia-64kUpgrade linux-image-7.0.0-1019-raspi-realtimeUpgrade linux-image-7.0.0-2018-nvidia-bosUpgrade linux-image-7.0.0-1006-gke-64kUpgrade linux-image-generic-64kUpgrade linux-image-gke-7.0Upgrade linux-image-oem-7.0Upgrade linux-image-realtime-hwe-26.04Upgrade linux-image-gke-64k-7.0Upgrade linux-image-gcp-64k-7.0Upgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-raspiUpgrade linux-image-7.0.0-31-generic-64kUpgrade linux-image-7.0.0-1018-nvidia-64kUpgrade linux-image-raspi-realtime-7.0Upgrade linux-image-oem-26.04Upgrade linux-image-7.0.0-1014-azureUpgrade linux-image-realtime-64kUpgrade linux-image-nvidia-bosUpgrade linux-image-7.0.0-1011-oracle-64kUpgrade linux-image-gcp-64kUpgrade linux-image-awsUpgrade linux-image-aws-7.0Upgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-7.0.0-1018-nvidiaUpgrade linux-image-generic-hwe-26.04Upgrade linux-image-nvidia-bos-7.0Upgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-nvidia-bos-64kUpgrade linux-image-oem-26.04aUpgrade linux-image-oracle-64k-7.0Upgrade linux-image-virtual-hwe-26.04Upgrade linux-image-virtual-7.0Upgrade linux-image-7.0.0-1019-raspiUpgrade linux-image-genericUpgrade linux-image-gcp-7.0Upgrade linux-image-oracle-7.0Upgrade linux-image-oracleUpgrade linux-image-gkeUpgrade linux-image-aws-64k-7.0Upgrade linux-image-7.0.0-1006-gkeUpgrade linux-image-raspi-realtimeUpgrade linux-image-realtime-64k-7.0Upgrade linux-image-nvidia-64k-7.0Upgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-azure-lts-26.04Upgrade linux-image-7.0.0-31-realtimeUpgrade linux-image-7.0.0-2018-nvidia-bos-64kUpgrade linux-image-7.0.0-1011-oracleUpgrade linux-image-nvidiaUpgrade linux-image-gke-hwe-26.04Upgrade linux-image-virtualUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-realtime-7.0Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-7.0.0-1013-ibmUpgrade linux-image-ibm-7.0Upgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-gcpUpgrade linux-image-oem-26.04bUpgrade linux-image-ibmUpgrade linux-image-aws-64kUpgrade linux-image-7.0.0-31-realtime-64kUpgrade linux-image-7.0.0-1013-oem | Sep 14, 2026 | Sep 7, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jul 28, 2026 | Jul 1, 2026 |
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