Vulnerability Description
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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.1.120, < 6.1.176 |
References
- https://git.kernel.org/stable/c/2a4dc9a0ac3326e79fb58fdaae724b92127709a9Patch
- https://git.kernel.org/stable/c/517720913bd3c17a52cd55a740064f68455ab88ePatch
- https://git.kernel.org/stable/c/77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6Patch
- https://git.kernel.org/stable/c/c0b8c148a7754826156993ed6442d31536ec86b4Patch
- https://git.kernel.org/stable/c/c2e3aadc8fef7da068490597fc5582f8f362aeb2Patch
- https://git.kernel.org/stable/c/c74990828d3c486ee44aaa68240eb3abff289d1cPatch
FAQ
What is CVE-2026-53343?
CVE-2026-53343 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 ...
How severe is CVE-2026-53343?
CVE-2026-53343 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-53343?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.