Medium 5.5Published Jul 1, 2026

CVE-2026-53343ARM: 9475/1: entry: use byte load for KASAN VMAP stack shadow

Updated under an hour ago (Oct 26, 2026, 5:00 PM ET)

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Exploited in the last 30 days

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: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Jul 1, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 8fe148d39c127de3fb78dfa6da95a3608dfda454 before c0b8c148a7754826156993ed6442d31536ec86b4; from ef21187c0672a2b2cbec44f33bab9ec47d5c277c before c2e3aadc8fef7da068490597fc5582f8f362aeb2; from c86d26b4b089ca294b3b7d915a7da61edb77935f before c74990828d3c486ee44aaa68240eb3abff289d1c; from 44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2 before 517720913bd3c17a52cd55a740064f68455ab88e; 44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2 builds before 2a4dc9a0ac3326e79fb58fdaae724b92127709a9; from 44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2 before 77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6; from 6.1.120 before 6.1.176; from 6.6.64 before 6.6.143; and 1 more ranges	CNA record
linux linux_kernel linux:linux_kernel	from 6.1.120 before 6.1.176; from 6.6.64 before 6.6.143; from 6.12.4 before 6.12.94; from 6.13 before 6.18.36; from 6.19 before 7.0.13; 7.1; 7.1; 7.1; and 4 more ranges	NVD

References

References

https://git.kernel.org/stable/c/c0b8c148a7754826156993ed6442d31536ec86b4	patch
https://git.kernel.org/stable/c/c2e3aadc8fef7da068490597fc5582f8f362aeb2	patch
https://git.kernel.org/stable/c/c74990828d3c486ee44aaa68240eb3abff289d1c	patch
https://git.kernel.org/stable/c/517720913bd3c17a52cd55a740064f68455ab88e	patch
https://git.kernel.org/stable/c/2a4dc9a0ac3326e79fb58fdaae724b92127709a9	patch
https://git.kernel.org/stable/c/77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.