CVE-2026-53343

ARM: 9475/1: entry: use byte load for KASAN VMAP stack shadow

State: Published
Severity: Not scored
Published: Jul 1, 2026
Updated: Jul 1, 2026
Reserved: Jun 9, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	8fe148d39c127de3fb78dfa6da95a3608dfda454 to before c0b8c148a7754826156993ed6442d31536ec86b4Affected ef21187c0672a2b2cbec44f33bab9ec47d5c277c to before c2e3aadc8fef7da068490597fc5582f8f362aeb2Affected c86d26b4b089ca294b3b7d915a7da61edb77935f to before c74990828d3c486ee44aaa68240eb3abff289d1cAffected 44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2 to before 517720913bd3c17a52cd55a740064f68455ab88eAffected 44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2 to before 2a4dc9a0ac3326e79fb58fdaae724b92127709a9Affected 44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2 to before 77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6Affected 6.1.120 to before 6.1.176Affected 6.6.64 to before 6.6.143Affected 6.12.4 to before 6.12.94Affected
LinuxLinux	6.13Affected before 6.13Not affected 6.1.176 through 6.1.Not affected 6.6.143 through 6.6.Not affected 6.12.94 through 6.12.Not affected 6.18.36 through 6.18.Not affected 7.0.13 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

8fe148d39c127de3fb78dfa6da95a3608dfda454 to before c0b8c148a7754826156993ed6442d31536ec86b4Affected
ef21187c0672a2b2cbec44f33bab9ec47d5c277c to before c2e3aadc8fef7da068490597fc5582f8f362aeb2Affected
c86d26b4b089ca294b3b7d915a7da61edb77935f to before c74990828d3c486ee44aaa68240eb3abff289d1cAffected
44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2 to before 517720913bd3c17a52cd55a740064f68455ab88eAffected
44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2 to before 2a4dc9a0ac3326e79fb58fdaae724b92127709a9Affected
44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2 to before 77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6Affected
6.1.120 to before 6.1.176Affected
6.6.64 to before 6.6.143Affected
6.12.4 to before 6.12.94Affected

LinuxLinux

6.13Affected
before 6.13Not affected
6.1.176 through 6.1.*Not affected
6.6.143 through 6.6.*Not affected
6.12.94 through 6.12.*Not affected
6.18.36 through 6.18.*Not affected
7.0.13 through 7.0.*Not affected
7.1 and laterNot affected

References

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