CVE-2026-53343
ARM: 9475/1: entry: use byte load for KASAN VMAP stack shadow
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.
INFO
Published Date :
July 1, 2026, 2:16 p.m.
Last Modified :
July 23, 2026, 9:32 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Apply the kernel commit that uses ldrb for shadow access.
- Ensure kernel is updated to include the fix.
- Test for alignment exceptions after applying the patch.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-53343.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-53343 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-53343
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-53343 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-53343 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 23, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.36 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.13 *cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc7:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.1.120 up to (excluding) 6.1.176 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.12.4 up to (excluding) 6.12.94 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.6.64 up to (excluding) 6.6.143 Added Reference Type kernel.org: https://git.kernel.org/stable/c/2a4dc9a0ac3326e79fb58fdaae724b92127709a9 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/517720913bd3c17a52cd55a740064f68455ab88e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c0b8c148a7754826156993ed6442d31536ec86b4 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c2e3aadc8fef7da068490597fc5582f8f362aeb2 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c74990828d3c486ee44aaa68240eb3abff289d1c Types: Patch -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 01, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '8fe148d39c127de3fb78dfa6da95a3608dfda454', 'lessThan': 'c0b8c148a7754826156993ed6442d31536ec86b4', 'versionType': 'git'}, {'status': 'affected', 'version': 'ef21187c0672a2b2cbec44f33bab9ec47d5c277c', 'lessThan': 'c2e3aadc8fef7da068490597fc5582f8f362aeb2', 'versionType': 'git'}, {'status': 'affected', 'version': 'c86d26b4b089ca294b3b7d915a7da61edb77935f', 'lessThan': 'c74990828d3c486ee44aaa68240eb3abff289d1c', 'versionType': 'git'}, {'status': 'affected', 'version': '44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2', 'lessThan': '517720913bd3c17a52cd55a740064f68455ab88e', 'versionType': 'git'}, {'status': 'affected', 'version': '44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2', 'lessThan': '2a4dc9a0ac3326e79fb58fdaae724b92127709a9', 'versionType': 'git'}, {'status': 'affected', 'version': '44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2', 'lessThan': '77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6', 'versionType': 'git'}, {'status': 'affected', 'version': '6.1.120', 'lessThan': '6.1.176', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.6.64', 'lessThan': '6.6.143', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.12.4', 'lessThan': '6.12.94', 'versionType': 'semver'}], 'programFiles': ['arch/arm/kernel/entry-armv.S'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.13'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.13', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.1.176', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.143', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.94', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.36', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.13', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['arch/arm/kernel/entry-armv.S'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/2a4dc9a0ac3326e79fb58fdaae724b92127709a9 Added Reference https://git.kernel.org/stable/c/517720913bd3c17a52cd55a740064f68455ab88e Added Reference https://git.kernel.org/stable/c/77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6 Added Reference https://git.kernel.org/stable/c/c0b8c148a7754826156993ed6442d31536ec86b4 Added Reference https://git.kernel.org/stable/c/c2e3aadc8fef7da068490597fc5582f8f362aeb2 Added Reference https://git.kernel.org/stable/c/c74990828d3c486ee44aaa68240eb3abff289d1c