Memory corruption in Linux kernel - CVE-2026-53343
Published: July 2, 2026
Vulnerability identifier: #VU136706
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-53343
CWE-ID: CWE-119
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local attacker to cause a denial of service.
The vulnerability exists due to improper memory access in __switch_to() when performing a dummy read from the KASAN VMAP stack shadow. A local attacker can trigger execution on an affected ARM system to cause a denial of service.
Only ARM systems with CONFIG_KASAN_VMALLOC and CONFIG_VMAP_STACK enabled are affected, and the issue can cause an alignment exception before reaching init.
How to mitigate CVE-2026-53343
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/2a4dc9a0ac3326e79fb58fdaae724b92127709a9
- https://git.kernel.org/stable/c/517720913bd3c17a52cd55a740064f68455ab88e
- https://git.kernel.org/stable/c/77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6
- https://git.kernel.org/stable/c/c0b8c148a7754826156993ed6442d31536ec86b4
- https://git.kernel.org/stable/c/c2e3aadc8fef7da068490597fc5582f8f362aeb2
- https://git.kernel.org/stable/c/c74990828d3c486ee44aaa68240eb3abff289d1c