CVE-2026-53333
Received Received - Intake

Memory Corruption in Linux Kernel mm/mincore

Publication date: 2026-07-01

Last updated on: 2026-07-01

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: mm/mincore: handle non-swap entries before !CONFIG_SWAP guard mincore_swap() also fields migration/hwpoison entries (and shmem swapin-error entries), which can exist on !CONFIG_SWAP builds when CONFIG_MIGRATION or CONFIG_MEMORY_FAILURE is enabled. The !IS_ENABLED(CONFIG_SWAP) guard ran before the non-swap-entry early return, so mincore_pte_range() can spuriously WARN and report these pages nonresident on !CONFIG_SWAP kernels. Move the guard below the non-swap-entry check so only true swap entries trip the WARN, and migration/hwpoison entries take the existing "uptodate / non-shmem" path.

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Meta Information

Published
2026-07-01
Last Modified
2026-07-01
Generated
2026-07-01
AI Q&A
2026-07-01
EPSS Evaluated
N/A
NVD
CVE-2026-53333
EUVD
EUVD-2026-40967

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability relates to the Linux kernel's memory management code, specifically the handling of non-swap entries in the mincore function. The issue arises because the check for whether swap is enabled (!CONFIG_SWAP) was performed before handling certain types of memory entries such as migration, hardware poison, and shmem swapin-error entries. As a result, the function could incorrectly warn and report these pages as nonresident on kernels where swap is disabled. The fix involved moving the swap-enabled guard to after the non-swap-entry check, ensuring only true swap entries trigger warnings, while other entries follow the correct processing path.

Impact Analysis

This vulnerability can cause the Linux kernel to incorrectly warn about certain memory pages being nonresident when swap is disabled. This may lead to misleading kernel warnings and potentially affect system stability or debugging processes. However, there is no indication that this vulnerability leads to security breaches such as privilege escalation or data corruption.

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