CVE-2026-53335
Received Received - Intake

NULL Pointer Dereference in Linux Kernel DAMON LRU Sort

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/damon/lru_sort: handle ctx allocation failure DAMON_LRU_SORT allocates the damon_ctx object for its kdamond in its init function. damon_lru_sort_enabled_store() wrongly assumes the allocation will always succeed once tried. If the damon_ctx allocation was failed, therefore, code execution reaches to damon_commit_ctx() while 'ctx' is NULL. As a result, it dereferences the NULL 'ctx' pointer. Avoid the NULL dereference by returning -ENOMEM if 'ctx' is NULL.

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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-2026-53335
EUVD
EUVD-2026-40969

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 exists in the Linux kernel's DAMON_LRU_SORT feature, specifically in the handling of the damon_ctx object allocation for its kdamond during initialization.

The damon_lru_sort_enabled_store() function incorrectly assumes that the allocation of damon_ctx will always succeed after it is attempted.

If the allocation of damon_ctx fails, the code still proceeds to call damon_commit_ctx() with a NULL ctx pointer, which leads to a NULL pointer dereference.

The fix involves checking if ctx is NULL and returning an error (-ENOMEM) to avoid dereferencing a NULL pointer.

Impact Analysis

This vulnerability can cause the Linux kernel to dereference a NULL pointer, which typically results in a kernel crash or system instability.

Such crashes can lead to denial of service conditions, potentially disrupting system availability.

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