CVE-2024-35797 Vulnerability Details

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CVE-2024-35797 Metadata Quick Info

CVE Published: 17/05/2024 | CVE Updated: 12/11/2024 | CVE Year: 2024
Source: Linux | Vendor: Linux | Product: Linux
Status : PUBLISHED

CVE-2024-35797 Description

In the Linux kernel, the following vulnerability has been resolved: mm: cachestat: fix two shmem bugs When cachestat on shmem races with swapping and invalidation, there are two possible bugs: 1) A swapin error can have resulted in a poisoned swap entry in the shmem inode\'s xarray. Calling get_shadow_from_swap_cache() on it will result in an out-of-bounds access to swapper_spaces[]. Validate the entry with non_swap_entry() before going further. 2) When we find a valid swap entry in the shmem\'s inode, the shadow entry in the swapcache might not exist yet: swap IO is still in progress and we\'re before __remove_mapping; swapin, invalidation, or swapoff have removed the shadow from swapcache after we saw the shmem swap entry. This will send a NULL to workingset_test_recent(). The latter purely operates on pointer bits, so it won\'t crash - node 0, memcg ID 0, eviction timestamp 0, etc. are all valid inputs - but it\'s a bogus test. In theory that could result in a false "recently evicted" count. Such a false positive wouldn\'t be the end of the world. But for code clarity and (future) robustness, be explicit about this case. Bail on get_shadow_from_swap_cache() returning NULL.

Metrics

CVSS Version: 3.1 | Base Score: n/a
Vector: n/a

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Weakness Enumeration (CWE)

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Source: Linux

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Source: NVD (National Vulnerability Database).