CVE-2024-35797 (GCVE-0-2024-35797)

Vulnerability from cvelistv5 – Published: 2024-05-17 13:23 – Updated: 2025-05-04 09:05
VLAI?
Title
mm: cachestat: fix two shmem bugs
Summary
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.
Severity ?
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: cf264e1329fb0307e044f7675849f9f38b44c11a , < b79f9e1ff27c994a4c452235ba09e672ec698e23 (git)
Affected: cf264e1329fb0307e044f7675849f9f38b44c11a , < d962f6c583458037dc7e529659b2b02b9dd3d94b (git)
Affected: cf264e1329fb0307e044f7675849f9f38b44c11a , < 24a0e73d544439bb9329fbbafac44299e548a677 (git)
Affected: cf264e1329fb0307e044f7675849f9f38b44c11a , < d5d39c707a4cf0bcc84680178677b97aa2cb2627 (git)
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    Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 6.6.24 , ≤ 6.6.* (semver)
Unaffected: 6.7.12 , ≤ 6.7.* (semver)
Unaffected: 6.8.3 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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