CVE-2025-22015 (GCVE-0-2025-22015)

Vulnerability from cvelistv5 – Published: 2025-04-08 08:18 – Updated: 2025-11-03 19:41
VLAI?
Title
mm/migrate: fix shmem xarray update during migration
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/migrate: fix shmem xarray update during migration A shmem folio can be either in page cache or in swap cache, but not at the same time. Namely, once it is in swap cache, folio->mapping should be NULL, and the folio is no longer in a shmem mapping. In __folio_migrate_mapping(), to determine the number of xarray entries to update, folio_test_swapbacked() is used, but that conflates shmem in page cache case and shmem in swap cache case. It leads to xarray multi-index entry corruption, since it turns a sibling entry to a normal entry during xas_store() (see [1] for a userspace reproduction). Fix it by only using folio_test_swapcache() to determine whether xarray is storing swap cache entries or not to choose the right number of xarray entries to update. [1] https://lore.kernel.org/linux-mm/Z8idPCkaJW1IChjT@casper.infradead.org/ Note: In __split_huge_page(), folio_test_anon() && folio_test_swapcache() is used to get swap_cache address space, but that ignores the shmem folio in swap cache case. It could lead to NULL pointer dereferencing when a in-swap-cache shmem folio is split at __xa_store(), since !folio_test_anon() is true and folio->mapping is NULL. But fortunately, its caller split_huge_page_to_list_to_order() bails out early with EBUSY when folio->mapping is NULL. So no need to take care of it here.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: be72d197b2281e2ee3f28017fc9be1ab17e26d16 , < 49100c0b070e900f87c8fac3be9b9ef8a30fa673 (git)
Affected: 07550b1461d4d0499165e7d6f7718cfd0e440427 , < 29124ae980e2860f0eec7355949d3d3292ee81da (git)
Affected: fc346d0a70a13d52fe1c4bc49516d83a42cd7c4c , < c057ee03f751d6cecf7ee64f52f6545d94082aaa (git)
Affected: fc346d0a70a13d52fe1c4bc49516d83a42cd7c4c , < 75cfb92eb63298d717b6b0118f91ba12c4fcfeb5 (git)
Affected: fc346d0a70a13d52fe1c4bc49516d83a42cd7c4c , < 60cf233b585cdf1f3c5e52d1225606b86acd08b0 (git)
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    Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 6.1.132 , ≤ 6.1.* (semver)
Unaffected: 6.6.85 , ≤ 6.6.* (semver)
Unaffected: 6.12.21 , ≤ 6.12.* (semver)
Unaffected: 6.13.9 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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