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CVE-2025-22015— mm/migrate: fix shmem xarray update during migration

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于迁移过程中xarray更新错误，可能导致内存映射数据损坏。

CVSS 7.8 · High EPSS 0.21% · P11

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux be72d197b2281e2ee3f28017fc9be1ab17e26d16< 49100c0b070e900f87c8fac3be9b9ef8a30fa673 affected
07550b1461d4d0499165e7d6f7718cfd0e440427< 29124ae980e2860f0eec7355949d3d3292ee81da affected
fc346d0a70a13d52fe1c4bc49516d83a42cd7c4c< c057ee03f751d6cecf7ee64f52f6545d94082aaa affected
fc346d0a70a13d52fe1c4bc49516d83a42cd7c4c< 75cfb92eb63298d717b6b0118f91ba12c4fcfeb5 affected
fc346d0a70a13d52fe1c4bc49516d83a42cd7c4c< 60cf233b585cdf1f3c5e52d1225606b86acd08b0 affected
6.1.71< 6.1.132 affected
6.6.10< 6.6.85 affected
6.7 affected
… +6 more rows
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I. Basic Information for CVE-2025-22015

Vulnerability Information
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Vulnerability Title
mm/migrate: fix shmem xarray update during migration
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于迁移过程中xarray更新错误，可能导致内存映射数据损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux be72d197b2281e2ee3f28017fc9be1ab17e26d16 ~ 49100c0b070e900f87c8fac3be9b9ef8a30fa673 -
Linux Linux 6.7 -

II. Public POCs for CVE-2025-22015

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III. Intelligence Information for CVE-2025-22015

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Patches & Fixes for CVE-2025-22015 (2)

Same Patch Batch · Linux · 2025-04-08 · 10 CVEs total

CVE-2025-22012 8.8 HIGH Revert "arm64: dts: qcom: sdm845: Affirm IDR0.CCTW on apps_smmu"
CVE-2025-22013 7.3 HIGH KVM: arm64: Unconditionally save+flush host FPSIMD/SVE/SME state
CVE-2025-22017 devlink: fix xa_alloc_cyclic() error handling
CVE-2025-22016 dpll: fix xa_alloc_cyclic() error handling
CVE-2025-22014 soc: qcom: pdr: Fix the potential deadlock
CVE-2025-22011 ARM: dts: bcm2711: Fix xHCI power-domain
CVE-2025-22010 RDMA/hns: Fix soft lockup during bt pages loop
CVE-2025-22009 regulator: dummy: force synchronous probing
CVE-2025-22008 regulator: check that dummy regulator has been probed before using it

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-22015

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