CVE-2025-22015mm/migrate: fix shmem xarray update during migration
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from be72d197b2281e2ee3f28017fc9be1ab17e26d16 before 49100c0b070e900f87c8fac3be9b9ef8a30fa673; from 07550b1461d4d0499165e7d6f7718cfd0e440427 before 29124ae980e2860f0eec7355949d3d3292ee81da; from fc346d0a70a13d52fe1c4bc49516d83a42cd7c4c before c057ee03f751d6cecf7ee64f52f6545d94082aaa; from fc346d0a70a13d52fe1c4bc49516d83a42cd7c4c before 75cfb92eb63298d717b6b0118f91ba12c4fcfeb5; from fc346d0a70a13d52fe1c4bc49516d83a42cd7c4c before 60cf233b585cdf1f3c5e52d1225606b86acd08b0; from 6.1.71 before 6.1.132; from 6.6.10 before 6.6.85 | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 6.1.71 before 6.1.132; from 6.6.10 before 6.6.85; from 6.7.1 before 6.12.21; from 6.13 before 6.13.9; 6.7; 6.7; 6.14; 6.14; and 5 more ranges | NVD |
References
- https://git.kernel.org/stable/c/49100c0b070e900f87c8fac3be9b9ef8a30fa673patch
- https://git.kernel.org/stable/c/29124ae980e2860f0eec7355949d3d3292ee81dapatch
- https://git.kernel.org/stable/c/c057ee03f751d6cecf7ee64f52f6545d94082aaapatch
- https://git.kernel.org/stable/c/75cfb92eb63298d717b6b0118f91ba12c4fcfeb5patch
- https://git.kernel.org/stable/c/60cf233b585cdf1f3c5e52d1225606b86acd08b0patch
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.