Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: mm/util: don't read __page_2 for order-1 folios in snapshot_page() snapshot_page() currently reads __page_2 after checking nr_pages > 1, but it should only do so when nr_pages > 2. If an order-1 folio is allocated at the end of a vmemmap section, __page_2 will not exist and reading it will cause a fault. During DLPAR memory remove on a 22 TB ppc64le LPAR, snapshot_page() oopsed on the page isolation path while reading an order-1 folio's __page_2 from an adjacent absent section (unmapped vmemmap). Fix this to avoid reading memmap that doesn't exist (e.g., a vmemmap hole).
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 31a31da8a6187f1e5448ec73222e01d7d3fed4aa before 9668ffe0e2a5e2399dce281620198a2e415871fc; affected 31a31da8a6187f1e5448ec73222e01d7d3fed4aa before c649324571206a30949765320b91ccdb4c1722dc; affected 31a31da8a6187f1e5448ec73222e01d7d3fed4aa before 7441d6348c70738e9ed307510db171c7a9b3f4bf; affected 4117738bd42c8ab58090729daf0f8472a936f662; affected 6.12.111 before 6.13 |
| Linux / Linux | affected 6.15; unaffected 0 before 6.15; unaffected 6.18.44 through 6.18.*; unaffected 7.1.8 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.