Katalog CVE

CVE-2025-40199

WysokieCVSS 7.8
Opublikowano: Zaktualizowano: Przetłumaczono: NVD NIST

Prawdopodobieństwo exploitacji (EPSS)

Niskie ryzyko
0.14%

Percentyl 4 - wyżej niż 4% wszystkich znanych CVE

Streszczenie

W jądrze Linux w page_pool maska PP_MAGIC_MASK jest zbyt szeroka na niektórych 32-bitowych architekturach, co powoduje fałszywie pozytywne wyniki w page_pool_page_is_pp() i crash systemu.

Ocena ryzyka

Podatność może spowodować awarię systemu (kernel panic) na 32-bitowych architekturach (np. parisc), co prowadzi do odmowy usługi (DoS).

Rekomendacja

Zastosuj łatkę z jądra Linux dla page_pool. Zaktualizuj jądro do wersji zawierającej fix dla CVE-2025-40199.

Inne podatności w Linux kernel

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Oryginalny opis (angielski, źródło NVD)

In the Linux kernel, the following vulnerability has been resolved: page_pool: Fix PP_MAGIC_MASK to avoid crashing on some 32-bit arches Helge reported that the introduction of PP_MAGIC_MASK let to crashes on boot on his 32-bit parisc machine. The cause of this is the mask is set too wide, so the page_pool_page_is_pp() incurs false positives which crashes the machine. Just disabling the check in page_pool_is_pp() will lead to the page_pool code itself malfunctioning; so instead of doing this, this patch changes the define for PP_DMA_INDEX_BITS to avoid mistaking arbitrary kernel pointers for page_pool-tagged pages. The fix relies on the kernel pointers that alias with the pp_magic field always being above PAGE_OFFSET. With this assumption, we can use the lowest bit of the value of PAGE_OFFSET as the upper bound of the PP_DMA_INDEX_MASK, which should avoid the false positives. Because we cannot rely on PAGE_OFFSET always being a compile-time constant, nor on it always being >0, we fall back to disabling the dma_index storage when there are not enough bits available. This leaves us in the situation we were in before the patch in the Fixes tag, but only on a subset of architecture configurations. This seems to be the best we can do until the transition to page types in complete for page_pool pages. v2: - Make sure there's at least 8 bits available and that the PAGE_OFFSET bit calculation doesn't wrap

Dane podatności pochodzą z NVD (NIST) · CISA KEV · EPSS