{ "cveId": "CVE-2025-40199", "url": "https://patchblox.com/security/cve/CVE-2025-40199", "summary": "CVE-2025-40199 is fixed in 38 products on 1 platform, first by DEBIAN-CVE-2025-40199, released November 12, 2025. It is not reported as exploited. Patch Radar priority: High.", "title": "linux: In the Linux kernel, the following vulnerability has been resolved: page_pool: Fix PP_MAGIC_MASK to avoid crashing o...", "description": "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 \u003E0, 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\u0027s at least 8 bits available and that the PAGE_OFFSET bit calculation doesn\u0027t wrap", "published": "2025-11-12T22:15:47Z", "severity": "high", "cvss": 7.8, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "epss": 0.00151, "epssPercentile": 0.04276, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "fixes": [ { "platform": "linux", "product": "bpftool6.12", "release": "amzn 2023", "fixedVersion": "1:6.12.55-74.119.amzn2023", "fix": "ALAS2023-2025-1316", "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1316", "released": "2025-12-08T12:37:00Z" }, { "platform": "linux", "product": "bpftool6.12-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.12.55-74.119.amzn2023", "fix": "ALAS2023-2025-1316", "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1316", 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