CVE-2026-46115Critical· 9.8▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: block: add pgmap check to biovec_phys_mergeable biovec_phys_mergeable() is used by the request merge, DMA mapping, and integrity merge paths to decide if two physicall…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.5%
In the Linux kernel, the following vulnerability has been resolved:
block: add pgmap check to biovec_phys_mergeable
biovec_phys_mergeable() is used by the request merge, DMA mapping, and integrity merge paths to decide if two physically contiguous bvec segments can be coalesced into one. It currently has no check for whether the segments belong to different dev_pagemaps.
When zone device memory is registered in multiple chunks, each chunk gets its own dev_pagemap. A single bio can legitimately contain bvecs from different pgmaps -- iov_iter_extract_bvecs() breaks at pgmap boundaries but the outer loop in bio_iov_iter_get_pages() continues filling the same bio. If such bvecs are physically contiguous, biovec_phys_mergeable() will coalesce them, making it impossible to recover the correct pgmap for the merged segment via page_pgmap().
Add a zone_device_pages_have_same_pgmap() check to prevent merging bvec segments that span different pgmaps.
Linux >= 49580e690755d0e51ed7aa2c33225dd884fa738a < 3d2ecbd444b01d6500671d1a582b7393943cf539Linux >= 49580e690755d0e51ed7aa2c33225dd884fa738a < a7f3aa8c9df3905fe820ae36b67ba56b81587574Linux >= 49580e690755d0e51ed7aa2c33225dd884fa738a < f17d521075325b8afc42d1baa1c28a5e9aca111fLinux >= 49580e690755d0e51ed7aa2c33225dd884fa738a < f632dab4b841554cd6416058c61886d7db176581Linux >= 49580e690755d0e51ed7aa2c33225dd884fa738a < 13920e4b7b784b40cf4519ff1f0f3e513476a499Linux 6.2Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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