CVE-2026-46115block: add pgmap check to biovec_phys_mergeable
Updated under an hour ago ()
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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: 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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/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
- Undergoing Analysis
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 49580e690755d0e51ed7aa2c33225dd884fa738a builds before 3d2ecbd444b01d6500671d1a582b7393943cf539; from 49580e690755d0e51ed7aa2c33225dd884fa738a before a7f3aa8c9df3905fe820ae36b67ba56b81587574; from 49580e690755d0e51ed7aa2c33225dd884fa738a before f17d521075325b8afc42d1baa1c28a5e9aca111f; from 49580e690755d0e51ed7aa2c33225dd884fa738a before f632dab4b841554cd6416058c61886d7db176581; 49580e690755d0e51ed7aa2c33225dd884fa738a builds before 13920e4b7b784b40cf4519ff1f0f3e513476a499 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.2 before 6.6.140; from 6.7 before 6.12.88; from 6.13 before 6.18.30; from 6.19 before 7.0.7 | NVD |
References
- https://git.kernel.org/stable/c/3d2ecbd444b01d6500671d1a582b7393943cf539patch
- https://git.kernel.org/stable/c/a7f3aa8c9df3905fe820ae36b67ba56b81587574patch
- https://git.kernel.org/stable/c/f17d521075325b8afc42d1baa1c28a5e9aca111fpatch
- https://git.kernel.org/stable/c/f632dab4b841554cd6416058c61886d7db176581patch
- https://git.kernel.org/stable/c/13920e4b7b784b40cf4519ff1f0f3e513476a499patch
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.