CVE-2026-46115 (GCVE-0-2026-46115)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:35 – Updated: 2026-06-14 17:55
VLAI
Title
block: add pgmap check to biovec_phys_mergeable
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 49580e690755d0e51ed7aa2c33225dd884fa738a , < 3d2ecbd444b01d6500671d1a582b7393943cf539 (git)
Affected: 49580e690755d0e51ed7aa2c33225dd884fa738a , < a7f3aa8c9df3905fe820ae36b67ba56b81587574 (git)
Affected: 49580e690755d0e51ed7aa2c33225dd884fa738a , < f17d521075325b8afc42d1baa1c28a5e9aca111f (git)
Affected: 49580e690755d0e51ed7aa2c33225dd884fa738a , < f632dab4b841554cd6416058c61886d7db176581 (git)
Affected: 49580e690755d0e51ed7aa2c33225dd884fa738a , < 13920e4b7b784b40cf4519ff1f0f3e513476a499 (git)
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Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 6.18.30 , ≤ 6.18.* (semver)
Unaffected: 7.0.7 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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    "redhat_vex": {
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      "cve": "CVE-2026-46115",
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      "cve": "CVE-2026-46115",
      "id": "CVE-2026-46115",
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      "title": "SUSE CVE CVE-2026-46115",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46115.json",
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.