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CVE-2026-46017mm: fix deferred split queue races during migration

Description

In the Linux kernel, the following vulnerability has been resolved: mm: fix deferred split queue races during migration migrate_folio_move() records the deferred split queue state from src and replays it on dst. Replaying it after remove_migration_ptes(src, dst, 0) makes dst visible before it is requeued, so a concurrent rmap-removal path can mark dst partially mapped and trip the WARN in deferred_split_folio(). Move the requeue before remove_migration_ptes() so dst is back on the deferred split queue before it becomes visible again. Because migration still holds dst locked at that point, teach deferred_split_scan() to requeue a folio when folio_trylock() fails. Otherwise a fully mapped underused folio can be dequeued by the shrinker and silently lost from split_queue. [[email protected]: move the comment]

Timeline

  1. ID reserved

    By Linux

  2. · 14 days later

    Published

  3. · 5 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-46017, by who scored it
Scored byCVSSScoreVector
NVDNVD · Analyzed3.1Medium4.7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.10% · top 99% of all CVEs (13 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.7.

Affected products

  • Linux · Linux

    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < cbf75cf212ee6e499abc1757fb4b5ae6d70ed0aa
    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 3bac01168982ec3e3bf87efdc1807c7933590a85
    • affected < 7.0.4

  • Linux · Linux

    • unaffected 7.0.4 – ≤ 7.0.*
    • unaffected 7.1 – ≤ *

References

References2

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .