RHSA-2026:3463

Vulnerability from csaf_redhat - Published: 2026-03-02 00:18 - Updated: 2026-03-02 07:27
Summary
Red Hat Security Advisory: kernel-rt security update

Notes

Topic
An update for kernel-rt is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix(es): * kernel: Linux kernel: Denial of Service due to a deadlock in hugetlb folio migration (CVE-2026-23097) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nmigrate: correct lock ordering for hugetlb file folios\n\nSyzbot has found a deadlock (analyzed by Lance Yang):\n\n1) Task (5749): Holds folio_lock, then tries to acquire i_mmap_rwsem(read lock).\n2) Task (5754): Holds i_mmap_rwsem(write lock), then tries to acquire\nfolio_lock.\n\nmigrate_pages()\n  -\u003e migrate_hugetlbs()\n    -\u003e unmap_and_move_huge_page()     \u003c- Takes folio_lock!\n      -\u003e remove_migration_ptes()\n        -\u003e __rmap_walk_file()\n          -\u003e i_mmap_lock_read()       \u003c- Waits for i_mmap_rwsem(read lock)!\n\nhugetlbfs_fallocate()\n  -\u003e hugetlbfs_punch_hole()           \u003c- Takes i_mmap_rwsem(write lock)!\n    -\u003e hugetlbfs_zero_partial_page()\n     -\u003e filemap_lock_hugetlb_folio()\n      -\u003e filemap_lock_folio()\n        -\u003e __filemap_get_folio        \u003c- Waits for folio_lock!\n\nThe migration path is the one taking locks in the wrong order according to\nthe documentation at the top of mm/rmap.c.  So expand the scope of the\nexisting i_mmap_lock to cover the calls to remove_migration_ptes() too.\n\nThis is (mostly) how it used to be after commit c0d0381ade79.  That was\nremoved by 336bf30eb765 for both file \u0026 anon hugetlb pages when it should\nonly have been removed for anon hugetlb pages.",
          "title": "Vulnerability description"
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          "text": "kernel: Linux kernel: Denial of Service due to a deadlock in hugetlb folio migration",
          "title": "Vulnerability summary"
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        {
          "category": "other",
          "text": "A deadlock can occur when migrating hugetlb file backed folios due to incorrect lock ordering between folio_lock and the mapping i_mmap_rwsem. One task in the migration path can hold folio_lock and then block on i_mmap_lock_read. Another task such as hugetlbfs fallocate or punch hole can hold i_mmap_lock_write and then block on folio_lock. This ABBA pattern can hang tasks indefinitely and lead to a denial of service. For the CVSS the PR is N because the involved operations can be triggered by normal users who can access hugetlbfs and run memory pressure and file operations. The issue is not network reachable. Impact is denial of service due to hung tasks and potential system wide stalls.",
          "title": "Statement"
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          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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      "title": "kernel: Linux kernel: Denial of Service due to a deadlock in hugetlb folio migration"
    }
  ]
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.