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Linux Kernel CVE-2026-23097

MEDIUM
2026-02-04 416baaa9-dc9f-4396-8d5f-8c081fb06d67
5.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SUSE
MEDIUM
qualitative
Red Hat
7.3 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Patch released
Apr 09, 2026 - 20:30 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Feb 04, 2026 - 17:16 nvd
MEDIUM 5.5

DescriptionCVE.org

In the Linux kernel, the following vulnerability has been resolved:

migrate: correct lock ordering for hugetlb file folios

Syzbot has found a deadlock (analyzed by Lance Yang):

  1. Task (5749): Holds folio_lock, then tries to acquire i_mmap_rwsem(read lock).
  2. Task (5754): Holds i_mmap_rwsem(write lock), then tries to acquire

folio_lock.

migrate_pages() -> migrate_hugetlbs() -> unmap_and_move_huge_page() <- Takes folio_lock! -> remove_migration_ptes() -> __rmap_walk_file() -> i_mmap_lock_read() <- Waits for i_mmap_rwsem(read lock)!

hugetlbfs_fallocate() -> hugetlbfs_punch_hole() <- Takes i_mmap_rwsem(write lock)! -> hugetlbfs_zero_partial_page() -> filemap_lock_hugetlb_folio() -> filemap_lock_folio() -> __filemap_get_folio <- Waits for folio_lock!

The migration path is the one taking locks in the wrong order according to the documentation at the top of mm/rmap.c. So expand the scope of the existing i_mmap_lock to cover the calls to remove_migration_ptes() too.

This is (mostly) how it used to be after commit c0d0381ade79. That was removed by 336bf30eb765 for both file & anon hugetlb pages when it should only have been removed for anon hugetlb pages.

AnalysisAI

A deadlock vulnerability in the Linux kernel's hugetlb file folio migration code allows a local privileged user to cause a denial of service by triggering conflicting lock acquisitions between folio locks and memory mapping semaphores. The vulnerability occurs when migrate_pages() and hugetlbfs_fallocate() operations compete for locks in opposite orders, freezing affected processes. No patch is currently available for this medium-severity issue.

Technical ContextAI

In the Linux kernel, the following vulnerability has been resolved:

migrate: correct lock ordering for hugetlb file folios

Syzbot has found a deadlock (analyzed by Lance Yang):

  1. Task (5749): Holds folio_lock, then tries to acquire i_mmap_rwsem(read lock).
  2. Task (5754): Holds i_mmap_rwsem(write lock), then tries to acquire

folio_lock.

migrate_pages() -> migrate_hugetlbs() -> unmap_and_move_huge_page() <- Takes folio_lock! -> remove_migration_ptes() -> __rmap_walk_f

RemediationAI

Monitor vendor advisories for a patch.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
Container suse/sl-micro/6.1/baremetal-os-container:2.2.1-7.67 Container suse/sl-micro/6.1/base-os-container:2.2.1-5.89 Container suse/sl-micro/6.1/kvm-os-container:2.2.1-5.92 Container suse/sl-micro/6.1/rt-os-container:2.2.1-5.81 Affected
Image SL-Micro-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-Azure-ltd Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-EC2-llc Image SUSE-Multi-Linux-Manager-Server-EC2-ltd Affected
SUSE Liberty Linux 8 Fixed
SUSE Linux Enterprise High Availability Extension 16.0 Fixed
SUSE Linux Enterprise Server 16.0 Fixed

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CVE-2026-23097 vulnerability details – vuln.today

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