Bug 2467059 (CVE-2026-43163) - CVE-2026-43163 kernel: md/bitmap: fix GPF in write_page caused by resize race
Summary: CVE-2026-43163 kernel: md/bitmap: fix GPF in write_page caused by resize race
Keywords:
Status: NEW
Alias: CVE-2026-43163
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-06 13:02 UTC by OSIDB Bzimport
Modified: 2026-07-13 07:59 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:19568 0 None None None 2026-05-20 12:57:44 UTC
Red Hat Product Errata RHSA-2026:21209 0 None None None 2026-05-27 01:42:42 UTC
Red Hat Product Errata RHSA-2026:21706 0 None None None 2026-05-28 08:26:06 UTC
Red Hat Product Errata RHSA-2026:21745 0 None None None 2026-05-28 13:26:33 UTC
Red Hat Product Errata RHSA-2026:22334 0 None None None 2026-06-01 22:10:18 UTC
Red Hat Product Errata RHSA-2026:22900 0 None None None 2026-06-03 15:19:28 UTC
Red Hat Product Errata RHSA-2026:22940 0 None None None 2026-06-03 19:17:56 UTC
Red Hat Product Errata RHSA-2026:23224 0 None None None 2026-06-04 12:16:34 UTC
Red Hat Product Errata RHSA-2026:25095 0 None None None 2026-06-10 17:36:28 UTC
Red Hat Product Errata RHSA-2026:26535 0 None None None 2026-06-17 09:18:48 UTC
Red Hat Product Errata RHSA-2026:26563 0 None None None 2026-06-17 11:58:36 UTC
Red Hat Product Errata RHSA-2026:38492 0 None None None 2026-07-13 07:59:21 UTC

Description OSIDB Bzimport 2026-05-06 13:02:06 UTC 
In the Linux kernel, the following vulnerability has been resolved:

md/bitmap: fix GPF in write_page caused by resize race

A General Protection Fault occurs in write_page() during array resize:
RIP: 0010:write_page+0x22b/0x3c0 [md_mod]

This is a use-after-free race between bitmap_daemon_work() and
__bitmap_resize(). The daemon iterates over `bitmap->storage.filemap`
without locking, while the resize path frees that storage via
md_bitmap_file_unmap(). `quiesce()` does not stop the md thread,
allowing concurrent access to freed pages.

Fix by holding `mddev->bitmap_info.mutex` during the bitmap update.
Comment 1 Keith Grant 2026-05-06 19:27:36 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050632-CVE-2026-43163-86e1@gregkh/T
Comment 5 errata-xmlrpc 2026-05-20 12:57:43 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:19568 https://access.redhat.com/errata/RHSA-2026:19568
Comment 6 errata-xmlrpc 2026-05-27 01:42:41 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:21209 https://access.redhat.com/errata/RHSA-2026:21209
Comment 7 errata-xmlrpc 2026-05-28 08:26:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:21706 https://access.redhat.com/errata/RHSA-2026:21706
Comment 8 errata-xmlrpc 2026-05-28 13:26:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:21745 https://access.redhat.com/errata/RHSA-2026:21745
Comment 9 errata-xmlrpc 2026-06-01 22:10:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:22334 https://access.redhat.com/errata/RHSA-2026:22334
Comment 11 errata-xmlrpc 2026-06-03 15:19:27 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:22900 https://access.redhat.com/errata/RHSA-2026:22900
Comment 12 errata-xmlrpc 2026-06-03 19:17:55 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:22940 https://access.redhat.com/errata/RHSA-2026:22940
Comment 13 errata-xmlrpc 2026-06-04 12:16:33 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:23224 https://access.redhat.com/errata/RHSA-2026:23224
Comment 14 errata-xmlrpc 2026-06-10 17:36:27 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:25095 https://access.redhat.com/errata/RHSA-2026:25095
Comment 15 errata-xmlrpc 2026-06-17 09:18:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:26535 https://access.redhat.com/errata/RHSA-2026:26535
Comment 16 errata-xmlrpc 2026-06-17 11:58:35 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:26563 https://access.redhat.com/errata/RHSA-2026:26563
Comment 18 errata-xmlrpc 2026-07-13 07:59:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:38492 https://access.redhat.com/errata/RHSA-2026:38492
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