Bug 2492735 (CVE-2026-53185) - CVE-2026-53185 kernel: zram: fix use-after-free in zram_bvec_write_partial()
Summary: CVE-2026-53185 kernel: zram: fix use-after-free in zram_bvec_write_partial()
Keywords:
Status: NEW
Alias: CVE-2026-53185
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: 2026-06-25 10:02 UTC by OSIDB Bzimport
Modified: 2026-10-27 21:30 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-2026:59723 0 None None None 2026-08-26 04:35:26 UTC
Red Hat Product Errata RHSA-2026:61887 0 None None None 2026-09-01 07:30:26 UTC
Red Hat Product Errata RHSA-2026:63013 0 None None None 2026-09-03 04:02:16 UTC
Red Hat Product Errata RHSA-2026:63014 0 None None None 2026-09-03 04:16:33 UTC
Red Hat Product Errata RHSA-2026:65708 0 None None None 2026-09-09 01:06:30 UTC
Red Hat Product Errata RHSA-2026:69089 0 None None None 2026-09-21 00:56:37 UTC
Red Hat Product Errata RHSA-2026:69837 0 None None None 2026-09-22 03:33:43 UTC
Red Hat Product Errata RHSA-2026:73645 0 None None None 2026-09-30 00:46:14 UTC
Red Hat Product Errata RHSA-2026:77214 0 None None None 2026-10-07 02:32:08 UTC
Red Hat Product Errata RHSA-2026:77215 0 None None None 2026-10-07 05:32:12 UTC

Description OSIDB Bzimport 2026-06-25 10:02:59 UTC 
In the Linux kernel, the following vulnerability has been resolved:

zram: fix use-after-free in zram_bvec_write_partial()

zram_read_page() picks the sync or async backing device read path based on
whether the parent bio is NULL.  zram_bvec_write_partial() passes its
parent bio down, so for ZRAM_WB slots the read is dispatched
asynchronously and zram_read_page() returns 0 while the bio is still in
flight.  The caller then runs memcpy_from_bvec(), zram_write_page() and
__free_page() on the buffer, leaving the async read to write into a freed
page.

zram_bvec_read_partial() was switched to NULL in commit 4e3c87b9421d
("zram: fix synchronous reads") for the same reason; the write_partial
counterpart was missed.
Comment 1 Keith Grant 2026-06-25 22:12:06 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062556-CVE-2026-53185-0922@gregkh/T
Comment 5 errata-xmlrpc 2026-08-26 04:35:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:59723 https://access.redhat.com/errata/RHSA-2026:59723
Comment 6 errata-xmlrpc 2026-09-01 07:30:23 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:61887 https://access.redhat.com/errata/RHSA-2026:61887
Comment 7 errata-xmlrpc 2026-09-03 04:02:15 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:63013 https://access.redhat.com/errata/RHSA-2026:63013
Comment 8 errata-xmlrpc 2026-09-03 04:16:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:63014 https://access.redhat.com/errata/RHSA-2026:63014
Comment 9 errata-xmlrpc 2026-09-09 01:06:29 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:65708 https://access.redhat.com/errata/RHSA-2026:65708
Comment 10 Jon Orris 2026-09-21 00:56:36 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:69089 https://access.redhat.com/errata/RHSA-2026:69089
Comment 11 Jon Orris 2026-09-22 03:33:43 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-2026:69837 https://access.redhat.com/errata/RHSA-2026:69837
Comment 13 Jon Orris 2026-09-30 00:46:13 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:73645 https://access.redhat.com/errata/RHSA-2026:73645
Comment 14 Jon Orris 2026-10-07 02:32:07 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:77214 https://access.redhat.com/errata/RHSA-2026:77214
Comment 15 Jon Orris 2026-10-07 05:32:11 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:77215 https://access.redhat.com/errata/RHSA-2026:77215
Note You need to log in before you can comment on or make changes to this bug.