Bug 1892176 (CVE-2020-25669) - CVE-2020-25669 kernel: use-after-free read in sunkbd_reinit in drivers/input/keyboard/sunkbd.c
Summary: CVE-2020-25669 kernel: use-after-free read in sunkbd_reinit in drivers/input/...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2020-25669
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
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Depends On:
Blocks: Embargoed1891760 Red Hat1939822
TreeView+ depends on / blocked
 
Reported: 2020-10-28 05:45 UTC by Wade Mealing
Modified: 2021-05-26 13:05 UTC (History)
16 users (show)

Fixed In Version: kernel 5.10-rc5
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Last Closed: 2020-11-24 11:33:54 UTC

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Description Wade Mealing 2020-10-28 05:45:55 UTC 
The function sunkbd_reinit having been scheduled by sunkbd_interrupt before sunkbd being freed.
Though the dangling pointer is set to NULL in sunkbd_disconnect, there is still a alias in sunkbd_reinit so that causing Use After Free.
Comment 1 Wade Mealing 2020-10-28 05:49:13 UTC 
At this time, Red Hat (And Fedora) do not ship with this kernel build option enabled at this time.
Comment 2 msiddiqu 2020-11-24 10:49:16 UTC 
References: 
 
https://www.openwall.com/lists/oss-security/2020/11/05/2
Comment 3 Product Security DevOps Team 2020-11-24 11:33:54 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-25669
Comment 4 Michael Kaplan 2021-05-26 13:05:19 UTC 
Upstream patch https://github.com/torvalds/linux/commit/77e70d351db7de07a46ac49b87a6c3c7a60fca7e
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