Bug 1831849 (CVE-2020-12652) - CVE-2020-12652 kernel: race condition in __mptctl_ioctl function in drivers/message/fusion/mptctl.c allows local users to hold an incorrect lock during the ioctl operation
Summary: CVE-2020-12652 kernel: race condition in __mptctl_ioctl function in drivers/m...
Keywords:
Status: NEW
Alias: CVE-2020-12652
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Nobody
QA Contact:
URL:
Whiteboard:
Depends On: 1831853 1838204 1838205
Blocks: 1831851
TreeView+ depends on / blocked
 
Reported: 2020-05-05 18:41 UTC by Guilherme de Almeida Suckevicz
Modified: 2024-01-19 19:11 UTC (History)
39 users (show)

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Doc Type: If docs needed, set a value
Doc Text:
A vulnerability was found in __mptctl_ioctl in drivers/message/fusion/mptctl.c in Fusion MPT base driver 'mptctl' in the SCSI device module, where an incorrect lock leads to a race problem. This flaw allows an attacker with local access and special user (or root) privileges to cause a denial of service.
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Description Guilherme de Almeida Suckevicz 2020-05-05 18:41:11 UTC 
A vulnerability was found in __mptctl_ioctl in drivers/message/fusion/mptctl.c in Fusion MPT base driver 'mptctl'  in SCSI device module. In this problem holding an incorrect lock can lead to a race problem, where an attacker with a local access and a special user (or root) privilege can cause denial of service (DoS) problem.

The __mptctl_ioctl function allows local users to hold an incorrect lock during the ioctl operation and trigger a race condition, i.e., a "double fetch" vulnerability. 

Reference and upstream commit:
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.14
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=28d76df18f0ad5bcf5fa48510b225f0ed262a99b
Comment 1 Guilherme de Almeida Suckevicz 2020-05-05 18:44:28 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1831853]
Comment 2 Justin M. Forbes 2020-05-05 19:25:43 UTC 
This was fixed for Fedora with the 5.4.14 stable kernel update.
Comment 8 RaTasha Tillery-Smith 2020-05-28 17:31:28 UTC 
Mitigation:

Mitigation for this issue is to skip loading the affected module Fusion MPT base driver 'mptctl' onto the system until we have a fix available. This can be done by a blacklist mechanism and will ensure the driver is not loaded at the boot time.
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How do I blacklist a kernel module to prevent it from loading automatically?
https://access.redhat.com/solutions/41278 
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