Bug 1794404 (CVE-2019-19965) - CVE-2019-19965 kernel: NULL pointer dereference in drivers/scsi/libsas/sas_discover.c because of mishandling of port disconnection during discovery
Summary: CVE-2019-19965 kernel: NULL pointer dereference in drivers/scsi/libsas/sas_di...
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2019-19965
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1890042 1890043 1890044 1890045 1890046 1794405 1812039 1812040 1812041 1812042 1812043
Blocks: 1794406
TreeView+ depends on / blocked
 
Reported: 2020-01-23 14:14 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-12-15 11:14 UTC (History)
41 users (show)

Fixed In Version:
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Doc Text:
A NULL pointer dereference flaw was found in the Linux kernel’s SCSI disk subsystem. A local user could use this flaw to crash the system, causing a denial of service.
Clone Of:
Environment:
Last Closed: 2021-12-15 11:14:08 UTC
Embargoed:

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Description Guilherme de Almeida Suckevicz 2020-01-23 14:14:40 UTC 
In the Linux kernel through 5.4.6, there is a NULL pointer dereference in drivers/scsi/libsas/sas_discover.c because of mishandling of port disconnection during discovery, related to a PHY down race condition.

Reference and upstream commit:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f70267f379b5e5e11bdc5d72a56bf17e5feed01f
Comment 1 Guilherme de Almeida Suckevicz 2020-01-23 14:15:28 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1794405]
Comment 2 Justin M. Forbes 2020-01-23 19:13:11 UTC 
This is fixed for Fedora with the 5.4.9 stable kernel update.
Comment 5 Alex 2020-03-10 17:22:47 UTC 
Mitigation:

To mitigate this issue, prevent module libsas from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.
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