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Fencer Vulns
medium 4.7

CVE-2019-19965 json

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…

published 2019-12-25 6 y ago modified 2026-10-08 31 d ago also EUVD-2019-9553

cvss
4.7
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 51%
public exploits
0
none known

Summary

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, aka CID-f70267f379b5.

Patch / fix

  • linux Debian 14, Debian 13, Debian 12 5.4.13-1

debian advisories DEBIAN-CVE-2019-19965

  • linux Ubuntu 16.04 LTS 4.4.0-174.204
  • linux Ubuntu 18.04 LTS 4.15.0-88.88
  • linux-aws Ubuntu 16.04 LTS 4.4.0-1102.113
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1060.62
  • linux-gcp Ubuntu 16.04 LTS 4.15.0-1055.59
  • linux-gcp Ubuntu 18.04 LTS 5.0.0-1031.32
  • linux-hwe Ubuntu 16.04 LTS 4.15.0-88.88~16.04.1
  • linux-hwe Ubuntu 18.04 LTS 5.3.0-40.32~18.04.1

ubuntu advisories UBUNTU-CVE-2019-19965

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel-syms SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.52.1
  • kernel-source SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.52.1
  • kernel-default SLES for SAP 15, SLES 15-LTSS, SLE Live Patching 15 +3 more 4.12.14-150.52.1
  • kernel-vanilla SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.52.1
  • kernel-obs-build SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.52.1
  • kernel-syms SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +1 more 4.4.121-92.129.1
  • kernel-source SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +1 more 4.4.121-92.129.1
  • kernel-default SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +2 more 4.4.121-92.129.1

suse advisories SUSE-SU-2020:1663-1SUSE-SU-2020:1255-1SUSE-SU-2020:1275-1SUSE-SU-2020:14354-1SUSE-SU-2020:0613-1SUSE-SU-2020:0605-1

  • kernel-syms openSUSE Leap 15.1 4.12.14-lp151.28.40.1
  • kernel-obs-qa openSUSE Leap 15.1 4.12.14-lp151.28.40.1
  • kernel-source openSUSE Leap 15.1 4.12.14-lp151.28.40.1
  • kernel-default openSUSE Leap 15.1 4.12.14-lp151.28.40.1
  • kernel-vanilla openSUSE Leap 15.1 4.12.14-lp151.28.40.1
  • kernel-kvmsmall openSUSE Leap 15.1 4.12.14-lp151.28.40.1
  • kernel-obs-build openSUSE Leap 15.1 4.12.14-lp151.28.40.1

opensuse advisories openSUSE-SU-2020:0336-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-19965 updated cvss 4.7

kernel: NULL pointer dereference in drivers/scsi/libsas/sas_discover.c because of mishandling of port disconnection during discovery

  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    affected: workaround, no fix planned “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.”
  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, kernel-alt, python-perf, +9 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
    affected: workaround, no fix available “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.”
  • Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    affected: workaround, no fix planned “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.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
31 d ago

Exploit prediction

0.65% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • git.kernel.org https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f70267f379b5e5e11bdc5d72a56bf17e5feed01f referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 1.9 AV:L/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.