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NVD / CVE Program· CNA mitre

CVE-2019-20054: In the Linux kernel before 5.0.6, there is a NULL pointer dereference in drop_sysctl_table() in fs/proc/proc_sysctl.c, related to put_links,

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.47% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: linux (Debian:12) 5.2.6-1; kernel (Red Hat:enterprise_linux:7::server) 0:4.14.0-115.19.1.el7a; kernel-abi-whitelists (Red Hat:enterprise_linux:7::server) 0:4.14.0-115.19.1.el7a.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to linux (Debian:12) 5.2.6-1; kernel (Red Hat:enterprise_linux:7::server) 0:4.14.0-115.19.1.el7a; kernel-abi-whitelists (Red Hat:enterprise_linux:7::server) 0:4.14.0-115.19.1.el7a or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel before 5.0.6, there is a NULL pointer dereference in drop_sysctl_table() in fs/proc/proc_sysctl.c, related to put_links, aka CID-23da9588037e.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Dec 28, 2019
Updated
Jun 16, 2026
EPSS
0.4% · 40th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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  • when exploit code appears or is weaponized
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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
netappactive iq unified manager
netappcloud backup
netappdata availability services
netappe-series santricity os controller
netappfas\/aff baseboard management controller
netappsolidfire \& hci management node
netappsteelstore cloud integrated storage
netappsolidfire baseboard management controller
netapph610s firmware
netapph610s
netapp8300 firmware

and 5 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernelbefore 5.0.6
  • netapp 8300 firmwareall versions
  • netapp 8700 firmwareall versions
  • netapp a400 firmwareall versions
  • netapp active iq unified managerall versions
  • netapp cloud backupall versions
  • netapp data availability servicesall versions
  • netapp e-series santricity os controller11.0 and later · up to 11.70.2 inclusive
  • netapp fas/aff baseboard management controllerall versions
  • netapp h610s firmwareall versions
  • netapp solidfire & hci management nodeall versions
  • netapp solidfire baseboard management controllerall versions
  • netapp steelstore cloud integrated storageall versions

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.2.6-15.2.6-1
Red Hat:enterprise_linux:7::serverkernelbefore 0:4.14.0-115.19.1.el7a0:4.14.0-115.19.1.el7a
Red Hat:enterprise_linux:7::serverkernel-abi-whitelistsbefore 0:4.14.0-115.19.1.el7a0:4.14.0-115.19.1.el7a
Red Hat:enterprise_linux:7::serverkernel-altbefore 0:4.14.0-115.19.1.el7a0:4.14.0-115.19.1.el7a
Red Hat:enterprise_linux:7::serverkernel-bootwrapperbefore 0:4.14.0-115.19.1.el7a0:4.14.0-115.19.1.el7a
Red Hat:enterprise_linux:7::serverkernel-debugbefore 0:4.14.0-115.19.1.el7a0:4.14.0-115.19.1.el7a
Red Hat:enterprise_linux:7::serverkernel-debug-debuginfobefore 0:4.14.0-115.19.1.el7a0:4.14.0-115.19.1.el7a
Red Hat:enterprise_linux:7::serverkernel-debug-develbefore 0:4.14.0-115.19.1.el7a0:4.14.0-115.19.1.el7a
Red Hat:enterprise_linux:7::serverkernel-debuginfobefore 0:4.14.0-115.19.1.el7a0:4.14.0-115.19.1.el7a
Red Hat:enterprise_linux:7::serverkernel-debuginfo-common-ppc64lebefore 0:4.14.0-115.19.1.el7a0:4.14.0-115.19.1.el7a
Red Hat:enterprise_linux:7::serverkernel-develbefore 0:4.14.0-115.19.1.el7a0:4.14.0-115.19.1.el7a
Red Hat:enterprise_linux:7::serverkernel-docbefore 0:4.14.0-115.19.1.el7a0:4.14.0-115.19.1.el7a
Red Hat:enterprise_linux:7::serverkernel-toolsbefore 0:4.14.0-115.19.1.el7a0:4.14.0-115.19.1.el7a
Red Hat:enterprise_linux:7::serverkernel-tools-debuginfobefore 0:4.14.0-115.19.1.el7a0:4.14.0-115.19.1.el7a
Red Hat:enterprise_linux:7::serverkernel-tools-libsbefore 0:4.14.0-115.19.1.el7a0:4.14.0-115.19.1.el7a
Red Hat:enterprise_linux:7::serverkernel-tools-libs-develbefore 0:4.14.0-115.19.1.el7a0:4.14.0-115.19.1.el7a
Red Hat:enterprise_linux:7::serverperfbefore 0:4.14.0-115.19.1.el7a0:4.14.0-115.19.1.el7a
Red Hat:enterprise_linux:7::serverperf-debuginfobefore 0:4.14.0-115.19.1.el7a0:4.14.0-115.19.1.el7a
Red Hat:enterprise_linux:7::serverpython-perfbefore 0:4.14.0-115.19.1.el7a0:4.14.0-115.19.1.el7a
Red Hat:enterprise_linux:7::serverpython-perf-debuginfobefore 0:4.14.0-115.19.1.el7a0:4.14.0-115.19.1.el7a
SUSE:HPE Helion OpenStack 8kernel-defaultbefore 4.4.180-94.116.14.4.180-94.116.1
SUSE:HPE Helion OpenStack 8kernel-sourcebefore 4.4.180-94.116.14.4.180-94.116.1
SUSE:HPE Helion OpenStack 8kernel-symsbefore 4.4.180-94.116.14.4.180-94.116.1
SUSE:HPE Helion OpenStack 8kgraft-patch-SLE12-SP3_Update_31before 1-4.3.11-4.3.1

+17

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2019-19965Dec 25, 2019 · 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
    18Monitor
  • ← EarlierCVE-2011-1474Dec 26, 2019 · A locally locally exploitable DOS vulnerability was found in pax-linux versions 2.6.32.33-test79.patch, 2.6.38-test3.patch, and 2.6.37.4-tes
    22Monitor
  • Later →CVE-2019-20096Dec 30, 2019 · In the Linux kernel before 5.1, there is a memory leak in __feat_register_sp() in net/dccp/feat.c, which may cause denial of service, aka CI
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:linux5.2.6-1 · Debian:12Package registry (OSV)
red hat:kernel0:4.14.0-115.19.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-abi-whitelists0:4.14.0-115.19.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-alt0:4.14.0-115.19.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-bootwrapper0:4.14.0-115.19.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-debug0:4.14.0-115.19.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.14.0-115.19.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-debuginfo0:4.14.0-115.19.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-debuginfo-common-ppc64le0:4.14.0-115.19.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-devel0:4.14.0-115.19.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-doc0:4.14.0-115.19.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-tools0:4.14.0-115.19.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-tools-debuginfo0:4.14.0-115.19.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
suse:kernel-azure4.12.14-6.37.1 · SUSE:Linux Enterprise Server 12 SP4Package registry (OSV)
suse:kernel-default4.12.14-122.17.1 · SUSE:Linux Enterprise High Availability Extension 12 SP5Package registry (OSV)
suse:kernel-docs4.12.14-122.17.2 · SUSE:Linux Enterprise Software Development Kit 12 SP5Package registry (OSV)
suse:kernel-livepatch-SLE15_Update_181-1.5.1 · SUSE:Linux Enterprise Live Patching 15Package registry (OSV)
suse:kernel-obs-build4.12.14-122.17.1 · SUSE:Linux Enterprise Software Development Kit 12 SP5Package registry (OSV)
suse:kernel-source4.12.14-122.17.1 · SUSE:Linux Enterprise Server 12 SP5Package registry (OSV)
suse:kernel-source-azure4.12.14-6.37.1 · SUSE:Linux Enterprise Server 12 SP4Package registry (OSV)
suse:kernel-syms4.12.14-122.17.1 · SUSE:Linux Enterprise Server 12 SP5Package registry (OSV)
suse:kernel-syms-azure4.12.14-6.37.1 · SUSE:Linux Enterprise Server 12 SP4Package registry (OSV)
suse:kernel-vanilla4.12.14-150.52.1 · SUSE:Linux Enterprise High Performance Computing 15-ESPOSPackage registry (OSV)
suse:kgraft-patch-SLE12-SP3_Update_311-4.3.1 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:kgraft-patch-SLE12-SP5_Update_31-8.5.1 · SUSE:Linux Enterprise Live Patching 12 SP5Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records