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NVD / CVE Program· CNA Linux

CVE-2021-47559: net/smc: Fix NULL pointer dereferencing in smc_vlan_by_tcpsk()

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: 0.46% (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 Linux 587acad41f1bc48e16f42bb2aca63bf323380be8, bb851d0fb02547d03cd40106b5f2391c4fed6ed1, c94cbd262b6aa3b54d73a1ed1f9c0d19df57f4ff.
  • Severity is disputed: the assigning authority (CNA) scores it 7.5, NVD 5.5.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 587acad41f1bc48e16f42bb2aca63bf323380be8, bb851d0fb02547d03cd40106b5f2391c4fed6ed1, c94cbd262b6aa3b54d73a1ed1f9c0d19df57f4ff 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, the following vulnerability has been resolved: net/smc: Fix NULL pointer dereferencing in smc_vlan_by_tcpsk() Coverity reports a possible NULL dereferencing problem: in smc_vlan_by_tcpsk(): 6. returned_null: netdev_lower_get_next returns NULL (checked 29 out of 30 times). 7. var_assigned: Assigning: ndev = NULL return value from netdev_lower_get_next. 1623 ndev = (struct net_device *)netdev_lower_get_next(ndev, &lower); CID 1468509 (#1 of 1): Dereference null return value (NULL_RETURNS) 8. dereference: Dereferencing a pointer that might be NULL ndev when calling is_vlan_dev. 1624 if (is_vlan_dev(ndev)) { Remove the manual implementation and use netdev_walk_all_lower_dev() to iterate over the lower devices. While on it remove an obsolete function parameter comment.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 24, 2024
Updated
Aug 5, 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%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.5
CNA · Linux
7.5
2.0 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

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

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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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

Affected versions

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

  • linux linux kernel4.18 and later · before 5.10.83
  • linux linux kernel5.11 and later · before 5.15.6

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.18affected
    • cb9d43f6775457cac75544bc4197f26ac2b6f294 and later · before c94cbd262b6aa3b54d73a1ed1f9c0d19df57f4ffaffected · git
    • cb9d43f6775457cac75544bc4197f26ac2b6f294 and later · before bb851d0fb02547d03cd40106b5f2391c4fed6ed1affected · git
    • cb9d43f6775457cac75544bc4197f26ac2b6f294 and later · before 587acad41f1bc48e16f42bb2aca63bf323380be8affected · git
    • before 4.18not affected · semver
    • 5.10.83 and later · up to and including 5.10.*not affected · semver
    • 5.15.6 and later · up to and including 5.15.*not affected · semver
    • 5.16 and laternot affected · original_commit_for_fix

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.15.15-15.15.15-1
Red Hat:rhel_e4s:9.0::appstreambpftool-debuginfobefore 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-debug-debuginfobefore 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-debug-develbefore 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-debug-devel-matchedbefore 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-debuginfobefore 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-debuginfo-common-aarch64before 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-debuginfo-common-ppc64lebefore 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-debuginfo-common-s390xbefore 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-debuginfo-common-x86_64before 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-develbefore 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-devel-matchedbefore 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-docbefore 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-tools-debuginfobefore 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-zfcpdump-debuginfobefore 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-zfcpdump-develbefore 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamkernel-zfcpdump-devel-matchedbefore 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamperfbefore 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::appstreamperf-debuginfobefore 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::appstreampython3-perf-debuginfobefore 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::baseosbpftoolbefore 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::baseoskernelbefore 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::baseoskernel-abi-stablelistsbefore 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0
Red Hat:rhel_e4s:9.0::baseoskernel-corebefore 0:5.14.0-70.117.1.el9_00:5.14.0-70.117.1.el9_0

+38

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-2021-47557May 24, 2024 · net/sched: sch_ets: don't peek at classes beyond 'nbands'
    22Monitor
  • ← EarlierCVE-2021-47558May 24, 2024 · net: stmmac: Disable Tx queues when reconfiguring the interface
    22Monitor
  • Later →CVE-2021-47560May 24, 2024 · mlxsw: spectrum: Protect driver from buggy firmware
    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
Linux Linux587acad41f1bc48e16f42bb2aca63bf323380be8Vendor (CNA)
Linux Linuxbb851d0fb02547d03cd40106b5f2391c4fed6ed1Vendor (CNA)
Linux Linuxc94cbd262b6aa3b54d73a1ed1f9c0d19df57f4ffVendor (CNA)
debian:linux5.15.15-1 · Debian:12Package registry (OSV)
red hat:kernel-rt0:5.14.0-70.117.1.rt21.189.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)
red hat:kernel-rt-core0:5.14.0-70.117.1.rt21.189.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)
red hat:kernel-rt-debug0:5.14.0-70.117.1.rt21.189.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)
red hat:kernel-rt-debug-core0:5.14.0-70.117.1.rt21.189.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)
red hat:kernel-rt-debug-debuginfo0:5.14.0-70.117.1.rt21.189.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)
red hat:kernel-rt-debug-devel0:5.14.0-70.117.1.rt21.189.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)
red hat:kernel-rt-debug-kvm0:5.14.0-70.117.1.rt21.189.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)
red hat:kernel-rt-debug-modules0:5.14.0-70.117.1.rt21.189.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)
red hat:kernel-rt-debug-modules-extra0:5.14.0-70.117.1.rt21.189.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)
red hat:kernel-rt-debuginfo0:5.14.0-70.117.1.rt21.189.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)
red hat:kernel-rt-debuginfo-common-x86_640:5.14.0-70.117.1.rt21.189.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)
red hat:kernel-rt-devel0:5.14.0-70.117.1.rt21.189.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)
suse:kernel-default4.12.14-122.225.1 · SUSE:Linux Enterprise High Availability Extension 12 SP5Package registry (OSV)
suse:kernel-docs4.12.14-122.225.2 · SUSE:Linux Enterprise Software Development Kit 12 SP5Package registry (OSV)
suse:kernel-obs-build4.12.14-122.225.1 · SUSE:Linux Enterprise Software Development Kit 12 SP5Package registry (OSV)
suse:kernel-rt4.12.14-10.197.1 · SUSE:Linux Enterprise Real Time 12 SP5Package registry (OSV)
suse:kernel-rt_debug4.12.14-10.197.1 · SUSE:Linux Enterprise Real Time 12 SP5Package registry (OSV)
suse:kernel-source4.12.14-122.225.1 · SUSE:Linux Enterprise Server 12 SP5Package registry (OSV)
suse:kernel-source-rt4.12.14-10.197.1 · SUSE:Linux Enterprise Real Time 12 SP5Package registry (OSV)
suse:kernel-syms4.12.14-122.225.1 · SUSE:Linux Enterprise Server 12 SP5Package registry (OSV)
suse:kernel-syms-rt4.12.14-10.197.1 · SUSE:Linux Enterprise Real Time 12 SP5Package registry (OSV)
suse:kgraft-patch-SLE12-SP5_Update_591-8.3.1 · 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.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

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

No commit or PR link among the references.

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 (2 more)

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

All records