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CVE-2022-29581· NVD / CVE Program· CNA Google

Improper Update of Reference Count vulnerability in net/sched of Linux Kernel allows local attacker to cause privilege escalation to root.

Improper Update of Reference Count vulnerability in net/sched of Linux Kernel allows local attacker to cause privilege escalation to root. This issue affects: Linux Kernel versions prior to 5.18; version 4.14 and later versions.

HighCVSS 7.8 · v3.1—Proof of concept Fix available
Published
May 17, 2022
Updated
Jun 17, 2026
EPSS
0.9% · 59th percentile
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Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.9%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.8
CNA · Google
7.8
agree

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

Noroxi analysis

No Noroxi analysis for this record yet

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Affected systems

VendorProduct
linuxlinux kernel
debiandebian linux
canonicalubuntu linux
netapph300s firmware
netapph300s
netapph500s firmware
netapph500s
netapph700s firmware
netapph700s
netapph300e firmware
netapph300e
netapph500e firmware

and 7 more

Affected versions

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

  • canonical ubuntu linux14.04
  • canonical ubuntu linux16.04
  • canonical ubuntu linux18.04
  • canonical ubuntu linux20.04
  • canonical ubuntu linux22.04
  • debian debian linux10.0
  • linux linux kernel4.14 and later · before 4.14.278
  • linux linux kernel4.15 and later · before 4.19.241
  • linux linux kernel4.20 and later · before 5.4.191
  • linux linux kernel5.5 and later · before 5.10.113
  • linux linux kernel5.11 and later · before 5.15.36
  • linux linux kernel5.16 and later · before 5.17.5
  • netapp h300e firmwareall versions
  • netapp h300s firmwareall versions
  • netapp h410c firmwareall versions
  • netapp h410s firmwareall versions
  • netapp h500e firmwareall versions
  • netapp h500s firmwareall versions
  • netapp h700e firmwareall versions
  • netapp h700s firmwareall versions

Versions reported by the vendor

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

  • Linux Kernel

    • unspecified and later · before 5.18affected
    • 4.14 and later · before unspecifiedaffected

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.17.6-15.17.6-1
openSUSE:Leap 15.3dtb-aarch64before 5.3.18-150300.59.90.15.3.18-150300.59.90.1
openSUSE:Leap 15.3kernel-debugbefore 5.3.18-150300.59.90.15.3.18-150300.59.90.1
openSUSE:Leap 15.3kernel-debugbefore 4.12.14-150100.197.123.14.12.14-150100.197.123.1
openSUSE:Leap 15.3kernel-kvmsmallbefore 5.3.18-150300.59.90.15.3.18-150300.59.90.1
openSUSE:Leap 15.3kernel-kvmsmallbefore 4.12.14-150100.197.123.14.12.14-150100.197.123.1
openSUSE:Leap 15.3kernel-obs-qabefore 5.3.18-150300.59.90.15.3.18-150300.59.90.1
openSUSE:Leap 15.3kernel-vanillabefore 4.12.14-150100.197.123.14.12.14-150100.197.123.1
openSUSE:Leap 15.4dtb-aarch64before 5.14.21-150400.24.18.15.14.21-150400.24.18.1
openSUSE:Leap 15.4kernel-debugbefore 5.14.21-150400.24.18.15.14.21-150400.24.18.1
openSUSE:Leap 15.4kernel-kvmsmallbefore 5.14.21-150400.24.18.15.14.21-150400.24.18.1
openSUSE:Leap 15.4kernel-obs-qabefore 5.14.21-150400.24.18.15.14.21-150400.24.18.1
openSUSE:Leap Micro 5.2kernel-rtbefore 5.3.18-150300.99.15.3.18-150300.99.1
Red Hat:rhel_eus:8.6::baseosbpftoolbefore 0:4.18.0-372.93.1.el8_60:4.18.0-372.93.1.el8_6
Red Hat:rhel_eus:8.6::baseoskernelbefore 0:4.18.0-372.93.1.el8_60:4.18.0-372.93.1.el8_6
Red Hat:rhel_eus:8.6::baseoskernel-abi-stablelistsbefore 0:4.18.0-372.93.1.el8_60:4.18.0-372.93.1.el8_6
Red Hat:rhel_eus:8.6::baseoskernel-corebefore 0:4.18.0-372.93.1.el8_60:4.18.0-372.93.1.el8_6
Red Hat:rhel_eus:8.6::baseoskernel-debugbefore 0:4.18.0-372.93.1.el8_60:4.18.0-372.93.1.el8_6
Red Hat:rhel_eus:8.6::baseoskernel-debug-corebefore 0:4.18.0-372.93.1.el8_60:4.18.0-372.93.1.el8_6
Red Hat:rhel_eus:8.6::baseoskernel-debug-develbefore 0:4.18.0-372.93.1.el8_60:4.18.0-372.93.1.el8_6
Red Hat:rhel_eus:8.6::baseoskernel-debug-modulesbefore 0:4.18.0-372.93.1.el8_60:4.18.0-372.93.1.el8_6
Red Hat:rhel_eus:8.6::baseoskernel-debug-modules-extrabefore 0:4.18.0-372.93.1.el8_60:4.18.0-372.93.1.el8_6
Red Hat:rhel_eus:8.6::baseoskernel-debuginfo-common-aarch64before 0:4.18.0-372.93.1.el8_60:4.18.0-372.93.1.el8_6
Red Hat:rhel_eus:8.6::baseoskernel-debuginfo-common-ppc64lebefore 0:4.18.0-372.93.1.el8_60:4.18.0-372.93.1.el8_6

+96

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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:linux5.17.6-1 · Debian:12Package registry (OSV)
opensuse:kernel-azure5.14.21-150400.14.10.1 · openSUSE:Leap 15.4Package registry (OSV)
opensuse:kernel-source-azure5.14.21-150400.14.10.1 · openSUSE:Leap 15.4Package registry (OSV)
opensuse:kernel-syms-azure5.14.21-150400.14.10.1 · openSUSE:Leap 15.4Package registry (OSV)
red hat:bpftool0:4.18.0-372.93.1.el8_6 · Red Hat:rhel_eus:8.6::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-372.93.1.el8_6 · Red Hat:rhev_hypervisor:4.4::el8Package registry (OSV)
red hat:kernel0:4.18.0-372.93.1.el8_6 · Red Hat:rhel_eus:8.6::baseosPackage registry (OSV)
red hat:kernel-abi-stablelists0:4.18.0-372.93.1.el8_6 · Red Hat:rhel_eus:8.6::baseosPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.18.0-372.93.1.el8_6 · Red Hat:rhev_hypervisor:4.4::el8Package registry (OSV)
red hat:kernel-debuginfo0:4.18.0-372.93.1.el8_6 · Red Hat:rhev_hypervisor:4.4::el8Package registry (OSV)
red hat:kernel-debuginfo-common-x86_640:4.18.0-372.93.1.el8_6 · Red Hat:rhev_hypervisor:4.4::el8Package registry (OSV)
red hat:kernel-devel0:4.18.0-372.93.1.el8_6 · Red Hat:rhev_hypervisor:4.4::el8Package registry (OSV)
red hat:kernel-tools-debuginfo0:4.18.0-372.93.1.el8_6 · Red Hat:rhev_hypervisor:4.4::el8Package registry (OSV)
red hat:perf0:4.18.0-372.93.1.el8_6 · Red Hat:rhev_hypervisor:4.4::el8Package registry (OSV)
red hat:perf-debuginfo0:4.18.0-372.93.1.el8_6 · Red Hat:rhev_hypervisor:4.4::el8Package registry (OSV)
red hat:python3-perf-debuginfo0:4.18.0-372.93.1.el8_6 · Red Hat:rhev_hypervisor:4.4::el8Package registry (OSV)
suse:kernel-64kb5.14.21-150400.24.18.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP4Package registry (OSV)
suse:kernel-azure5.14.21-150400.14.10.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP4Package registry (OSV)
suse:kernel-default5.14.21-150400.24.18.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP4Package registry (OSV)
suse:kernel-default-base5.14.21-150400.24.18.1.150400.24.5.4 · SUSE:Linux Enterprise Module for Basesystem 15 SP4Package registry (OSV)
suse:kernel-docs5.14.21-150400.24.18.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP4Package registry (OSV)
suse:kernel-source5.14.21-150400.24.18.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP4Package registry (OSV)
suse:kernel-source-azure5.14.21-150400.14.10.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP4Package registry (OSV)
suse:kernel-syms-azure5.14.21-150400.14.10.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP4Package registry (OSV)
suse:kernel-zfcpdump5.14.21-150400.24.18.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP4Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×2

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02022-12-23
Proof-of-concept repository on GitHubstars:02022-12-23

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.

  1. Published
  2. First PoC+219 d
  3. TodayOct 2, 2026+1599 d
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.

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

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

CVSS vector

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

All records