CVE-2022-49110

Service disruption via conntrack garbage-collection event overflow

Published Feb 26, 2025 · Updated Aug 5, 2026

Resource-management flaw in the Linux kernel allows local users to interrupt service by pressuring a large conntrack table. In net/netfilter/nf_conntrack_core.c, garbage collection waits two minutes and evicts most entries in one worker pass, overflowing collected netlink events. Exploitation requires low-privileged local access and a system with a large conntrack hash table; the reported consequence is availability loss without confidentiality or integrity impact.

CVSS severity5.5
Medium
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource-management flaw in the Linux kernel allows local users to interrupt service by pressuring a large conntrack table. In net/netfilter/nf_conntrack_core.c, garbage collection waits two minutes and evicts most entries in one worker pass, overflowing collected netlink events. Exploitation requires low-privileged local access and a system with a large conntrack hash table; the reported consequence is availability loss without confidentiality or integrity impact.

The record

CVE
CVE-2022-49110
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.19.206 <4.20
  2. Affected versionversion=4608fdfc07e116f9fc0895beb40abad7cdb5ee3d <2cfadb761d3d0219412fd8150faea60c7e863833
  3. Affected versionversion=4608fdfc07e116f9fc0895beb40abad7cdb5ee3d <58d52743ae85d28c9335c6034d6ce350b8689951
  4. Affected versionversion=4608fdfc07e116f9fc0895beb40abad7cdb5ee3d <592e57591826f3d09c28d755a39ea8e9d13705ad
  5. Affected versionversion=4608fdfc07e116f9fc0895beb40abad7cdb5ee3d <7cd361d5e6d986c0d4cafb9ceaa803359048ae15
  6. Affected versionversion=5.10.62 <5.11
  7. Affected versionversion=5.13.14 <5.14
  8. Affected versionversion=5.14
  9. Affected versionversion=5.4.144 <5.5
  10. Affected versionversion=5892f910f401c1facfc410e0b042108f2827a77b
  11. Affected versionversion=7aa03980b21fdc7355e20274a68a69a0b2a45c08
  12. Affected versionversion=dafc95a1e473a0b857af34ecbb17b8b1c90edd75
  13. Affected versionversion=f68ad168e23565ce2a3891fec537cfaf8410d1e6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.19.206 <4.20; version=4608fdfc07e116f9fc0895beb40abad7cdb5ee3d <2cfadb761d3d0219412fd8150faea60c7e863833; version=4608fdfc07e116f9fc0895beb40abad7cdb5ee3d <58d52743ae85d28c9335c6034d6ce350b8689951; version=4608fdfc07e116f9fc0895beb40abad7cdb5ee3d <592e57591826f3d09c28d755a39ea8e9d13705ad; version=4608fdfc07e116f9fc0895beb40abad7cdb5ee3d <7cd361d5e6d986c0d4cafb9ceaa803359048ae15; version=5.10.62 <5.11; version=5.13.14 <5.14; version=5.14; version=5.4.144 <5.5; version=5892f910f401c1facfc410e0b042108f2827a77b; version=7aa03980b21fdc7355e20274a68a69a0b2a45c08; version=dafc95a1e473a0b857af34ecbb17b8b1c90edd75; version=f68ad168e23565ce2a3891fec537cfaf8410d1e6

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.5CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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