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NVD / CVE Program· CNA Linux

CVE-2022-49561: netfilter: conntrack: re-fetch conntrack after insertion

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: 0.82% (FIRST EPSS); higher than 57.2% of all records.
  • 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 01989d7eebb61c99bd4b88ebc8e261bd2f02caed, 04e4a11dc723c52db7a36dc58f0d69ce6426f8f0, 04f9e9104c969d8ce10a4a43634f641ed082092d.
  • Severity is disputed: the assigning authority (CNA) scores it 9.8, NVD 5.5.

Low priority for now. Upgrade to Linux Linux 01989d7eebb61c99bd4b88ebc8e261bd2f02caed, 04e4a11dc723c52db7a36dc58f0d69ce6426f8f0, 04f9e9104c969d8ce10a4a43634f641ed082092d 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: netfilter: conntrack: re-fetch conntrack after insertion In case the conntrack is clashing, insertion can free skb->_nfct and set skb->_nfct to the already-confirmed entry. This wasn't found before because the conntrack entry and the extension space used to free'd after an rcu grace period, plus the race needs events enabled to trigger.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Feb 26, 2025
Updated
Aug 5, 2026
EPSS
0.8% · 57th percentile
CWE
—

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 · 0.8%

CNA vs NVD score

NVD
5.5
CNA · Linux
9.8
4.3 point gap

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

Follow CVE-2022-49561

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • 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 kernel4.7 and later · before 4.14.282
  • linux linux kernel4.15 and later · before 4.19.246
  • linux linux kernel4.20 and later · before 5.4.197
  • linux linux kernel5.5 and later · before 5.10.120
  • linux linux kernel5.11 and later · before 5.15.45
  • linux linux kernel5.16 and later · before 5.17.13
  • linux linux kernel5.18 and later · before 5.18.2

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

    • 4.7affected
    • 71d8c47fc653711c41bc3282e5b0e605b3727956 and later · before e97222b785e70e8973281666d709baad6523d8afaffected · git
    • 71d8c47fc653711c41bc3282e5b0e605b3727956 and later · before 92a999d1963eed0df666284e20055136ceabd12faffected · git
    • 71d8c47fc653711c41bc3282e5b0e605b3727956 and later · before b16bb373988da3ceb0308381634117e18b6ec60daffected · git
    • 71d8c47fc653711c41bc3282e5b0e605b3727956 and later · before 91a36ec160ec1a0c8f5352b772dffcbb0b6023e3affected · git
    • 71d8c47fc653711c41bc3282e5b0e605b3727956 and later · before 01989d7eebb61c99bd4b88ebc8e261bd2f02caedaffected · git
    • 71d8c47fc653711c41bc3282e5b0e605b3727956 and later · before 04f9e9104c969d8ce10a4a43634f641ed082092daffected · git
    • 71d8c47fc653711c41bc3282e5b0e605b3727956 and later · before 04e4a11dc723c52db7a36dc58f0d69ce6426f8f0affected · git
    • 71d8c47fc653711c41bc3282e5b0e605b3727956 and later · before 56b14ecec97f39118bf85c9ac2438c5a949509edaffected · git
    • before 4.7not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.18.2-15.18.2-1

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-2022-49559Feb 26, 2025 · KVM: x86: Drop WARNs that assert a triple fault never "escapes" from L2
    22Monitor
  • ← EarlierCVE-2022-49560Feb 26, 2025 · exfat: check if cluster num is valid
    28Monitor
  • Later →CVE-2022-49562Feb 26, 2025 · KVM: x86: Use __try_cmpxchg_user() to update guest PTE A/D bits
    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 Linux01989d7eebb61c99bd4b88ebc8e261bd2f02caedVendor (CNA)
Linux Linux04e4a11dc723c52db7a36dc58f0d69ce6426f8f0Vendor (CNA)
Linux Linux04f9e9104c969d8ce10a4a43634f641ed082092dVendor (CNA)
Linux Linux56b14ecec97f39118bf85c9ac2438c5a949509edVendor (CNA)
Linux Linux91a36ec160ec1a0c8f5352b772dffcbb0b6023e3Vendor (CNA)
Linux Linux92a999d1963eed0df666284e20055136ceabd12fVendor (CNA)
Linux Linuxb16bb373988da3ceb0308381634117e18b6ec60dVendor (CNA)
Linux Linuxe97222b785e70e8973281666d709baad6523d8afVendor (CNA)
debian:linux5.18.2-1 · Debian:12Package 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).

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)

—

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 (7 more)

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

All records