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CVE Record

CVE-2022-36946: nfqnl_mangle in net/netfilter/nfnetlink_queue.c in the Linux kernel through 5.18.14 allows remote attackers...

nfqnl_mangle in net/netfilter/nfnetlink_queue.c in the Linux kernel through 5.18.14 allows remote attackers to cause a denial of service (panic) because, in the case of an nf_queue verdict with a one-byte nfta_payload attribute, an skb_pull can encounter a negative skb->len.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2022-36946 is a Linux kernel denial-of-service flaw. A remote attacker could trigger a kernel panic, causing an affected system to crash. The business risk is service outage, especially for internet-facing Linux systems or appliances that process network traffic through netfilter queue functionality.

Executive priority

Prioritize remediation for exposed network infrastructure and high-availability systems. The issue can crash affected hosts remotely, so the main business concern is outage rather than data theft. No source in the bundle proves active exploitation.

Technical view

The flaw is in nfqnl_mangle in net/netfilter/nfnetlink_queue.c through Linux 5.18.14. A malformed one-byte nfta_payload attribute during an nf_queue verdict can cause skb_pull to encounter a negative skb->len, leading to a kernel panic. Public sources identify availability impact, not confidentiality or integrity impact.

Likely exposure

Exposure is most likely on Linux systems through 5.18.14 using netfilter/NFQUEUE packet handling, including firewalls, gateways, containers hosts, or appliances with affected kernels. The source bundle does not provide a complete affected product matrix.

Exploitation context

The CVSS vector is network, low complexity, no privileges, and no user interaction. The CVE is not listed as KEV in the bundle, and no cited source here confirms active exploitation. Treat exploit status as unconfirmed.

Researcher notes

The key upstream evidence is Linux commit 99a63d36cb3ed5ca3aa6fcb64cffbeaf3b0fb164 and the netfilter-devel discussion. Affected-product metadata is sparse in the CVE bundle, so distribution and vendor advisories should drive precise scoping.

Mitigation direction

  • Apply vendor kernel security updates for affected Linux distributions and appliances.
  • Prioritize internet-facing packet filtering, gateway, and network inspection systems.
  • For Debian systems, review DSA-5207 and related LTS advisories.
  • For NetApp products, follow the NetApp advisory for product-specific guidance.
  • If no vendor fix is available, reduce exposure of affected packet-processing paths.

Validation and detection

  • Inventory Linux kernel versions and identify systems running 5.18.14 or earlier.
  • Identify systems using netfilter queue or NFQUEUE-based packet processing.
  • Check whether vendor packages include the upstream kernel fix commit.
  • Review Debian and appliance vendor advisories for patched package versions.
  • Confirm critical network systems have received tested kernel updates.
Prepared
Confidence
medium
Sources
8

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2022-36946 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
7Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2022-36946Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.