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CVE Record

CVE-2022-2586: It was discovered that a nft object or expression could reference a nft set on a different nft table, leadi...

It was discovered that a nft object or expression could reference a nft set on a different nft table, leading to a use-after-free once that table was deleted.

MediumCVSS 5.3Known exploitedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A flaw in Linux nftables can leave behind an invalid memory reference when a referenced table is deleted. A local attacker with some existing privileges could potentially disrupt the system or alter data. The strongest concern is availability: successful exploitation may crash or destabilize the affected host.

Executive priority

Treat this as a high-priority remediation because CISA lists it as known exploited. The medium CVSS score and local, high-complexity prerequisites support risk-based sequencing rather than an internet-wide emergency response. Address systems permitting untrusted local execution first, then complete fleet-wide vendor-guided validation.

Technical view

An nftables object or expression can reference a set belonging to another table without safe lifetime handling. Deleting that table can leave a dangling reference, causing a use-after-free. CVSS 3.1 rates it 5.3: local access, low privileges, high complexity, no user interaction, low integrity impact, high availability impact, and no confidentiality impact.

Likely exposure

Exposure is limited to Linux installations running vulnerable kernel packages. The bundle lists versions 3.16, 4.15, 4.20, 5.5, 5.11, 5.16, and 5.19. Distribution backports make version strings alone unreliable. Exploitation requires local access and low privileges, with high attack complexity.

Exploitation context

CISA KEV inclusion supports active exploitation. However, the supplied evidence provides no campaign, victim, or exploit-chain details. The local attack vector reduces direct remote exposure, but an attacker who already has local access could use the flaw to substantially affect system availability.

Researcher notes

The defect concerns cross-table nftables reference lifetime handling and CWE-416 use-after-free. Confirm affected and fixed package revisions through distribution advisories and the kernel discussion. The supplied version list is too coarse to determine exposure where vendors have backported fixes. Available evidence supports integrity and availability impact, but not confidentiality impact.

Mitigation direction

  • Consult the applicable Linux distributor advisory and install the fixed kernel package for the exact operating-system release.
  • Prioritize shared systems and hosts where untrusted or lower-privileged users can execute local code.
  • Use only vendor-documented temporary mitigations if immediate kernel updating is unavailable.
  • Ensure the updated kernel is activated according to the distributor's installation guidance.

Validation and detection

  • Record the running kernel version, distribution release, package revision, and architecture.
  • Compare the installed package revision against the applicable distributor advisory; do not rely solely on upstream version numbers.
  • Verify the remediated kernel is currently running, rather than merely installed.
  • Review whether lower-privileged accounts can access relevant nftables functionality beyond intended authorization.
Prepared
Confidence
medium
Sources
7

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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-416: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2022-2586 mapping review

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

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.3 (3.1)
Known Exploited
Yes
Published

Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/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
5Timeline events
2ADP providers
16Source links

CISA KEV status

Status
Known exploited
Source
CISA-ADP
Date added
KEV reference

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: activeAutomatable: noTechnical Impact: total

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
5.3CVSS 3.1MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H14.2canonical

Vulnerability scoring details

Base CVSS 3.1 score

5.3Medium
CVSS 3.1 vector shape for CVE-2022-2586Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. Added to KEVCISA-ADP

    CISA Known Exploited Vulnerabilities metadata lists this CVE as known exploited.

  4. ADP timelineCISA-ADP

    CVE-2022-2586 added to CISA KEV

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvcother:kev
  • 2024-06-26T00:00:00.000Z: CVE-2022-2586 added to CISA KEV
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
The Linux Kernel Organizationlinuxlinux, 3.16, 4.15, 4.20, 5.5, 5.11, 5.16, 5.19unaffected
Weakness

CWE details

CWE-416

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

CWE-416 · source CWE mapping

Use After Free

Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs