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CVE Record

CVE-2022-48643: netfilter: nf_tables: fix nft_counters_enabled underflow at nf_tables_addchain()

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix nft_counters_enabled underflow at nf_tables_addchain() syzbot is reporting underflow of nft_counters_enabled counter at nf_tables_addchain() [1], for commit 43eb8949cfdffa76 ("netfilter: nf_tables: do not leave chain stats enabled on error") missed that nf_tables_chain_destroy() after nft_basechain_init() in the error path of nf_tables_addchain() decrements the counter because nft_basechain_init() makes nft_is_base_chain() return true by setting NFT_CHAIN_BASE flag. Increment the counter immediately after returning from nft_basechain_init().

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2022-48643 is a Linux kernel nf_tables bug where an internal counter can underflow during chain creation error handling. The provided sources do not include CVSS, impact details, or confirmed exploitation. Treat it as a kernel maintenance risk until vendor-specific advisories clarify severity.

Executive priority

Monitor and patch through normal kernel update processes unless a vendor rates your deployed kernel as higher risk. There is no provided evidence of active exploitation or a defined business-impact severity.

Technical view

The issue is in netfilter nf_tables: nf_tables_addchain() can call nf_tables_chain_destroy() after nft_basechain_init(), which sets NFT_CHAIN_BASE and causes nft_counters_enabled to be decremented without the expected prior increment. Kernel stable commits adjust the counter handling after nft_basechain_init().

Likely exposure

Exposure appears limited to Linux systems with kernels containing the affected nf_tables logic. The bundle does not provide distribution package names, CPEs, or a complete affected-version range, so asset mapping needs vendor kernel data.

Exploitation context

The source bundle does not report active exploitation, and KEV is false. No exploit prerequisites, attack path, or practical impact are stated in the provided sources.

Researcher notes

The record describes a counter-underflow fix found by syzbot in nf_tables_addchain() error handling. Evidence is incomplete for exploitability, privilege requirements, and impact. Avoid assuming denial of service, privilege escalation, or remote exposure without vendor analysis.

Mitigation direction

  • Check Linux distribution advisories for CVE-2022-48643 package guidance.
  • Update kernels to vendor releases containing the referenced stable fixes.
  • Prioritize systems using nftables or netfilter-heavy firewalling.
  • Track whether vendors rate this as security-impacting for your kernel branch.

Validation and detection

  • Inventory Linux kernel versions across servers, appliances, and containers hosts.
  • Confirm vendor kernel packages include the referenced stable fix commits.
  • Identify systems relying on nftables-based firewall or filtering rules.
  • Review vulnerability scanner findings against vendor-specific advisories.
Prepared
Confidence
medium
Sources
6

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-2022-48643 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
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.

0CVSS vectors
3Timeline events
2ADP providers
5Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

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. CVE updatedCVE Program

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

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxc907dfe4eaca9665694a0340de1458a093abe354, 6d7ddee503951641f3ec6f0e3269446970bbcdab, 98a621ef45e3605c7487f7fa6fec7df94697d6a2, 43eb8949cfdffa764b92bc6c54b87cbe5b0003feunaffected
LinuxLinux5.10.140, 5.15.64, 5.19.6unaffected
Weakness

CWE details

No CWE listed

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