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CVE Record

CVE-2024-43879: wifi: cfg80211: handle 2x996 RU allocation in cfg80211_calculate_bitrate_he()

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: handle 2x996 RU allocation in cfg80211_calculate_bitrate_he() Currently NL80211_RATE_INFO_HE_RU_ALLOC_2x996 is not handled in cfg80211_calculate_bitrate_he(), leading to below warning: kernel: invalid HE MCS: bw:6, ru:6 kernel: WARNING: CPU: 0 PID: 2312 at net/wireless/util.c:1501 cfg80211_calculate_bitrate_he+0x22b/0x270 [cfg80211] Fix it by handling 2x996 RU allocation in the same way as 160 MHz bandwidth.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel Wi-Fi defect in cfg80211 bitrate calculation for a specific Wi-Fi 6 RU allocation. The reported impact is a kernel warning, not a clearly documented compromise path. Treat it as a routine kernel maintenance issue unless affected systems are safety-critical, embedded, or exposed to unusual wireless traffic conditions.

Executive priority

Schedule normal patch-cycle remediation. Escalate only where Linux Wi-Fi is used in operational technology, appliances, or managed endpoints with strict reliability requirements. Current sources do not justify emergency response.

Technical view

cfg80211_calculate_bitrate_he() did not handle NL80211_RATE_INFO_HE_RU_ALLOC_2x996, producing an invalid HE MCS warning. The kernel fix handles 2x996 RU allocation like 160 MHz bandwidth. Sources do not provide CVSS, CWE, a crash-to-compromise chain, or confirmed exploitation.

Likely exposure

Exposure is most plausible on Linux systems using affected kernel versions with Wi-Fi/cfg80211 HE support. Servers without Wi-Fi hardware or disabled wireless stacks are less likely to be practically exposed. Distribution and vendor kernel backports may change version-based conclusions.

Exploitation context

The bundle does not show CISA KEV listing or any cited active exploitation. Public evidence describes a resolved kernel warning condition. No source here proves remote code execution, privilege escalation, or a weaponized exploit.

Researcher notes

The source record is thin: no CVSS, CWE, exploit status, or full impact analysis. Focus validation on affected kernel branches, downstream backports, wireless capability, and whether the warning can affect reliability in the local deployment context.

Mitigation direction

  • Update to vendor-supported kernels containing the stable cfg80211 fix.
  • Apply Debian LTS or device-vendor kernel updates where applicable.
  • Check Siemens advisories for affected industrial product guidance.
  • Prioritize embedded or wireless-enabled Linux assets over non-Wi-Fi servers.
  • Avoid direct wrangler or deployment assumptions; follow normal OS patch governance.

Validation and detection

  • Inventory Linux kernel versions on wireless-enabled assets.
  • Confirm whether cfg80211 and Wi-Fi 6 HE functionality are present.
  • Compare installed kernels against vendor fixed packages or stable commits.
  • Review kernel logs for invalid HE MCS warnings.
  • Verify Debian or vendor advisory status for managed distributions.
Prepared
Confidence
medium
Sources
10

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-2024-43879 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
3ADP providers
13Source 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
siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxc4cbaf7973a794839af080f13748335976cf3f3f, c4cbaf7973a794839af080f13748335976cf3f3f, c4cbaf7973a794839af080f13748335976cf3f3f, c4cbaf7973a794839af080f13748335976cf3f3f, c4cbaf7973a794839af080f13748335976cf3f3f, c4cbaf7973a794839af080f13748335976cf3f3f, c4cbaf7973a794839af080f13748335976cf3f3f, c4cbaf7973a794839af080f13748335976cf3f3funaffected
LinuxLinux4.19, 0, 4.19.320, 5.4.282, 5.10.224, 5.15.165, 6.1.103, 6.6.44, 6.10.3, 6.11affected
Weakness

CWE details

No CWE listed

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