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CVE Record

CVE-2025-39849: wifi: cfg80211: sme: cap SSID length in __cfg80211_connect_result()

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: sme: cap SSID length in __cfg80211_connect_result() If the ssid->datalen is more than IEEE80211_MAX_SSID_LEN (32) it would lead to memory corruption so add some bounds checking.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2025-39849 is a Linux kernel Wi-Fi bug where an oversized SSID length can corrupt memory during connection result handling. The public record names a kernel fix that caps SSID length at 32 bytes. Severity and CVSS are not provided, so business impact depends on wireless use and kernel versions in scope.

Executive priority

Handle as a targeted kernel patching item for wireless-enabled Linux fleets. Urgency is higher for unmanaged, embedded, or industrial devices, but the public evidence does not justify claiming active exploitation or critical severity.

Technical view

The issue is in cfg80211 SME handling, specifically __cfg80211_connect_result(). If ssid->datalen exceeds IEEE80211_MAX_SSID_LEN, the kernel can corrupt memory. Upstream stable commit references are provided, and Debian LTS and Siemens advisories are listed, but the bundle does not provide exploitability details or a CVSS score.

Likely exposure

Most relevant to Linux systems with Wi-Fi capability, including embedded, industrial, laptop, and appliance deployments. The affected-version data in the bundle is incomplete and commit-range shaped, so exposure should be checked against vendor kernels and distribution backports rather than raw upstream version numbers alone.

Exploitation context

The source bundle does not show active exploitation, public exploit availability, or CISA KEV listing. It only states memory corruption from SSID length handling. Treat attack conditions and impact as not fully established from the provided evidence.

Researcher notes

Focus review on cfg80211 SME connection result paths and the added bounds check against IEEE80211_MAX_SSID_LEN. The bundle lacks CVSS, CWE, exploit primitives, and reachable attacker model, so avoid conclusions beyond memory corruption without reviewing linked commits and vendor advisories.

Mitigation direction

  • Apply vendor kernel updates that include the referenced cfg80211 SSID length fix.
  • Prioritize wireless-enabled Linux systems and embedded products using affected kernels.
  • Check Debian LTS and Siemens advisories if those environments are in scope.
  • If no vendor package exists, track upstream stable fixes and vendor backports.
  • Reduce unnecessary Wi-Fi exposure on systems awaiting validated updates.

Validation and detection

  • Inventory Linux kernel versions on wireless-capable assets.
  • Confirm whether vendor advisories mark your build as affected or fixed.
  • Map deployed kernels to distribution backports, not only upstream version strings.
  • Verify update packages include the cfg80211 connect-result SSID length bounds check.
  • Document exceptions where Wi-Fi hardware or cfg80211 paths are absent.
Prepared
Confidence
medium
Sources
9

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-2025-39849 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
8Source links

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

CVECVE Program Container
siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxdd43f8f90206054e7da7593de0a334fb2cd0ea88, c38c701851011c94ce3be1ccb3593678d2933fd8, c38c701851011c94ce3be1ccb3593678d2933fd8, c38c701851011c94ce3be1ccb3593678d2933fd8, c38c701851011c94ce3be1ccb3593678d2933fd8, bf3c348c5fdcf00a7eeed04a1b83e454d2dca2e5, 6.1.16, 6.2.3unaffected
LinuxLinux6.3, 0, 6.1.151, 6.6.105, 6.12.46, 6.16.6, 6.17affected
Weakness

CWE details

No CWE listed

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