Security readout for executives and security teams
Plain-English summary
A flaw in Linux Bluetooth advertising-data creation can overfill available space when adding flags or transmit-power information, causing crashes. The supplied CVSS rating is 7.8 and indicates a local, low-privileged attacker could potentially affect confidentiality, integrity, and availability without user interaction.
Executive priority
Treat this as a high-priority kernel maintenance issue, especially for Bluetooth-enabled shared systems. It is not supported as an internet-scale or actively exploited emergency. Accelerate vendor-patched kernel deployment while confirming actual Bluetooth exposure and local-user access.
Technical view
The Linux Bluetooth eir_create_adv_data function could add EIR_FLAGS and EIR_TX_POWER fields without first confirming they fit in the destination. The kernel stable commits add the missing capacity handling. The bundle identifies affected Linux kernel releases but does not provide distribution-specific package mappings.
Likely exposure
Exposure is most likely on systems running an affected Linux kernel where Bluetooth functionality and the relevant advertising-data path are available. Prioritise shared endpoints, Bluetooth-enabled appliances, and systems where untrusted users can obtain local low-privileged access. Distribution backports may make version-only assessment unreliable.
Exploitation context
The supplied CVSS vector requires local access and low privileges, with no user interaction. CISA KEV status is false, and the bundle provides no evidence of active exploitation or a public proof of concept. Practical reachability and reliability are not established by these sources.
Researcher notes
The source bundle supplies no CWE and describes possible crashes from missing size checks. Four stable-kernel commits are referenced, suggesting branch-specific fixes. Exact vulnerable ranges and distribution backports remain ambiguous; validate through vendor package provenance rather than comparing only upstream version strings.
Mitigation direction
- Install a vendor kernel containing the applicable upstream stable fix or confirmed backport.
- Check distribution and device-vendor advisories for fixed package versions.
- Prioritise Bluetooth-enabled systems accessible to untrusted local users.
- Apply vendor-recommended temporary controls if immediate kernel updating is unavailable.
Validation and detection
- Record each system's running kernel build and distribution package revision.
- Confirm vendor documentation maps the installed package to an upstream fixing commit.
- Verify whether Bluetooth is enabled and the affected advertising path is operational.
- After updating, reboot and confirm the fixed kernel is running.
- Monitor kernel logs for Bluetooth-related crashes or memory-safety warnings.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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-2025-38303 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
CVSS vector scores
1 official scoreWe 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.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9LinuxVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/2d4588f55cc10fc228f3b46469dbfb3f0a8b13c8CVE reference, Linux
- https://git.kernel.org/stable/c/2af40d795d3fb0ee5c074b7ac56ab22402aa6e4fCVE reference, Linux
- https://git.kernel.org/stable/c/b9db0c27e73b7c8a19384a44af527edfda74ff3dCVE reference, Linux
- https://git.kernel.org/stable/c/47c03902269aff377f959dc3fd94a9733aa31d6eCVE reference, Linux
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.