CVE-2025-38303: Bluetooth: eir: Fix possible crashes on eir_create_adv_data

mediumCVSS 4.4CVE-2025-38303

CSIRTS triage

vendor: Linux product: Linux Kernel Denial of service

What: Unsafe pointer operations in Bluetooth EIR advertisement data creation can cause kernel crashes.
Who is affected: Linux systems with Bluetooth enabled are potentially affected by crafted advertisement packets.
Urgency: Medium priority; remote crash possible via malformed Bluetooth advertisements but requires local Bluetooth access.
Action: Apply kernel patches addressing CVE-2025-38303 to fix eir_create_adv_data.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 4.4
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-38303

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2025-383030.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 5% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2025-38303	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[UPDATE] [high] Linux Kernel: Multiple vulnerabilities allow denial of servicecert-bund

Recent advisories for Bluetooth

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

medium[UPDATE] [medium] Linux Kernel (Bluetooth): Multiple vulnerabilitiescert-bund · 2026-08-06
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highCVE-2025-21969: Bluetooth: L2CAP: Fix slab-use-after-free Read in l2cap_send_cmdmsrc · 2026-08-06
highCVE-2026-64557: Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_new_connection_cb()msrc · 2026-08-06
mediumCVE-2024-58241: Bluetooth: hci_core: Disable works on hci_unregister_devmsrc · 2026-08-06