What’s Vulnerable › Vulnerabilities

CVE-2026-98247: Bluetooth: hci_codec: validate vendor codec count length

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-06 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_codec: validate vendor codec count length The Read Local Supported Codecs parsers consume the variable-sized standard codec array before parsing the vendor codec count. Although the initial reply-size check includes a vendor count byte in the fixed layout, it does not guarantee that the byte remains after the standard codec array. If a controller reply ends immediately after that array, calculating the vendor codec array size reads vnd_codecs->num beyond the skb data. Use skb_pull_data() to validate and consume each codec header before using its count in both command variants.

Affected products

• Linux kernel: 5.16 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/12a82819b0cada6e304790b1097f8f9006eb6123
• https://git.kernel.org/stable/c/9c04b9a4d08b95dee901d24b7607c4cbd65fa0a8
• https://git.kernel.org/stable/c/a6da782fefae611e68a1aa79644065fc8ca5abcd
• https://git.kernel.org/stable/c/d0795cfd6f655f4de84868a4f4bb41a03f037b3d
• https://git.kernel.org/stable/c/e4cfd3c4299105237458b27958bd7b0aa4c60795
• https://git.kernel.org/stable/c/f49a543d76d48f184b34225d9c0e2fc4cbdea8ec

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