What’s Vulnerable › Vulnerabilities

CVE-2026-68479: Bluetooth: btrtl: validate firmware patch bounds

• Severity: high (CVSS 7.8 v3.1)
• 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: 2026-08-15 · updated 2026-10-19
• Weakness: CWE-190

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btrtl: validate firmware patch bounds rtlbt_parse_firmware() copies patch_length - 4 bytes before appending the firmware version. A malformed firmware patch shorter than the version field can make this subtraction underflow and turn the copy into an oversized read and write during Bluetooth setup. The existing patch_offset + patch_length check can also wrap on 32-bit architectures. Validate the patch length and range without arithmetic overflow before allocating or copying the patch.

Affected products

• Linux kernel: 4.2 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/39e01b4addfbbe177567d6ed1dfb81f9cccb19e6
• https://git.kernel.org/stable/c/609c5b04a28dc1b0f3af6a7bc93055135b2d2059
• https://git.kernel.org/stable/c/6744ab60dfac55d1df5733960aad5be300984301
• https://git.kernel.org/stable/c/68c5a2a19987c035eb129e627e579adafb04f637
• https://git.kernel.org/stable/c/83534891c058ed71e251135072640911670869aa
• https://git.kernel.org/stable/c/a4cb830e0b55ac76c849fd7840afb251f4c028fa
• https://git.kernel.org/stable/c/bda3c598ade6ea03884074b91e31608326684921
• https://git.kernel.org/stable/c/f1ca750c0510bdbb504bf084d2f196ef2af92ea6

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