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CVE-2026-68479

HIGHCVSS 7.8/10EPSS 0.21%

Last modified

CVE-2026-68479 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.21%

11.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= db33c77dddc2ed2cff3061d0b096a9f5ab0c3647, < 39e01b4addfbbe177567d6ed1dfb81f9cccb19e6; >= db33c77dddc2ed2cff3061d0b096a9f5ab0c3647, < bda3c598ade6ea03884074b91e31608326684921; >= db33c77dddc2ed2cff3061d0b096a9f5ab0c3647, < a4cb830e0b55ac76c849fd7840afb251f4c028fa; >= db33c77dddc2ed2cff3061d0b096a9f5ab0c3647, < 68c5a2a19987c035eb129e627e579adafb04f637; >= db33c77dddc2ed2cff3061d0b096a9f5ab0c3647, < 83534891c058ed71e251135072640911670869aa; >= db33c77dddc2ed2cff3061d0b096a9f5ab0c3647, < 6744ab60dfac55d1df5733960aad5be300984301; >= db33c77dddc2ed2cff3061d0b096a9f5ab0c3647, < f1ca750c0510bdbb504bf084d2f196ef2af92ea6; >= db33c77dddc2ed2cff3061d0b096a9f5ab0c3647, < 609c5b04a28dc1b0f3af6a7bc93055135b2d2059
LinuxLinux4.2

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-68479?
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.
How severe is CVE-2026-68479?
CVE-2026-68479 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.
How do I fix CVE-2026-68479?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST