CVE-2026-64313

Bluetooth cryptographic compromise via dropped multiplication carry

Published Jul 25, 2026 · Updated Jul 25, 2026

Integer overflow in affected Linux Kernel releases allows physically proximate attackers to compromise Bluetooth LE cryptography. In crypto/ecc.c, add_128_128() fails to propagate a lower-word carry when the high word is saturated and equals the product's high word, producing an incorrect very-long-integer multiplication result. A nearby unauthenticated Bluetooth LE peer can supply public-key operands before pairing completes, enabling secret exposure, signature or peer-authentication bypass, and protected-function interruption.

CVSS severity8.8
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in affected Linux Kernel releases allows physically proximate attackers to compromise Bluetooth LE cryptography. In crypto/ecc.c, add_128_128() fails to propagate a lower-word carry when the high word is saturated and equals the product's high word, producing an incorrect very-long-integer multiplication result. A nearby unauthenticated Bluetooth LE peer can supply public-key operands before pairing completes, enabling secret exposure, signature or peer-authentication bypass, and protected-function interruption.

The record

CVE
CVE-2026-64313
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-190
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3c4b23901a0c766879dff680cd6bdab47bcdbbd2 <24a54dfa06d09813b4802a374fad3d2c0e16a884
  2. Affected versionversion=3c4b23901a0c766879dff680cd6bdab47bcdbbd2 <27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406
  3. Affected versionversion=3c4b23901a0c766879dff680cd6bdab47bcdbbd2 <5275e0fca256d081e2e7d4ba3dd8216c6e50d44e
  4. Affected versionversion=3c4b23901a0c766879dff680cd6bdab47bcdbbd2 <677450e5ef850c4d28b7956aa01104548c2a894e
  5. Affected versionversion=3c4b23901a0c766879dff680cd6bdab47bcdbbd2 <774ddddf5eb26eeca177350413e3e2bc50930ee9
  6. Affected versionversion=3c4b23901a0c766879dff680cd6bdab47bcdbbd2 <b709e0e768766abe29a49e1c1922a1604be602f4
  7. Affected versionversion=3c4b23901a0c766879dff680cd6bdab47bcdbbd2 <d11b2bb99bec1f5557c01cac42231e23745f49b8
  8. Affected versionversion=3c4b23901a0c766879dff680cd6bdab47bcdbbd2 <ebaae7c4251cc0cdb2602f334d4f08a3e82d271e
  9. Affected versionversion=4.8

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3c4b23901a0c766879dff680cd6bdab47bcdbbd2 <24a54dfa06d09813b4802a374fad3d2c0e16a884; version=3c4b23901a0c766879dff680cd6bdab47bcdbbd2 <27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406; version=3c4b23901a0c766879dff680cd6bdab47bcdbbd2 <5275e0fca256d081e2e7d4ba3dd8216c6e50d44e; version=3c4b23901a0c766879dff680cd6bdab47bcdbbd2 <677450e5ef850c4d28b7956aa01104548c2a894e; version=3c4b23901a0c766879dff680cd6bdab47bcdbbd2 <774ddddf5eb26eeca177350413e3e2bc50930ee9; version=3c4b23901a0c766879dff680cd6bdab47bcdbbd2 <b709e0e768766abe29a49e1c1922a1604be602f4; version=3c4b23901a0c766879dff680cd6bdab47bcdbbd2 <d11b2bb99bec1f5557c01cac42231e23745f49b8; version=3c4b23901a0c766879dff680cd6bdab47bcdbbd2 <ebaae7c4251cc0cdb2602f334d4f08a3e82d271e; version=4.8

Published CVSS scores

8.8LinuxCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
2.5Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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