CVE-2026-31497

Local service interruption via btusb out-of-bounds read

Published Apr 22, 2026 · Updated Apr 22, 2026

An out-of-bounds read in the Linux Kernel btusb driver allows local users to interrupt service through Bluetooth SCO links. In btusb_work(), the driver subtracts one from hci_conn_num()'s active-link count and uses the result to index a three-entry alts[] table without capping the index. The path requires CVSD traffic with transparent voice settings and more than three active SCO links; the out-of-range kernel read affects availability without reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds read in the Linux Kernel btusb driver allows local users to interrupt service through Bluetooth SCO links. In btusb_work(), the driver subtracts one from hci_conn_num()'s active-link count and uses the result to index a three-entry alts[] table without capping the index. The path requires CVSD traffic with transparent voice settings and more than three active SCO links; the out-of-range kernel read affects availability without reported data disclosure or modification.

The record

CVE
CVE-2026-31497
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=5.8
  2. Affected versionversion=baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 <1019028eb124564cf7bca58a16f1df8a1ca30726
  3. Affected versionversion=baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 <129fa608b6ad08b8ab7178eeb2ec272c993aaccc
  4. Affected versionversion=baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 <21c254202f9d78abe0fcd642a92966deb92bd226
  5. Affected versionversion=baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 <312c4450fe23014665c163f480edd5ad2e27bbb8
  6. Affected versionversion=baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 <476c9262b430c38c6a701a3b8176a3f48689085b
  7. Affected versionversion=baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 <6fba3c3d48c927e55611a0f5ea34da88138ed0ff
  8. Affected versionversion=baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 <834cf890d2c3d29cbfa1ee2376c40469c28ec297
  9. Affected versionversion=baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 <9dd13a8641de79bc1bc93da55cdd35259a002683

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.8; version=baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 <1019028eb124564cf7bca58a16f1df8a1ca30726; version=baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 <129fa608b6ad08b8ab7178eeb2ec272c993aaccc; version=baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 <21c254202f9d78abe0fcd642a92966deb92bd226; version=baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 <312c4450fe23014665c163f480edd5ad2e27bbb8; version=baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 <476c9262b430c38c6a701a3b8176a3f48689085b; version=baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 <6fba3c3d48c927e55611a0f5ea34da88138ed0ff; version=baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 <834cf890d2c3d29cbfa1ee2376c40469c28ec297; version=baac6276c0a9f36f1fe1f00590ef00d2ba5ba626 <9dd13a8641de79bc1bc93da55cdd35259a002683

Published CVSS scores

5.5NIST NVDCVSS: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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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