CVE-2026-63975

Kernel crash via L2CAP channel iterator invalidation

Published Jul 19, 2026 · Updated Jul 19, 2026

Use-after-free in the Linux kernel Bluetooth L2CAP handler allows physically proximate attackers to crash the system via crafted BLE traffic. In l2cap_ecred_conn_rsp, deleting a channel whose destination CID is already assigned invalidates the saved list iterator and later dereferences freed channel memory. An attacker needs an established BLE ACL link and reuses a chosen destination CID in a crafted L2CAP ECRED connection response; the result is kernel corruption, an oops, or a panic.

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

Use-after-free in the Linux kernel Bluetooth L2CAP handler allows physically proximate attackers to crash the system via crafted BLE traffic. In l2cap_ecred_conn_rsp, deleting a channel whose destination CID is already assigned invalidates the saved list iterator and later dereferences freed channel memory. An attacker needs an established BLE ACL link and reuses a chosen destination CID in a crafted L2CAP ECRED connection response; the result is kernel corruption, an oops, or a panic.

The record

CVE
CVE-2026-63975
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=15f02b91056253e8cdc592888f431da0731337b8 <291eec1041c918c460dc9702e44edd17794b4a4b
  2. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <3c8eaa91eb433c450426539290be4ffe282e9f00
  3. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <41c2713b204e6cb6a94587bc6bf6935107df5479
  4. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <41e29548b5e8b5e5fcf708786b3bea67cab107fa
  5. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <6319b38fe69f56ed95680ade485b957a53fff642
  6. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <d153b8898c0051eb8b6a083b35cbe304a5886bd5
  7. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <e6833e737a51db1e5ea0401322acf5e22abd8be6
  8. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <ecfed1e0d8efecad6737a0d83e21d2fd021d8c48
  9. Affected versionversion=5.7

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=15f02b91056253e8cdc592888f431da0731337b8 <291eec1041c918c460dc9702e44edd17794b4a4b; version=15f02b91056253e8cdc592888f431da0731337b8 <3c8eaa91eb433c450426539290be4ffe282e9f00; version=15f02b91056253e8cdc592888f431da0731337b8 <41c2713b204e6cb6a94587bc6bf6935107df5479; version=15f02b91056253e8cdc592888f431da0731337b8 <41e29548b5e8b5e5fcf708786b3bea67cab107fa; version=15f02b91056253e8cdc592888f431da0731337b8 <6319b38fe69f56ed95680ade485b957a53fff642; version=15f02b91056253e8cdc592888f431da0731337b8 <d153b8898c0051eb8b6a083b35cbe304a5886bd5; version=15f02b91056253e8cdc592888f431da0731337b8 <e6833e737a51db1e5ea0401322acf5e22abd8be6; version=15f02b91056253e8cdc592888f431da0731337b8 <ecfed1e0d8efecad6737a0d83e21d2fd021d8c48; version=5.7

Published CVSS scores

8.8Linux kernel.orgCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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

T1499Endpoint Denial of Service

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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