CVE-2024-26886

Adjacent service hang via Bluetooth socket deadlock

Published Apr 17, 2024 · Updated Jun 1, 2026

Deadlock in the Linux kernel Bluetooth socket layer allows remote attackers to hang affected systems through crafted L2CAP traffic. bt_sock_ioctl takes the socket lock while receive handling can enter l2cap_sock_recv_cb and attempt to acquire that lock again, blocking hci_rx_work. Reachability requires an enabled, reachable Bluetooth L2CAP path from an adjacent attacker, and the bounded consequence is a service hang rather than data disclosure or modification.

CVSS severity6.5
Medium
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deadlock in the Linux kernel Bluetooth socket layer allows remote attackers to hang affected systems through crafted L2CAP traffic. bt_sock_ioctl takes the socket lock while receive handling can enter l2cap_sock_recv_cb and attempt to acquire that lock again, blocking hci_rx_work. Reachability requires an enabled, reachable Bluetooth L2CAP path from an adjacent attacker, and the bounded consequence is a service hang rather than data disclosure or modification.

The record

CVE
CVE-2024-26886
Published
Apr 17, 2024
Updated
Jun 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 17, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 1, 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=1d576c3a5af850bf11fbd103f9ba11aa6d6061fb <64be3c6154886200708da0dfe259705fb992416c
  2. Affected versionversion=2b16d960c79abc397f102c3d23d30005b68cb036 <60673f442984fe689d4127a5dd4be414247b3d67
  3. Affected versionversion=2e07e8348ea454615e268222ae3fc240421be768 <2c9e2df022ef8b9d7fac58a04a2ef4ed25288955
  4. Affected versionversion=2e07e8348ea454615e268222ae3fc240421be768 <817e8138ce86001b2fa5c63d6ede756e205a01f7
  5. Affected versionversion=2e07e8348ea454615e268222ae3fc240421be768 <f7b94bdc1ec107c92262716b073b3e816d4784fb
  6. Affected versionversion=37f71e2c9f515834841826f4eb68ec33cfb2a1ff
  7. Affected versionversion=5.10.206 <5.11
  8. Affected versionversion=5.15.146 <5.15.209
  9. Affected versionversion=6.1.70 <6.2
  10. Affected versionversion=6.6.9 <6.6.23
  11. Affected versionversion=6.7
  12. Affected versionversion=db1b14eec8c61a20374de9f9c2ddc6c9406a8c42

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1d576c3a5af850bf11fbd103f9ba11aa6d6061fb <64be3c6154886200708da0dfe259705fb992416c; version=2b16d960c79abc397f102c3d23d30005b68cb036 <60673f442984fe689d4127a5dd4be414247b3d67; version=2e07e8348ea454615e268222ae3fc240421be768 <2c9e2df022ef8b9d7fac58a04a2ef4ed25288955; version=2e07e8348ea454615e268222ae3fc240421be768 <817e8138ce86001b2fa5c63d6ede756e205a01f7; version=2e07e8348ea454615e268222ae3fc240421be768 <f7b94bdc1ec107c92262716b073b3e816d4784fb; version=37f71e2c9f515834841826f4eb68ec33cfb2a1ff; version=5.10.206 <5.11; version=5.15.146 <5.15.209; version=6.1.70 <6.2; version=6.6.9 <6.6.23; version=6.7; version=db1b14eec8c61a20374de9f9c2ddc6c9406a8c42

Published CVSS scores

6.5CISA ADP VulnrichmentCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/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

CWE-416Use After Free
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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