CVE-2026-98246

Kernel use-after-free via unlocked codec-list cleanup

Published Oct 6, 2026 · Updated Oct 6, 2026

Use-after-free in Linux kernel Bluetooth codec handling allows local users to read a freed codec entry during a BT_CODEC query. The hci_dev_close_sync() path clears hdev->local_codecs without holding hdev->lock, so sco_sock_getsockopt() can read an entry after cleanup frees it. The race requires controller closure to overlap a local codec query; a KASAN use-after-free read is documented, but further impact is not established.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux kernel Bluetooth codec handling allows local users to read a freed codec entry during a BT_CODEC query. The hci_dev_close_sync() path clears hdev->local_codecs without holding hdev->lock, so sco_sock_getsockopt() can read an entry after cleanup frees it. The race requires controller closure to overlap a local codec query; a KASAN use-after-free read is documented, but further impact is not established.

The record

CVE
CVE-2026-98246
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 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=6.1.57 <6.1.189
  2. Affected versionversion=626535077ba9dc110787540d1fe24881094c15a1 <9f407d52c0d881430d689836d3e7d32aa36f98b5
  3. Affected versionversion=6.5.7 <6.6
  4. Affected versionversion=6.6
  5. Affected versionversion=b938790e70540bf4f2e653dcd74b232494d06c8f <1276c2fafd18499769a28f96f45c5a76d6fc990e
  6. Affected versionversion=b938790e70540bf4f2e653dcd74b232494d06c8f <1ee0c5429dc4a92879bda2554b1bfd4abc6c587c
  7. Affected versionversion=b938790e70540bf4f2e653dcd74b232494d06c8f <4dc1ae5ff75b17e17ec4b74b11cc4b0099e71e00
  8. Affected versionversion=b938790e70540bf4f2e653dcd74b232494d06c8f <560ed4373c06a58123ecdf9ad5ecaddc87a73382
  9. Affected versionversion=b938790e70540bf4f2e653dcd74b232494d06c8f <9a10987a2f160a44a638c9a35994ca6e3089696e
  10. Affected versionversion=eea5a8f0c3b7c884d2351e75fbdd0a3d7def5ae1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.1.57 <6.1.189; version=626535077ba9dc110787540d1fe24881094c15a1 <9f407d52c0d881430d689836d3e7d32aa36f98b5; version=6.5.7 <6.6; version=6.6; version=b938790e70540bf4f2e653dcd74b232494d06c8f <1276c2fafd18499769a28f96f45c5a76d6fc990e; version=b938790e70540bf4f2e653dcd74b232494d06c8f <1ee0c5429dc4a92879bda2554b1bfd4abc6c587c; version=b938790e70540bf4f2e653dcd74b232494d06c8f <4dc1ae5ff75b17e17ec4b74b11cc4b0099e71e00; version=b938790e70540bf4f2e653dcd74b232494d06c8f <560ed4373c06a58123ecdf9ad5ecaddc87a73382; version=b938790e70540bf4f2e653dcd74b232494d06c8f <9a10987a2f160a44a638c9a35994ca6e3089696e; version=eea5a8f0c3b7c884d2351e75fbdd0a3d7def5ae1

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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