ReviewHigh

CVE-2026-74530

Linux

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: hold conn in hci_connect_big_sync() callback There is theoretical UAF if the conn is freed while the hci_sync task is running. Hold refcount to avoid that. Handle NULL hcon, return 0 + do nothing to match the previous behavior.

CVSS
8.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.08.15
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 8.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: hold conn in hci_connect_big_sync() callback There is theoretical UAF if the conn is freed while the hci_sync task is running. Hold refcount to avoid that. Handle NULL hcon, return 0 + do nothing to match the previous behavior.

Affected product and versions

Product
Linux
Affected versions
>= 024421cf39923927ab2b5fe895d1d922b9abe67f < 2d91e6244b69d752503b2d44020d8b0e323dbd38, >= 024421cf39923927ab2b5fe895d1d922b9abe67f < 56e78b670356caab0b607e8aad4cf819a1909d07, >= 620810ac1f7f1133a9ac403e132b3ad6995ddf39, >= ee0586ad64a805eaf1a9a10100e908627a561e34, >= 6.12.28 < 6.13, >= 6.14.6 < 6.15, >= 6.15
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available