PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-53358 Linux CVE debrief

A HIGH severity vulnerability was found in the Linux kernel Bluetooth L2CAP. The vulnerability has been resolved by using a channel timer to close channels in cleanup_listen(). This change ensures the correct lock order is maintained, preventing potential exploitation. Linux kernel users with Bluetooth L2CAP support should apply patches to mitigate this vulnerability. The patch modifies the Bluetooth L2CAP implementation to use a channel timer for closing channels, addressing the vulnerability.

Vendor
Linux
Product
Unknown
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-02
Original CVE updated
2026-07-18
Advisory published
2026-07-02
Advisory updated
2026-07-18

Who should care

Users of Linux kernel with Bluetooth L2CAP support should apply patches to mitigate this vulnerability. Linux kernel developers and maintainers should review and test patches. Security teams should inventory Linux kernel systems for potential exposure and monitor for suspicious Bluetooth activity.

Technical summary

The Linux kernel Bluetooth L2CAP has a vulnerability that can be exploited due to improper channel closure in cleanup_listen(). The fix involves scheduling l2cap_chan_timeout with a delay of 0 to close the channel asynchronously, ensuring the correct lock order is maintained. This change prevents potential attackers from exploiting the vulnerability. Linux kernel developers should review the patch and ensure proper integration. The patch modifies the Bluetooth L2CAP implementation to use a channel timer for closing channels, addressing the vulnerability.

Defensive priority

High priority should be given to patching Linux kernel systems with Bluetooth L2CAP support to prevent potential exploitation. Security teams should focus on verifying Linux kernel versions and Bluetooth L2CAP support for potential exposure.

Recommended defensive actions

  • Apply patches to Linux kernel systems with Bluetooth L2CAP support
  • Inventory Linux kernel systems for potential exposure
  • Monitor Linux kernel systems for suspicious Bluetooth activity
  • Review compensating controls for exposed systems
  • Check relevant monitoring, detection, and logs for exposed assets
  • Track exceptions and retest remediated assets
  • Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance

Evidence notes

The CVE record was published on 2026-07-02T15:17:03.283Z and last modified on 2026-07-18T08:16:36.493Z. The NVD entry is currently Awaiting Analysis. Evidence is limited to CVE and NVD details. Defenders should verify Linux kernel versions and Bluetooth L2CAP support for potential exposure. The vulnerability has been resolved in the Linux kernel, and users should apply patches to mitigate this vulnerability. Linux kernel developers and maintainers should review and test patches.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-02T15:17:03.283Z and has not been modified since then. The NVD entry is currently Awaiting Analysis.