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Review reviewHigh

CVE-2024-36013

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix slab-use-after-free in l2cap_connect() Extend a critical section to prevent chan from early freeing. Also make the l2cap_connect() return type void. Nothing is using the returned value but it is ugly to return a potentially freed pointer. Making it void will help with backports because earlier kernels did use the return value. Now the compile will break for kernels where this patch is not a complete fix. Call stack summary: [use] l2cap_bredr_sig_cmd l2cap_connect ┌ mutex_lock(&conn->chan_lock); │ chan...

CVSS
8.8
EPSS
0.47%
38.2% percentile
CISA KEV
Not listed
Published
2024.05.23
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.47%
Technical severityCVSS 8.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix slab-use-after-free in l2cap_connect() Extend a critical section to prevent chan from early freeing. Also make the l2cap_connect() return type void. Nothing is using the returned value but it is ugly to return a potentially freed pointer. Making it void will help with backports because earlier kernels did use the return value. Now the compile will break for kernels where this patch is not a complete fix. Call stack summary: [use] l2cap_bredr_sig_cmd l2cap_connect ┌ mutex_lock(&conn->chan_lock); │ chan...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 73ffa904b78287f6acf8797e040150aa26a4af4a < 8629a65a48890769c47ebc9b6e57c02a80a8975e, >= 73ffa904b78287f6acf8797e040150aa26a4af4a < cfe560c7050bfb37b0d2491bbe7cd8b59e77fdc5, >= 73ffa904b78287f6acf8797e040150aa26a4af4a < 826af9d2f69567c646ff46d10393d47e30ad23c6, >= 73ffa904b78287f6acf8797e040150aa26a4af4a < 4d7b41c0e43995b0e992b9f8903109275744b658, >= 3.0, >= 3.0 < 6.6.32, >= 6.7 < 6.8.11, 6.9
Fixed versions
6.6.32, 6.8.11

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel 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
CWE-416