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Review reviewHigh

CVE-2025-21969

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix slab-use-after-free Read in l2cap_send_cmd After the hci sync command releases l2cap_conn, the hci receive data work queue references the released l2cap_conn when sending to the upper layer. Add hci dev lock to the hci receive data work queue to synchronize the two. [1] BUG: KASAN: slab-use-after-free in l2cap_send_cmd+0x187/0x8d0 net/bluetooth/l2cap_core.c:954 Read of size 8 at addr ffff8880271a4000 by task kworker/u9:2/5837 CPU: 0 UID: 0 PID: 5837 Comm: kworker/u9:2 Not tainted 6.13.0-rc5-syzkaller-0...

CVSS
7.8
EPSS
0.22%
12.1% percentile
CISA KEV
Not listed
Published
2025.04.02
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.22%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix slab-use-after-free Read in l2cap_send_cmd After the hci sync command releases l2cap_conn, the hci receive data work queue references the released l2cap_conn when sending to the upper layer. Add hci dev lock to the hci receive data work queue to synchronize the two. [1] BUG: KASAN: slab-use-after-free in l2cap_send_cmd+0x187/0x8d0 net/bluetooth/l2cap_core.c:954 Read of size 8 at addr ffff8880271a4000 by task kworker/u9:2/5837 CPU: 0 UID: 0 PID: 5837 Comm: kworker/u9:2 Not tainted 6.13.0-rc5-syzkaller-0...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 9b3628d79b46f06157affc56fdb218fdd4988321 < c96cce853542b3b13da3738f35ef1be8cfcc9d1d, >= 9b3628d79b46f06157affc56fdb218fdd4988321 < f8094625a591eeb0b75b1bd9e713fac1d93f5ca9, >= 9b3628d79b46f06157affc56fdb218fdd4988321 < 7790a79c6fce8d5d552bc64f5c82819f719e4f28, >= 9b3628d79b46f06157affc56fdb218fdd4988321 < b4f82f9ed43aefa79bec2504ae8c29be0c0f5d1d, >= 995c917d6818b39308ac6baf3f6573cb0486a238, >= 5.17.14 < 5.18, >= 5.18, < 6.6.84, >= 6.7 < 6.12.20, >= 6.13 < 6.13.8, 6.14
Fixed versions
6.6.84, 6.12.20, 6.13.8

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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416
CVE-2025-21969 — Linux Linux, linux kernel | SECUFOCUS NOW