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CVE-2024-36013— Bluetooth: L2CAP: Fix slab-use-after-free in l2cap_connect()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于内存释放后重用。

CVSS 8.8 · High EPSS 0.48% · P40

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 73ffa904b78287f6acf8797e040150aa26a4af4a< 8629a65a48890769c47ebc9b6e57c02a80a8975e affected
73ffa904b78287f6acf8797e040150aa26a4af4a< cfe560c7050bfb37b0d2491bbe7cd8b59e77fdc5 affected
73ffa904b78287f6acf8797e040150aa26a4af4a< 826af9d2f69567c646ff46d10393d47e30ad23c6 affected
73ffa904b78287f6acf8797e040150aa26a4af4a< 4d7b41c0e43995b0e992b9f8903109275744b658 affected
3.0 affected
< 3.0 unaffected
6.1.178≤ 6.1.* unaffected
6.6.32≤ 6.6.* unaffected
… +2 more rows
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I. Basic Information for CVE-2024-36013

Vulnerability Information
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Vulnerability Title
Bluetooth: L2CAP: Fix slab-use-after-free in l2cap_connect()
Source: CVE Program / CVE List V5
Vulnerability Description
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 = pchan->ops->new_connection(pchan); <- alloc chan │ __l2cap_chan_add(conn, chan); │ l2cap_chan_hold(chan); │ list_add(&chan->list, &conn->chan_l); ... (1) └ mutex_unlock(&conn->chan_lock); chan->conf_state ... (4) <- use after free [free] l2cap_conn_del ┌ mutex_lock(&conn->chan_lock); │ foreach chan in conn->chan_l: ... (2) │ l2cap_chan_put(chan); │ l2cap_chan_destroy │ kfree(chan) ... (3) <- chan freed └ mutex_unlock(&conn->chan_lock); ================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: slab-use-after-free in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] BUG: KASAN: slab-use-after-free in l2cap_connect+0xa67/0x11a0 net/bluetooth/l2cap_core.c:4260 Read of size 8 at addr ffff88810bf040a0 by task kworker/u3:1/311
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于内存释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 73ffa904b78287f6acf8797e040150aa26a4af4a ~ 8629a65a48890769c47ebc9b6e57c02a80a8975e -
Linux Linux 3.0 -

II. Public POCs for CVE-2024-36013

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III. Intelligence Information for CVE-2024-36013

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Patches & Fixes for CVE-2024-36013 (1)

Mailing List Discussions for CVE-2024-36013 (2)

Other References for CVE-2024-36013 (2)

Same Patch Batch · Linux · 2024-05-23 · 3 CVEs total

CVE-2024-36012 7.8 HIGH Bluetooth: msft: fix slab-use-after-free in msft_do_close()
CVE-2024-36011 Bluetooth: HCI: Fix potential null-ptr-deref

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-36013

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