CVE-2024-36013 (GCVE-0-2024-36013)

Vulnerability from cvelistv5 – Published: 2024-05-23 07:03 – Updated: 2025-05-04 09:10
VLAI?
Title
Bluetooth: L2CAP: Fix slab-use-after-free in l2cap_connect()
Summary
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
Severity ?
6.8 (Medium)
CVSS:3.1/AV:A/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 73ffa904b78287f6acf8797e040150aa26a4af4a , < cfe560c7050bfb37b0d2491bbe7cd8b59e77fdc5 (git)
Affected: 73ffa904b78287f6acf8797e040150aa26a4af4a , < 826af9d2f69567c646ff46d10393d47e30ad23c6 (git)
Affected: 73ffa904b78287f6acf8797e040150aa26a4af4a , < 4d7b41c0e43995b0e992b9f8903109275744b658 (git)
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    Linux Linux Affected: 3.0
Unaffected: 0 , < 3.0 (semver)
Unaffected: 6.6.32 , ≤ 6.6.* (semver)
Unaffected: 6.8.11 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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