• CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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 &#9484; mutex_lock(&conn->chan_lock); &#9474; chan = pchan->ops->new_connection(pchan); <- alloc chan &#9474; __l2cap_chan_add(conn, chan); &#9474; l2cap_chan_hold(chan); &#9474; list_add(&chan->list, &conn->chan_l); ... (1) &#9492; mutex_unlock(&conn->chan_lock); chan->conf_state ... (4) <- use after free [free] l2cap_conn_del &#9484; mutex_lock(&conn->chan_lock); &#9474; foreach chan in conn->chan_l: ... (2) &#9474; l2cap_chan_put(chan); &#9474; l2cap_chan_destroy &#9474; kfree(chan) ... (3) <- chan freed &#9492; 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
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Assigning CNA
Date Record Created
20240517 Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
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Assigned (20240517)
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