CVE-2022-49908

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: L2CAP: Fix memory leak in vhci_write

Syzkaller reports a memory leak as follows:

====================================

BUG: memory leak

unreferenced object 0xffff88810d81ac00 (size 240):

[...]

hex dump (first 32 bytes):

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

backtrace:

[<ffffffff838733d9>] __alloc_skb+0x1f9/0x270 net/core/skbuff.c:418

[<ffffffff833f742f>] alloc_skb include/linux/skbuff.h:1257 [inline]

[<ffffffff833f742f>] bt_skb_alloc include/net/bluetooth/bluetooth.h:469 [inline]

[<ffffffff833f742f>] vhci_get_user drivers/bluetooth/hci_vhci.c:391 [inline]

[<ffffffff833f742f>] vhci_write+0x5f/0x230 drivers/bluetooth/hci_vhci.c:511

[<ffffffff815e398d>] call_write_iter include/linux/fs.h:2192 [inline]

[<ffffffff815e398d>] new_sync_write fs/read_write.c:491 [inline]

[<fffff

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References