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CVE-2022-49248

Description

In the Linux kernel, the following vulnerability has been resolved:ALSA: firewire-lib: fix uninitialized flag for AV/C deferred transactionAV/C deferred transaction was supported at a commit 00a7bb81c20f ("ALSA:firewire-lib: Add support for deferred transaction") while 'deferrable'flag can be uninitialized for non-control/notify AV/C transactions.UBSAN reports it:kernel: ================================================================================kernel: UBSAN: invalid-load in /build/linux-aa0B4d/linux-5.15.0/sound/firewire/fcp.c:363:9kernel: load of value 158 is not a valid value for type '_Bool'kernel: CPU: 3 PID: 182227 Comm: irq/35-firewire Tainted: P OE 5.15.0-18-generic #18-Ubuntukernel: Hardware name: Gigabyte Technology Co., Ltd. AX370-Gaming 5/AX370-Gaming 5, BIOS F42b 08/01/2019kernel: Call Trace:kernel: kernel: show_stack+0x52/0x58kernel: dump_stack_lvl+0x4a/0x5fkernel: dump_stack+0x10/0x12kernel: ubsan_epilogue+0x9/0x45kernel: __ubsan_handle_load_invalid_value.cold+0x44/0x49kernel: fcp_response.part.0.cold+0x1a/0x2b [snd_firewire_lib]kernel: fcp_response+0x28/0x30 [snd_firewire_lib]kernel: fw_core_handle_request+0x230/0x3d0 [firewire_core]kernel: handle_ar_packet+0x1d9/0x200 [firewire_ohci]kernel: ? handle_ar_packet+0x1d9/0x200 [firewire_ohci]kernel: ? transmit_complete_callback+0x9f/0x120 [firewire_core]kernel: ar_context_tasklet+0xa8/0x2e0 [firewire_ohci]kernel: tasklet_action_common.constprop.0+0xea/0xf0kernel: tasklet_action+0x22/0x30kernel: __do_softirq+0xd9/0x2e3kernel: ? irq_finalize_oneshot.part.0+0xf0/0xf0kernel: do_softirq+0x75/0xa0kernel: kernel: kernel: __local_bh_enable_ip+0x50/0x60kernel: irq_forced_thread_fn+0x7e/0x90kernel: irq_thread+0xba/0x190kernel: ? irq_thread_fn+0x60/0x60kernel: kthread+0x11e/0x140kernel: ? irq_thread_check_affinity+0xf0/0xf0kernel: ? set_kthread_struct+0x50/0x50kernel: ret_from_fork+0x22/0x30kernel: kernel: ================================================================================This commit fixes the bug. The bug has no disadvantage for the non-control/notify AV/C transactions since the flag has an effect for AV/Cresponse with INTERIM (0x0f) status which is not used for the transactionsin AV/C general specification.

POC

Reference

- https://git.kernel.org/stable/c/eab74c41612083bd627b60da650e19234e4f1051

Github

No PoCs found on GitHub currently.