CVE-2021-47457

can: isotp: isotp_sendmsg(): add result check for wait_event_interruptible()

Description

In the Linux kernel, the following vulnerability has been resolved: can: isotp: isotp_sendmsg(): add result check for wait_event_interruptible() Using wait_event_interruptible() to wait for complete transmission, but do not check the result of wait_event_interruptible() which can be interrupted. It will result in TX buffer has multiple accessors and the later process interferes with the previous process. Following is one of the problems reported by syzbot. ============================================================= WARNING: CPU: 0 PID: 0 at net/can/isotp.c:840 isotp_tx_timer_handler+0x2e0/0x4c0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.13.0-rc7+ #68 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014 RIP: 0010:isotp_tx_timer_handler+0x2e0/0x4c0 Call Trace: <IRQ> ? isotp_setsockopt+0x390/0x390 __hrtimer_run_queues+0xb8/0x610 hrtimer_run_softirq+0x91/0xd0 ? rcu_read_lock_sched_held+0x4d/0x80 __do_softirq+0xe8/0x553 irq_exit_rcu+0xf8/0x100 sysvec_apic_timer_interrupt+0x9e/0xc0 </IRQ> asm_sysvec_apic_timer_interrupt+0x12/0x20 Add result check for wait_event_interruptible() in isotp_sendmsg() to avoid multiple accessers for tx buffer.

N/A
CVSS
Severity:
EPSS 0.08%
Affected: Linux Linux
Affected: Linux Linux
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/stable/c/053bc12df0d6097c1126d0e14fa778a0a8faeb64
https://git.kernel.org/stable/c/a76abedd2be3926d6deba236a935c7f98abf9110
https://git.kernel.org/stable/c/9acf636215a6ce9362fe618e7da4913b8bfe84c8

Frequently Asked Questions

What is the severity of CVE-2021-47457?
CVE-2021-47457 has not yet been assigned a CVSS score.
How to fix CVE-2021-47457?
To fix CVE-2021-47457, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-47457 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-47457 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-47457?
CVE-2021-47457 affects Linux Linux, Linux Linux.
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