Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.10, < 5.10.76 |
References
- https://git.kernel.org/stable/c/053bc12df0d6097c1126d0e14fa778a0a8faeb64Patch
- https://git.kernel.org/stable/c/9acf636215a6ce9362fe618e7da4913b8bfe84c8Patch
- https://git.kernel.org/stable/c/a76abedd2be3926d6deba236a935c7f98abf9110Patch
- https://git.kernel.org/stable/c/053bc12df0d6097c1126d0e14fa778a0a8faeb64Patch
- https://git.kernel.org/stable/c/9acf636215a6ce9362fe618e7da4913b8bfe84c8Patch
- https://git.kernel.org/stable/c/a76abedd2be3926d6deba236a935c7f98abf9110Patch
FAQ
What is CVE-2021-47457?
CVE-2021-47457 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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...
How severe is CVE-2021-47457?
CVE-2021-47457 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47457?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.