What is CVE-2021-47457?

CVE-2021-47457 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 5.10 onward and patched in 5.10.76, 5.14.15 and 5.15. CVE-2021-47457 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47457?

CVE-2021-47457 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2021-47457?

Yes, CVE-2021-47457 has been patched. Fixed versions include 5.10.76, 5.14.15 and 5.15. If you are running Linux kernel 5.10 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47457 actively exploited?

CVE-2021-47457 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-47457

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 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.

Package Linux Kernel

Published 2024-05-22

Last modified 2025-09-29

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected versions

Linux kernel versions 5.10 and later are affected. Fixed in 5.10.76, 5.14.15, 5.15 and their respective stable series.

Affected from

≥ 5.10

Fixed in

✓ 5.10.76 5.10.x ✓ 5.14.15 5.14.x ✓ 5.15

References

3 total

Kernel Git
https://git.kernel.org/stable/c/053bc12df0d6097c1126d0e14fa778a0a8faeb64

Patch
Kernel Git
https://git.kernel.org/stable/c/9acf636215a6ce9362fe618e7da4913b8bfe84c8

Patch
Kernel Git
https://git.kernel.org/stable/c/a76abedd2be3926d6deba236a935c7f98abf9110

Patch

Details

CVE ID CVE-2021-47457

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-05-22

Modified 2025-09-29

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47457?

CVE-2021-47457 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 5.10 onward and has been patched in 5.10.76, 5.14.15 and 5.15. CVE-2021-47457 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47457?

CVE-2021-47457 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2021-47457?

Yes. CVE-2021-47457 has been patched. Fixed versions include 5.10.76, 5.14.15 and 5.15. If you are running Linux kernel 5.10 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47457 actively exploited?

No. CVE-2021-47457 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.