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CVE-2021-3640

HIGHCVSS 7/10EPSS 0.37%

Last modified

CVE-2021-3640 is a high-severity vulnerability rated 7/10 on the CVSS scale. A flaw use-after-free in function sco_sock_sendmsg() of the Linux kernel HCI subsystem was found in the way user calls ioct UFFDIO_REGISTER or other way triggers race condition of the call sco_conn_del() together with the call sco_sock_sendmsg() with the expected controllable faulting memory page. A privileged local user could use this flaw to crash the system or escalate their privileges on the system.. EPSS estimates a 0.37% chance of exploitation in the next 30 days.

Description

A flaw use-after-free in function sco_sock_sendmsg() of the Linux kernel HCI subsystem was found in the way user calls ioct UFFDIO_REGISTER or other way triggers race condition of the call sco_conn_del() together with the call sco_sock_sendmsg() with the expected controllable faulting memory page. A privileged local user could use this flaw to crash the system or escalate their privileges on the system.

Metrics

CVSS 3.1
7/10

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

EPSS Probability
0.37%

29.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
LinuxLinux Kernel< 4.4.293
LinuxLinux Kernel>= 4.5, < 4.9.291
LinuxLinux Kernel>= 4.10, < 4.14.256
LinuxLinux Kernel>= 4.15, < 4.19.218
LinuxLinux Kernel>= 4.20, < 5.4.160
LinuxLinux Kernel>= 5.5.0, < 5.10.80
LinuxLinux Kernel>= 5.11, < 5.14.19
LinuxLinux Kernel>= 5.15, < 5.15.3
DebianDebian Linux9.0
FedoraprojectFedora34
CanonicalUbuntu Linux14.04
CanonicalUbuntu Linux16.04
CanonicalUbuntu Linux18.04
CanonicalUbuntu Linux20.04
CanonicalUbuntu Linux21.10
NetappH300s FirmwareAll versions
NetappH700s FirmwareAll versions
NetappH300e FirmwareAll versions
NetappH500e FirmwareAll versions
NetappH700e FirmwareAll versions
NetappH410s FirmwareAll versions
NetappH410c FirmwareAll versions
NetappH500s FirmwareAll versions

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-3640?
A flaw use-after-free in function sco_sock_sendmsg() of the Linux kernel HCI subsystem was found in the way user calls ioct UFFDIO_REGISTER or other way triggers race condition of the call sco_conn_del() together with the call sco_sock_sendmsg() with the expected controllable faulting memory page. A privileged local user could use this flaw to crash the system or escalate their privileges on the system.
How severe is CVE-2021-3640?
CVE-2021-3640 has a CVSS score of 7/10 (HIGH severity). The EPSS model estimates a 0.37% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3640?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3640?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST