A flaw was found in the MCTP protocol in the Linux kernel. The function mctp_unregister() reclaims the device's relevant resource when a netcard detaches. However, a running routine may be unaware of this and cause the use-after-free of the mdev->addrs object, potentially leading to a denial of service.

References

• https://nvd.nist.gov/vuln/detail/CVE-2023-3439
• torvalds/linux@b561275
• https://bugzilla.redhat.com/show_bug.cgi?id=2217915
• http://www.openwall.com/lists/oss-security/2023/07/02/1