{"schema_version":"1.9.0","id":"CVE-2023-3439","published":"2023-06-28T00:00:00Z","modified":"2026-08-12T03:51:18.221732814Z","details":"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.","affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/torvalds/linux","events":[{"introduced":"672c0c5173427e6b3e2a9bbb7be51ceeec78093a"},{"last_affected":"672c0c5173427e6b3e2a9bbb7be51ceeec78093a"}],"database_specific":{"extracted_events":[{"introduced":"Fixed in kernel 5.18-rc5"},{"last_affected":"Fixed in kernel 5.18-rc5"}],"source":"AFFECTED_FIELD"}}],"versions":["Fixed in kernel 5.18-rc5","v5.18-rc5"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-3439.json"}}],"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/3xxx/CVE-2023-3439.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-3439"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2217915"},{"type":"FIX","url":"https://github.com/torvalds/linux/commit/b561275d633bcd8e0e8055ab86f1a13df75a0269"},{"type":"ARTICLE","url":"http://www.openwall.com/lists/oss-security/2023/07/02/1"}],"database_specific":{"cna_assigner":"fedora","cwe_ids":["CWE-416"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/3xxx/CVE-2023-3439.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}