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{"acknowledgement": "Red Hat would like to thank Jann Horn (Google Project Zero) for reporting this issue.", "affected_release": [{"advisory": "RHSA-2023:6901", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "impact": "moderate", "package": "kernel-rt-0:4.18.0-513.5.1.rt7.307.el8_9", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2023-11-14T00:00:00Z"}, {"advisory": "RHSA-2023:7077", "cpe": "cpe:/o:redhat:enterprise_linux:8", "impact": "moderate", "package": "kernel-0:4.18.0-513.5.1.el8_9", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2023-11-14T00:00:00Z"}, {"advisory": "RHSA-2024:1404", "cpe": "cpe:/o:redhat:rhel_eus:8.8", "package": "kernel-0:4.18.0-477.51.1.el8_8", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support", "release_date": "2024-03-19T00:00:00Z"}, {"advisory": "RHSA-2023:1470", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-162.22.2.el9_1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2023-03-27T00:00:00Z"}, {"advisory": "RHSA-2023:1469", "cpe": "cpe:/a:redhat:enterprise_linux:9::nfv", "package": "kernel-rt-0:5.14.0-162.22.2.rt21.186.el9_1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2023-03-27T00:00:00Z"}, {"advisory": "RHSA-2023:1470", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-162.22.2.el9_1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2023-03-27T00:00:00Z"}, {"advisory": "RHSA-2023:1471", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kpatch-patch", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2023-03-27T00:00:00Z"}, {"advisory": "RHSA-2023:1468", "cpe": "cpe:/a:redhat:rhel_eus:9.0", "package": "kernel-0:5.14.0-70.50.2.el9_0", "product_name": "Red Hat Enterprise Linux 9.0 Extended Update Support", "release_date": "2023-03-27T00:00:00Z"}, {"advisory": "RHSA-2023:1467", "cpe": "cpe:/a:redhat:rhel_eus:9.0::nfv", "package": "kernel-rt-0:5.14.0-70.50.2.rt21.122.el9_0", "product_name": "Red Hat Enterprise Linux 9.0 Extended Update Support", "release_date": "2023-03-27T00:00:00Z"}, {"advisory": "RHSA-2023:1466", "cpe": "cpe:/o:redhat:rhel_eus:9.0", "package": "kpatch-patch", "product_name": "Red Hat Enterprise Linux 9.0 Extended Update Support", "release_date": "2023-03-27T00:00:00Z"}], "bugzilla": {"description": "kernel: tun: avoid double free in tun_free_netdev", "id": "2156322", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2156322"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-415->CWE-824", "details": ["A double-free flaw was found in the Linux kernel\u2019s TUN/TAP device driver functionality in how a user registers the device when the register_netdevice function fails (NETDEV_REGISTER notifier). This flaw allows a local user to crash or potentially escalate their privileges on the system.", "A double-free flaw was found in the Linux kernel\u2019s TUN/TAP device driver functionality in how a user registers the device when the register_netdevice function fails (NETDEV_REGISTER notifier). This flaw allows a local user to crash or potentially escalate their privileges on the system."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, prevent the tun module from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically."}, "name": "CVE-2022-4744", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:rhev_hypervisor:4", "fix_state": "Affected", "impact": "moderate", "package_name": "redhat-virtualization-host", "product_name": "Red Hat Virtualization 4"}], "public_date": "2023-03-20T10:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-4744\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-4744\nhttps://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=158b515f703e"], "statement": "Keeping Red Hat Enterprise Linux version 8 with Moderate severity, because required patch 158b515f703e (see reference) missed. However, currently Red Hat Enterprise Linux version 8 not affected, because previous patch not backported too: 766b0515d5be (\"net: make sure devices go through netdev_wait_all_refs\"). Means that it is not possible to trigger the issue for the Red Hat Enterprise Linux 8, but potentially Red Hat Enterprise Linux version 8 could be vulnerable in future, so still need to fix. For the Red Hat Enterprise Linux version 9 there is known way to reproduce the issue.", "threat_severity": "Important", "upstream_fix": "kernel 5.16-rc7"}