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This allows an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space"}, {"lang": "es", "value": "En el archivo net/netfilter/x_tables.c se ha detectado una escritura fuera de l\u00edmites en la pila que afecta a Linux desde la versi\u00f3n 2.6.19-rc1. Esto permite a un atacante alcanzar privilegios o causar una denegaci\u00f3n de servicio (por medio de corrupci\u00f3n de la memoria de la pila) mediante el espacio de nombres de usuario"}], "id": "CVE-2021-22555", "lastModified": "2025-10-27T17:06:32.497", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 4.6, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 3.9, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.3, "baseSeverity": "HIGH", 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"Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "cve-coordination@google.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2021:3328", "cpe": "cpe:/a:redhat:rhel_extras_rt:7", "package": "kernel-rt-0:3.10.0-1160.41.1.rt56.1181.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2021-08-31T00:00:00Z"}, {"advisory": "RHSA-2021:3327", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "kernel-0:3.10.0-1160.41.1.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2021-08-31T00:00:00Z"}, {"advisory": "RHSA-2021:3381", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "kpatch-patch", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2021-08-31T00:00:00Z"}, {"advisory": "RHSA-2021:3399", "cpe": "cpe:/o:redhat:rhel_aus:7.2", "package": "kernel-0:3.10.0-327.100.1.el7", "product_name": "Red Hat Enterprise Linux 7.2 Advanced Update Support", "release_date": "2021-08-31T00:00:00Z"}, {"advisory": "RHSA-2021:3321", "cpe": "cpe:/o:redhat:rhel_aus:7.3", "package": "kernel-0:3.10.0-514.92.1.el7", "product_name": "Red Hat Enterprise Linux 7.3 Advanced Update Support", "release_date": "2021-08-31T00:00:00Z"}, {"advisory": "RHSA-2021:3725", "cpe": "cpe:/o:redhat:rhel_aus:7.4", "package": "kernel-0:3.10.0-693.94.1.el7", "product_name": "Red Hat Enterprise Linux 7.4 Advanced Update Support", "release_date": "2021-10-05T00:00:00Z"}, {"advisory": "RHSA-2021:3812", "cpe": "cpe:/o:redhat:rhel_aus:7.6", "package": "kernel-0:3.10.0-957.84.1.el7", "product_name": "Red Hat Enterprise Linux 7.6 Advanced Update Support(Disable again in 2026 - SPRHEL-7118)", "release_date": "2021-10-12T00:00:00Z"}, {"advisory": "RHSA-2021:3812", "cpe": "cpe:/o:redhat:rhel_tus:7.6", "package": "kernel-0:3.10.0-957.84.1.el7", "product_name": "Red Hat Enterprise Linux 7.6 Telco Extended Update Support", "release_date": "2021-10-12T00:00:00Z"}, {"advisory": "RHSA-2021:3812", "cpe": "cpe:/o:redhat:rhel_e4s:7.6", "package": "kernel-0:3.10.0-957.84.1.el7", "product_name": "Red Hat Enterprise Linux 7.6 Update Services for SAP Solutions", "release_date": "2021-10-12T00:00:00Z"}, {"advisory": "RHSA-2021:3814", "cpe": "cpe:/o:redhat:rhel_e4s:7.6", "package": "kpatch-patch", "product_name": "Red Hat Enterprise Linux 7.6 Update Services for SAP Solutions", "release_date": "2021-10-12T00:00:00Z"}, {"advisory": "RHSA-2021:3522", "cpe": "cpe:/o:redhat:rhel_aus:7.7", "package": "kernel-0:3.10.0-1062.56.1.el7", "product_name": "Red Hat Enterprise Linux 7.7 Advanced Update Support", "release_date": "2021-09-14T00:00:00Z"}, {"advisory": "RHSA-2021:3522", "cpe": "cpe:/o:redhat:rhel_tus:7.7", "package": "kernel-0:3.10.0-1062.56.1.el7", "product_name": "Red Hat Enterprise Linux 7.7 Telco Extended Update Support", "release_date": "2021-09-14T00:00:00Z"}, {"advisory": "RHSA-2021:3522", "cpe": "cpe:/o:redhat:rhel_e4s:7.7", "package": "kernel-0:3.10.0-1062.56.1.el7", "product_name": "Red Hat Enterprise Linux 7.7 Update Services for SAP Solutions", "release_date": "2021-09-14T00:00:00Z"}, {"advisory": "RHSA-2021:3523", "cpe": "cpe:/o:redhat:rhel_e4s:7.7", "package": "kpatch-patch", "product_name": "Red Hat Enterprise Linux 7.7 Update Services for SAP Solutions", "release_date": "2021-09-14T00:00:00Z"}, {"advisory": "RHSA-2021:3088", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-305.12.1.rt7.84.el8_4", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-08-10T00:00:00Z"}, {"advisory": "RHSA-2021:3044", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kpatch-patch", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-08-10T00:00:00Z"}, {"advisory": "RHSA-2021:3057", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-305.12.1.el8_4", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-08-10T00:00:00Z"}, {"advisory": "RHSA-2021:3173", "cpe": "cpe:/o:redhat:rhel_eus:8.1", "package": "kernel-0:4.18.0-147.52.1.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2021-08-17T00:00:00Z"}, {"advisory": "RHSA-2021:3181", "cpe": "cpe:/o:redhat:rhel_eus:8.1", "package": "kpatch-patch", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2021-08-17T00:00:00Z"}, {"advisory": "RHSA-2021:3375", "cpe": "cpe:/a:redhat:rhel_eus:8.2::nfv", "package": "kernel-rt-0:4.18.0-193.64.1.rt13.115.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-08-31T00:00:00Z"}, {"advisory": "RHSA-2021:3363", "cpe": "cpe:/o:redhat:rhel_eus:8.2", "package": "kernel-0:4.18.0-193.64.1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-08-31T00:00:00Z"}, {"advisory": "RHSA-2021:3380", "cpe": "cpe:/o:redhat:rhel_eus:8.2", "package": "kpatch-patch", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-08-31T00:00:00Z"}, {"advisory": "RHSA-2021:3477", "cpe": "cpe:/o:redhat:enterprise_linux:7::hypervisor", "package": "redhat-virtualization-host-0:4.3.18-20210903.0.el7_9", "product_name": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 7", "release_date": "2021-09-09T00:00:00Z"}, {"advisory": "RHSA-2021:3235", "cpe": "cpe:/o:redhat:rhev_hypervisor:4.4::el8", "package": "redhat-virtualization-host-0:4.4.7-20210804.0.el8_4", "product_name": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 8", "release_date": "2021-08-19T00:00:00Z"}], "bugzilla": {"description": "kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c", "id": "1980101", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1980101"}, "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-787", "details": ["A heap out-of-bounds write affecting Linux since v2.6.19-rc1 was discovered in net/netfilter/x_tables.c. This allows an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space", "A flaw was discovered in processing setsockopt IPT_SO_SET_REPLACE (or IP6T_SO_SET_REPLACE) for 32 bit processes on 64 bit systems. This flaw will allow local user to gain privileges or cause a DoS through user name space. This action is usually restricted to root-privileged users but can also be leveraged if the kernel is compiled with CONFIG_USER_NS and CONFIG_NET_NS and the user is granted elevated privileges."], "mitigation": {"lang": "en:us", "value": "The mitigation for the Red Hat Enterprise Linux 8 is to disable for unprivileged user possibilities of running unshare(CLONE_NEWUSER) or unshare(CLONE_NEWNET) that could be done with the next command:\necho 0 > /proc/sys/user/max_user_namespaces\nFor making this change in configuration permanent.\nNote: User namespaces are used primarily for Linux containers. If containers are in use, this requirement is not applicable.\nConfigure RHEL 8 to disable the use of user namespaces by adding the following line to a file in the \"/etc/sysctl.d/\" directory:\nuser.max_user_namespaces = 0\nThe system configuration files need to be reloaded for the changes to take effect. To reload the contents of the files, run the following command:\n$ sudo sysctl --system\nThe other mitigation for containers, if without disabling user namespaces, is blocking the pertinent syscalls in a seccomp policy file. For more information about seccomp, please read: https://www.openshift.com/blog/seccomp-for-fun-and-profit"}, "name": "CVE-2021-22555", "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": "Affected", "package_name": "kernel-alt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2021-07-07T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-22555\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-22555\nhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d\nhttps://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528"], "statement": "For the Red Hat Enterprise Linux 7 only privileged user can trigger this bug.\nFor the Red Hat Enterprise Linux 8 regular user can trigger it, and the result is corruption of 4 bytes of memory.", "threat_severity": "Important"}

{}