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An unprivileged local user could use this flaw to write to pages in the page cache backed by read only files and as such escalate their privileges on the system."}, {"lang": "es", "value": "Se ha encontrado un fallo en la forma en que el miembro \"flags\" de la estructura del nuevo b\u00fafer de la tuber\u00eda carec\u00eda de la inicializaci\u00f3n apropiada en las funciones copy_page_to_iter_pipe y push_pipe en el kernel de Linux y, por tanto, pod\u00eda contener valores obsoletos. 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{"acknowledgement": "Red Hat would like to thank Max Kellermann (CM4all) for reporting this issue.", "affected_release": [{"advisory": "RHSA-2022:0819", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-348.20.1.rt7.150.el8_5", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-03-10T00:00:00Z"}, {"advisory": "RHSA-2022:0825", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-348.20.1.el8_5", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-03-10T00:00:00Z"}, {"advisory": "RHSA-2022:0823", "cpe": "cpe:/o:redhat:rhel_e4s:8.1", "package": "kernel-0:4.18.0-147.64.1.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions", "release_date": "2022-03-10T00:00:00Z"}, {"advisory": "RHSA-2022:0821", "cpe": "cpe:/a:redhat:rhel_eus:8.2::nfv", "package": "kernel-rt-0:4.18.0-193.79.1.rt13.129.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2022-03-10T00:00:00Z"}, {"advisory": "RHSA-2022:0820", "cpe": "cpe:/o:redhat:rhel_eus:8.2", "package": "kernel-0:4.18.0-193.79.1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2022-03-10T00:00:00Z"}, {"advisory": "RHSA-2022:0822", "cpe": "cpe:/a:redhat:rhel_eus:8.4::nfv", "package": "kernel-rt-0:4.18.0-305.40.2.rt7.113.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Extended Update Support", "release_date": "2022-03-10T00:00:00Z"}, {"advisory": "RHSA-2022:0831", "cpe": "cpe:/o:redhat:rhel_eus:8.4", "package": "kernel-0:4.18.0-305.40.2.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Extended Update Support", "release_date": "2022-03-10T00:00:00Z"}, {"advisory": "RHSA-2022:0841", "cpe": "cpe:/o:redhat:rhev_hypervisor:4.4::el8", "package": "redhat-virtualization-host-0:4.4.10-202203101736_8.5", "product_name": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 8", "release_date": "2022-03-14T00:00:00Z"}], "bugzilla": {"description": "kernel: improper initialization of the \"flags\" member of the new pipe_buffer", "id": "2060795", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2060795"}, "csaw": true, "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-281->CWE-909", "details": ["A flaw was found in the way the \"flags\" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe and push_pipe functions in the Linux kernel and could thus contain stale values. An unprivileged local user could use this flaw to write to pages in the page cache backed by read only files and as such escalate their privileges on the system.", "A flaw was found in the way the \"flags\" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe and push_pipe functions in the Linux kernel and could thus contain stale values. An unprivileged local user could use this flaw to write to pages in the page cache backed by read only files and as such escalate their privileges on the system."], "mitigation": {"lang": "en:us", "value": "Currently there is no mitigation available for this flaw. Customers should update to fixed packages, once they are available."}, "name": "CVE-2022-0847", "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:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2022-03-07T12:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-0847\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-0847\nhttps://dirtypipe.cm4all.com/\nhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/lib/iov_iter.c?id=9d2231c5d74e13b2a0546fee6737ee4446017903\nhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog"], "statement": "Red Hat Product Security is aware of this issue. Updates will be released as they become available.\nNote that PIPE_BUF_FLAG_CAN_MERGE flag attack vector is not available in Red Hat Enterprise Linux 8 and thus the currently known exploits leveraging this flag do not work. The underlying issue (lack of proper pipe_buffer structure initialization) is still present though and other novel ways leading to successful exploitation cannot be fully ruled out.", "threat_severity": "Important", "upstream_fix": "kernel 5.17-rc6"}