CVE-2021-47111

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Not taking the\nreference will lead to a use-after-free in that scenario. Such\nreference was taken before but dropped as part of the rework done in\n2ac061ce97f4.\n\nReintroduce the reference taking and add a comment this time\nexplaining why it's needed.\n\nThis is XSA-374 / CVE-2021-28691."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: xen-netback: toma una referencia al hilo de la tarea RX. Haga esto para evitar que la tarea se libere si el hilo regresa (que puede ser activado por el frontend) antes de que llamada a kthread_stop realizada como parte del desmontaje del backend. No tomar la referencia conducir\u00e1 a un use-after-free en ese escenario. Esta referencia se tom\u00f3 antes, pero se elimin\u00f3 como parte de la revisi\u00f3n realizada en 2ac061ce97f4. Vuelva a introducir la toma de referencia y agregue esta vez un comentario explicando por qu\u00e9 es necesario. 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{"bugzilla": {"description": "kernel: xen-netback: take a reference to the RX task thread", "id": "2269871", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2269871"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nxen-netback: take a reference to the RX task thread\nDo this in order to prevent the task from being freed if the thread\nreturns (which can be triggered by the frontend) before the call to\nkthread_stop done as part of the backend tear down. Not taking the\nreference will lead to a use-after-free in that scenario. Such\nreference was taken before but dropped as part of the rework done in\n2ac061ce97f4.\nReintroduce the reference taking and add a comment this time\nexplaining why it's needed.\nThis is XSA-374 / CVE-2021-28691."], "name": "CVE-2021-47111", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"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": "2024-03-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47111\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47111\nhttps://lore.kernel.org/linux-cve-announce/2024031506-CVE-2021-47111-4bd0@gregkh/T/#u"], "threat_severity": "Low"}

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