CVE-2021-3655
https://notcve.org/view.php?id=CVE-2021-3655
A vulnerability was found in the Linux kernel in versions prior to v5.14-rc1. Missing size validations on inbound SCTP packets may allow the kernel to read uninitialized memory. Se ha detectado una vulnerabilidad en el kernel de Linux en versiones anteriores a v5.14-rc1.Una falta de comprobaciones de tamaño en los paquetes SCTP entrantes puede permitir al kernel leer la memoria no inicializada. • https://bugzilla.redhat.com/show_bug.cgi?id=1984024 https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html • CWE-20: Improper Input Validation CWE-909: Missing Initialization of Resource •
CVE-2021-3679 – kernel: DoS in rb_per_cpu_empty()
https://notcve.org/view.php?id=CVE-2021-3679
A lack of CPU resource in the Linux kernel tracing module functionality in versions prior to 5.14-rc3 was found in the way user uses trace ring buffer in a specific way. Only privileged local users (with CAP_SYS_ADMIN capability) could use this flaw to starve the resources causing denial of service. Se encontró una falta de recursos de CPU en la funcionalidad tracing module del kernel de Linux en versiones anteriores a 5.14-rc3 en la manera en que el usuario usa el búfer de anillo de rastreo de una manera específica. Sólo usuarios locales privilegiados (con capacidad CAP_SYS_ADMIN) podían usar este fallo para privar de recursos causando una denegación de servicio A lack of CPU resources in the Linux kernel tracing module functionality was found in the way users use the trace ring buffer in specific way. Only privileged local users (with CAP_SYS_ADMIN capability) could use this flaw to starve the resources causing denial of service. • https://bugzilla.redhat.com/show_bug.cgi?id=1989165 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=67f0d6d9883c13174669f88adac4f0ee656cc16a https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html https://www.debian.org/security/2021/dsa-4978 https://access.redhat.com/security/cve/CVE-2021-3679 • CWE-400: Uncontrolled Resource Consumption CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop') •
CVE-2021-34556
https://notcve.org/view.php?id=CVE-2021-34556
In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack because the protection mechanism neglects the possibility of uninitialized memory locations on the BPF stack. En el kernel de Linux versiones hasta 5.13.7, un programa BPF sin privilegios puede obtener información confidencial de la memoria del kernel por medio de un ataque de canal lateral Omisión de Almacenamiento Especulativo porque el mecanismo de protección no tiene en cuenta la posibilidad de ubicaciones de memoria no inicializadas en la pila BPF • http://www.openwall.com/lists/oss-security/2021/08/01/3 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/patch/?id=2039f26f3aca5b0e419b98f65dd36481337b86ee https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/patch/?id=f5e81d1117501546b7be050c5fbafa6efd2c722c https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/565ZS55ZFEN62WVRRORT7R63RXW5F4T4 https://lists.fedoraproject.org/a • CWE-203: Observable Discrepancy •
CVE-2021-35477
https://notcve.org/view.php?id=CVE-2021-35477
In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack because a certain preempting store operation does not necessarily occur before a store operation that has an attacker-controlled value. En el kernel de Linux versiones 5.13.7, un programa BPF sin privilegios puede obtener información confidencial de la memoria del kernel por medio de un ataque de canal lateral de Omisión de Almacenamiento Especulativo porque una determinada operación de almacenamiento anticipada no ocurre necesariamente antes de una operación de almacenamiento que tiene un valor controlado por el atacante • https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/patch/?id=2039f26f3aca5b0e419b98f65dd36481337b86ee https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/patch/?id=f5e81d1117501546b7be050c5fbafa6efd2c722c https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/565ZS55ZFEN62WVRRORT7R63RXW5F4T4 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6JKK6XNRZX5BT5QV • CWE-203: Observable Discrepancy •
CVE-2021-3573 – kernel: use-after-free in function hci_sock_bound_ioctl()
https://notcve.org/view.php?id=CVE-2021-3573
A use-after-free in function hci_sock_bound_ioctl() of the Linux kernel HCI subsystem was found in the way user calls ioct HCIUNBLOCKADDR or other way triggers race condition of the call hci_unregister_dev() together with one of the calls hci_sock_blacklist_add(), hci_sock_blacklist_del(), hci_get_conn_info(), hci_get_auth_info(). A privileged local user could use this flaw to crash the system or escalate their privileges on the system. This flaw affects the Linux kernel versions prior to 5.13-rc5. Se detectó un uso de la memoria previamente liberada en la función hci_sock_bound_ioctl() del subsistema HCI del kernel de Linux en la manera en que el usuario llama a ioct HCIUNBLOCKADDR o de otra manera desencadena una condición de carrera de la llamada hci_unregister_dev() junto con una de las llamadas hci_sock_blacklist_add(), hci_sock_blacklist_del(), hci_get_conn_info(), hci_get_auth_info(). Un usuario local privilegiado podría usar este fallo para bloquear el sistema o escalar sus privilegios en el sistema. • http://www.openwall.com/lists/oss-security/2023/07/02/1 https://bugzilla.redhat.com/show_bug.cgi?id=1966578 https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth.git/commit/?id=e305509e678b3a4af2b3cfd410f409f7cdaabb52 https://www.openwall.com/lists/oss-security/2021/06/08/2 https://access.redhat.com/security/cve/CVE-2021-3573 • CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') CWE-416: Use After Free •