CVSS: 6.7EPSS: 0%CPEs: 4EXPL: 0CVE-2021-31916 – kernel: out of bounds array access in drivers/md/dm-ioctl.c
https://notcve.org/view.php?id=CVE-2021-31916
An out-of-bounds (OOB) memory write flaw was found in list_devices in drivers/md/dm-ioctl.c in the Multi-device driver module in the Linux kernel before 5.12. A bound check failure allows an attacker with special user (CAP_SYS_ADMIN) privilege to gain access to out-of-bounds memory leading to a system crash or a leak of internal kernel information. The highest threat from this vulnerability is to system availability. Se encontró un fallo de escritura de la memoria fuera de límites (OOB) en la función list_devices en el archivo drivers/md/dm-ioctl.c en el módulo de controlador Multi-device en el kernel de Linux versiones anteriores a 5.12. Un fallo de comprobación limitada permite a un atacante con privilegios de usuario especial (CAP_SYS_ADMIN) conseguir acceso a la memoria fuera de límites, conllevando a un bloqueo del sistema o una filtración de información interna del kernel. • https://bugzilla.redhat.com/show_bug.cgi?id=1946965 https://github.com/torvalds/linux/commit/4edbe1d7bcffcd6269f3b5eb63f710393ff2ec7a https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html https://seclists.org/oss-sec/2021/q1/268 https://access.redhat.com/security/cve/CVE-2021-31916 • CWE-787: Out-of-bounds Write •
CVSS: 6.2EPSS: 0%CPEs: 5EXPL: 0CVE-2021-31829 – kernel: protection of stack pointer against speculative pointer arithmetic can be bypassed to leak content of kernel memory
https://notcve.org/view.php?id=CVE-2021-31829
kernel/bpf/verifier.c in the Linux kernel through 5.12.1 performs undesirable speculative loads, leading to disclosure of stack content via side-channel attacks, aka CID-801c6058d14a. The specific concern is not protecting the BPF stack area against speculative loads. Also, the BPF stack can contain uninitialized data that might represent sensitive information previously operated on by the kernel. El archivo kernel/bpf/verifier.c en el kernel de Linux versiones hasta 5.12.1, lleva a cabo cargas especulativas no deseadas, conllevando a una divulgación del contenido de la pila por medio de ataques side-channel, también se conoce como CID-801c6058d14a. La preocupación específica no es proteger el área de la pila de BPF contra cargas especulativas. • http://www.openwall.com/lists/oss-security/2021/05/04/4 https://github.com/torvalds/linux/commit/801c6058d14a82179a7ee17a4b532cac6fad067f https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VWCZ6LJLENL2C3URW5ICARTACXPFCFN2 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y4X2G5YAPYJGI3PFEZZNOTRYI33GOCCZ https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor CWE-863: Incorrect Authorization •
CVSS: 7.8EPSS: 0%CPEs: 28EXPL: 0CVE-2021-3501 – kernel: userspace applications can misuse the KVM API to cause a write of 16 bytes at an offset up to 32 GB from vcpu->run
https://notcve.org/view.php?id=CVE-2021-3501
A flaw was found in the Linux kernel in versions before 5.12. The value of internal.ndata, in the KVM API, is mapped to an array index, which can be updated by a user process at anytime which could lead to an out-of-bounds write. The highest threat from this vulnerability is to data integrity and system availability. Se encontró un fallo en el kernel de Linux en versiones anteriores a 5.12. El valor de internal.ndata, en la API de KVM, es asignado a un índice de matriz, que puede ser actualizado por un proceso de usuario en cualquier momento, lo que podría conllevar a una escritura fuera de límites. • https://bugzilla.redhat.com/show_bug.cgi?id=1950136 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=04c4f2ee3f68c9a4bf1653d15f1a9a435ae33f7a https://security.netapp.com/advisory/ntap-20210618-0008 https://access.redhat.com/security/cve/CVE-2021-3501 • CWE-787: Out-of-bounds Write •
CVSS: 8.8EPSS: 0%CPEs: 20EXPL: 0CVE-2021-31440 – Linux Kernel eBPF Improper Input Validation Privilege Escalation Vulnerability
https://notcve.org/view.php?id=CVE-2021-31440
This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel 5.11.15. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the handling of eBPF programs. The issue results from the lack of proper validation of user-supplied eBPF programs prior to executing them. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel. • https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=10bf4e83167cc68595b85fd73bb91e8f2c086e36 https://security.netapp.com/advisory/ntap-20210706-0003 https://www.zerodayinitiative.com/advisories/ZDI-21-503 https://access.redhat.com/security/cve/CVE-2021-31440 https://bugzilla.redhat.com/show_bug.cgi?id=1964028 • CWE-682: Incorrect Calculation •
CVSS: 7.0EPSS: 0%CPEs: 30EXPL: 1CVE-2021-23133 – Linux Kernel sctp_destroy_sock race condition
https://notcve.org/view.php?id=CVE-2021-23133
A race condition in Linux kernel SCTP sockets (net/sctp/socket.c) before 5.12-rc8 can lead to kernel privilege escalation from the context of a network service or an unprivileged process. If sctp_destroy_sock is called without sock_net(sk)->sctp.addr_wq_lock then an element is removed from the auto_asconf_splist list without any proper locking. This can be exploited by an attacker with network service privileges to escalate to root or from the context of an unprivileged user directly if a BPF_CGROUP_INET_SOCK_CREATE is attached which denies creation of some SCTP socket. Una condición de carrera en los sockets SCTP del kernel de Linux (el archivo net/sctp/socket.c) versiones anteriores a 5.12-rc8, puede conllevar a una escalada de privilegios del kernel desde el contexto de un servicio de red o un proceso no privilegiado. Si la función sctp_destroy_sock es llamado sin sock_net (sk) -) sctp.addr_wq_lock, un elemento es eliminado de la lista auto_asconf_splist sin ningún bloqueo apropiado. • http://www.openwall.com/lists/oss-security/2021/05/10/1 http://www.openwall.com/lists/oss-security/2021/05/10/2 http://www.openwall.com/lists/oss-security/2021/05/10/3 http://www.openwall.com/lists/oss-security/2021/05/10/4 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b166a20b07382b8bc1dcee2a448715c9c2c81b5b https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html https://lists.debian.org/debian-lts-announce/2021/06/msg000 • CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') •