CVSS: 5.5EPSS: 0%CPEs: 5EXPL: 1CVE-2021-29155 – kernel: protection for sequences of pointer arithmetic operations against speculatively out-of-bounds loads can be bypassed to leak content of kernel memory
https://notcve.org/view.php?id=CVE-2021-29155
An issue was discovered in the Linux kernel through 5.11.x. kernel/bpf/verifier.c performs undesirable out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory. Specifically, for sequences of pointer arithmetic operations, the pointer modification performed by the first operation is not correctly accounted for when restricting subsequent operations. Se detectó un problema en el kernel de Linux versiones hasta 5.11.x. En el archivo kernel/bpf/verifier.c lleva a cabo especulaciones indeseables fuera de límites en la aritmética de punteros, conllevando a ataques de canal lateral que anulan las mitigaciones de Spectre y consiguen información confidencial de la memoria del kernel. Específicamente, para secuencias de operaciones aritméticas de puntero, la modificación de puntero llevada a cabo por la primera operación no se contabiliza correctamente al restringir operaciones posteriores A vulnerability was discovered in retrieve_ptr_limit in kernel/bpf/verifier.c in the Linux kernel mechanism to mitigate speculatively out-of-bounds loads (Spectre mitigation). • https://github.com/benschlueter/CVE-2021-29155 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=073815b756c51ba9d8384d924c5d1c03ca3d1ae4 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=24c109bb1537c12c02aeed2d51a347b4d6a9b76e https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6f55b2f2a1178856c19bbce2f71449926e731914 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7fedb63a8307dda0ec3b8969a3b233a1dd7ea8e0 https://git.kernel& • CWE-125: Out-of-bounds Read •
CVSS: 7.1EPSS: 0%CPEs: 24EXPL: 0CVE-2021-3506
https://notcve.org/view.php?id=CVE-2021-3506
An out-of-bounds (OOB) memory access flaw was found in fs/f2fs/node.c in the f2fs module in the Linux kernel in versions before 5.12.0-rc4. A bounds check failure allows a local attacker 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 acceso a la memoria fuera de límites (OOB) en el archivo fs/f2fs/node.c en el módulo f2fs en el kernel de Linux en versiones anteriores a 5.12.0-rc4. Un fallo en la comprobación de límites permite a un atacante local conseguir acceso a la memoria fuera de límites, conllevando a un bloqueo del sistema o una fuga de información interna del kernel. • http://www.openwall.com/lists/oss-security/2021/05/08/1 https://bugzilla.redhat.com/show_bug.cgi?id=1944298 https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html https://security.netapp.com/advisory/ntap-20210611-0007 https://www.mail-archive.com/linux-kernel%40vger.kernel.org/msg2520013.html https://www.openwall.com/lists/oss-security/2021/03/28/2 • CWE-125: Out-of-bounds Read •
CVSS: 7.8EPSS: 0%CPEs: 26EXPL: 0CVE-2021-29154 – kernel: Local privilege escalation due to incorrect BPF JIT branch displacement computation
https://notcve.org/view.php?id=CVE-2021-29154
BPF JIT compilers in the Linux kernel through 5.11.12 have incorrect computation of branch displacements, allowing them to execute arbitrary code within the kernel context. This affects arch/x86/net/bpf_jit_comp.c and arch/x86/net/bpf_jit_comp32.c. Los compiladores BPF JIT en el kernel de Linux hasta la versión 5.11.12 tienen un cálculo incorrecto de los desplazamientos de rama, lo que les permite ejecutar código arbitrario dentro del contexto del kernel. Esto afecta a arch/x86/net/bpf_jit_comp.c y arch/x86/net/bpf_jit_comp32.c A flaw was found in the Linux kernels eBPF implementation. By default, accessing the eBPF verifier is only accessible to privileged users with CAP_SYS_ADMIN. • http://packetstormsecurity.com/files/162434/Kernel-Live-Patch-Security-Notice-LSN-0076-1.html https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=26f55a59dc65ff77cd1c4b37991e26497fc68049 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e4d4d456436bfb2fe412ee2cd489f7658449b098 https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html https://lists.fedoraproject.org/archives/list/package-anno • CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer •
CVSS: 5.5EPSS: 0%CPEs: 4EXPL: 0CVE-2021-30178
https://notcve.org/view.php?id=CVE-2021-30178
An issue was discovered in the Linux kernel through 5.11.11. synic_get in arch/x86/kvm/hyperv.c has a NULL pointer dereference for certain accesses to the SynIC Hyper-V context, aka CID-919f4ebc5987. Se detectó un problema en el kernel de Linux versiones hasta 5.11.11. La función synic_get en el archivo arch/x86/kvm/hyperv.c presenta una desreferencia de puntero NULL para determinados accesos en el contexto SynIC Hyper-V, también se conoce como CID-919f4ebc5987 • https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=919f4ebc598701670e80e31573a58f1f2d2bf918 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IJ5GEETMX3ERQ4DF3GSS2XPNSOOK44OB https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TGQDVYCDM3F5VXUZIADIV2ERL3AJXNJS https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W5YFGIIF24475A2LNW3UWHW2SNCS3G7M • CWE-476: NULL Pointer Dereference •
CVSS: 6.2EPSS: 0%CPEs: 2EXPL: 0CVE-2021-30002 – kernel: memory leak for large arguments in video_usercopy function in drivers/media/v4l2-core/v4l2-ioctl.c
https://notcve.org/view.php?id=CVE-2021-30002
An issue was discovered in the Linux kernel before 5.11.3 when a webcam device exists. video_usercopy in drivers/media/v4l2-core/v4l2-ioctl.c has a memory leak for large arguments, aka CID-fb18802a338b. Se detectó un problema en el kernel de Linux versiones anteriores a 5.11.3, cuando se presenta un dispositivo webcam. video_usercopy en el archivo drivers/media/v4l2-core/v4l2-ioctl.c, presenta una pérdida de memoria para argumentos grandes, también se conoce como CID-fb18802a338b. A flaw memory leak in the Linux kernel webcam device functionality was found in the way user calls ioctl that triggers video_usercopy function. The highest threat from this vulnerability is to system availability. • https://bugzilla.suse.com/show_bug.cgi?id=1184120 https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.3 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fb18802a338b36f675a388fc03d2aa504a0d0899 https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html https://access.redhat.com/security/cve/CVE-2021-30002 https://bugzilla.redhat.com/show_bug.cgi?id=1946279 • CWE-401: Missing Release of Memory after Effective Lifetime CWE-772: Missing Release of Resource after Effective Lifetime •