CVSS: 8.8EPSS: 0%CPEs: 15EXPL: 0CVE-2020-29569
https://notcve.org/view.php?id=CVE-2020-29569
An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. The Linux kernel PV block backend expects the kernel thread handler to reset ring->xenblkd to NULL when stopped. However, the handler may not have time to run if the frontend quickly toggles between the states connect and disconnect. As a consequence, the block backend may re-use a pointer after it was freed. A misbehaving guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend. • https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html https://security.gentoo.org/glsa/202107-30 https://security.netapp.com/advisory/ntap-20210205-0001 https://www.debian.org/security/2021/dsa-4843 https://xenbits.xenproject.org/xsa/advisory-350.html • CWE-416: Use After Free •
CVSS: 5.7EPSS: 0%CPEs: 11EXPL: 0CVE-2020-27825
https://notcve.org/view.php?id=CVE-2020-27825
A use-after-free flaw was found in kernel/trace/ring_buffer.c in Linux kernel (before 5.10-rc1). There was a race problem in trace_open and resize of cpu buffer running parallely on different cpus, may cause a denial of service problem (DOS). This flaw could even allow a local attacker with special user privilege to a kernel information leak threat. Se encontró un fallo de uso de la memoria previamente liberada en el archivo kernel/trace/ring_buffer.c en el kernel de Linux (anteriores a la versión 5.10-rc1). Se presentó un problema de carrera en trace_open y el cambio de tamaño del búfer de la CPU ejecutándose paralelamente en diferentes CPUs, puede causar un problema de Denegación de Servicio (DOS). • https://bugzilla.redhat.com/show_bug.cgi?id=1905155 https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html https://security.netapp.com/advisory/ntap-20210521-0008 https://www.debian.org/security/2021/dsa-4843 • CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') •
CVSS: 7.8EPSS: 0%CPEs: 14EXPL: 3CVE-2020-27786 – kernel: use-after-free in kernel midi subsystem
https://notcve.org/view.php?id=CVE-2020-27786
A flaw was found in the Linux kernel’s implementation of MIDI, where an attacker with a local account and the permissions to issue ioctl commands to midi devices could trigger a use-after-free issue. A write to this specific memory while freed and before use causes the flow of execution to change and possibly allow for memory corruption or privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability. Se encontró un fallo en la implementación de MIDI en el kernel de Linux, donde un atacante con una cuenta local y los permisos para emitir comandos ioctl a dispositivos midi podría desencadenar un problema de uso después de la liberación. Una escritura en esta memoria específica mientras está liberada y antes de su uso hace que el flujo de ejecución cambie y posiblemente permita la corrupción de memoria o la escalada de privilegios. • https://github.com/kiks7/CVE-2020-27786-Kernel-Exploit https://github.com/elbiazo/CVE-2020-27786 https://github.com/ii4gsp/CVE-2020-27786 http://www.openwall.com/lists/oss-security/2020/12/03/1 https://bugzilla.redhat.com/show_bug.cgi?id=1900933 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c1f6e3c818dd734c30f6a7eeebf232ba2cf3181d https://security.netapp.com/advisory/ntap-20210122-0002 https://access.redhat.com/security/cve/CVE-2020-27786 • CWE-416: Use After Free •
CVSS: 5.7EPSS: 0%CPEs: 12EXPL: 0CVE-2020-27350 – apt integer wraparound
https://notcve.org/view.php?id=CVE-2020-27350
APT had several integer overflows and underflows while parsing .deb packages, aka GHSL-2020-168 GHSL-2020-169, in files apt-pkg/contrib/extracttar.cc, apt-pkg/deb/debfile.cc, and apt-pkg/contrib/arfile.cc. This issue affects: apt 1.2.32ubuntu0 versions prior to 1.2.32ubuntu0.2; 1.6.12ubuntu0 versions prior to 1.6.12ubuntu0.2; 2.0.2ubuntu0 versions prior to 2.0.2ubuntu0.2; 2.1.10ubuntu0 versions prior to 2.1.10ubuntu0.1; APT tuvo varios desbordamientos y subdesbordamientos de enteros al analizar paquetes .deb, también se conocen como GHSL-2020-168 GHSL-2020-169, en los archivos apt-pkg/contrib/extracttar.cc, apt-pkg/deb/debfile.cc, and apt-pkg/contrib/arfile.cc. Este problema afecta: apt versiones 1.2.32ubuntu0 anteriores a 1.2.32ubuntu0.2; versiones 1.6.12ubuntu0 anteriores a 1.6.12ubuntu0.2; versiones 2.0.2ubuntu0 anteriores a 2.0.2ubuntu0.2; versiones 2.1.10ubuntu0 anteriores a 2.1.10ubuntu0.1; • https://bugs.launchpad.net/bugs/1899193 https://security.netapp.com/advisory/ntap-20210108-0005 https://usn.ubuntu.com/usn/usn-4667-1 https://www.debian.org/security/2020/dsa-4808 • CWE-190: Integer Overflow or Wraparound •
CVSS: 5.5EPSS: 0%CPEs: 5EXPL: 1CVE-2020-16599
https://notcve.org/view.php?id=CVE-2020-16599
A Null Pointer Dereference vulnerability exists in the Binary File Descriptor (BFD) library (aka libbfd), as distributed in GNU Binutils 2.35, in _bfd_elf_get_symbol_version_string, as demonstrated in nm-new, that can cause a denial of service via a crafted file. Se presenta una vulnerabilidad de Desreferencia del Puntero Null en la biblioteca Binary File Descriptor (BFD) (también se conoce como libbfd), como se distribuye en GNU Binutils versión 2.35, en _bfd_elf_get_symbol_version_string, como es demostrado en nm-new, que puede causar una denegación de servicio por medio de un archivo diseñado • https://security.netapp.com/advisory/ntap-20210122-0003 https://sourceware.org/bugzilla/show_bug.cgi?id=25842 https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git%3Bh=8d55d10ac0d112c586eaceb92e75bd9b80aadcc4 • CWE-476: NULL Pointer Dereference •