-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 - ------------------------------------------------------------------------- Debian Security Advisory DSA-4699-1 security@debian.org https://www.debian.org/security/ Ben Hutchings June 09, 2020 https://www.debian.org/security/faq - ------------------------------------------------------------------------- Package : linux CVE ID : CVE-2019-3016 CVE-2019-19462 CVE-2020-0543 CVE-2020-10711 CVE-2020-10732 CVE-2020-10751 CVE-2020-10757 CVE-2020-12114 CVE-2020-12464 CVE-2020-12768 CVE-2020-12770 CVE-2020-13143 Debian Bug : 960271 Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks. CVE-2019-3016 It was discovered that the KVM implementation for x86 did not always perform TLB flushes when needed, if the paravirtualised TLB flush feature was enabled. This could lead to disclosure of sensitive information within a guest VM. CVE-2019-19462 The syzkaller tool found a missing error check in the 'relay' library used to implement various files under debugfs. A local user permitted to access debugfs could use this to cause a denial of service (crash) or possibly for privilege escalation. CVE-2020-0543 Researchers at VU Amsterdam discovered that on some Intel CPUs supporting the RDRAND and RDSEED instructions, part of a random value generated by these instructions may be used in a later speculative execution on any core of the same physical CPU. Depending on how these instructions are used by applications, a local user or VM guest could use this to obtain sensitive information such as cryptographic keys from other users or VMs. This vulnerability can be mitigated by a microcode update, either as part of system firmware (BIOS) or through the intel-microcode package in Debian's non-free archive section. This kernel update only provides reporting of the vulnerability and the option to disable the mitigation if it is not needed. CVE-2020-10711 Matthew Sheets reported NULL pointer dereference issues in the SELinux subsystem while receiving CIPSO packet with null category. A remote attacker can take advantage of this flaw to cause a denial of service (crash). Note that this issue does not affect the binary packages distributed in Debian as CONFIG_NETLABEL is not enabled. CVE-2020-10732 An information leak of kernel private memory to userspace was found in the kernel's implementation of core dumping userspace processes. CVE-2020-10751 Dmitry Vyukov reported that the SELinux subsystem did not properly handle validating multiple messages, which could allow a privileged attacker to bypass SELinux netlink restrictions. CVE-2020-10757 Fan Yang reported a flaw in the way mremap handled DAX hugepages, allowing a local user to escalate their privileges. CVE-2020-12114 Piotr Krysiuk discovered a race condition between the umount and pivot_root operations in the filesystem core (vfs). A local user with the CAP_SYS_ADMIN capability in any user namespace could use this to cause a denial of service (crash). CVE-2020-12464 Kyungtae Kim reported a race condition in the USB core that can result in a use-after-free. It is not clear how this can be exploited, but it could result in a denial of service (crash or memory corruption) or privilege escalation. CVE-2020-12768 A bug was discovered in the KVM implementation for AMD processors, which could result in a memory leak. The security impact of this is unclear. CVE-2020-12770 It was discovered that the sg (SCSI generic) driver did not correctly release internal resources in a particular error case. A local user permitted to access an sg device could possibly use this to cause a denial of service (resource exhaustion). CVE-2020-13143 Kyungtae Kim reported a potential heap out-of-bounds write in the USB gadget subsystem. A local user permitted to write to the gadget configuration filesystem could use this to cause a denial of service (crash or memory corruption) or potentially for privilege escalation. For the stable distribution (buster), these problems have been fixed in version 4.19.118-2+deb10u1. This version also fixes some related bugs that do not have their own CVE IDs, and a regression in the UAPI header introduced in the previous point release (bug #960271). We recommend that you upgrade your linux packages. For the detailed security status of linux please refer to its security tracker page at: https://security-tracker.debian.org/tracker/linux Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/ Mailing list: debian-security-announce@lists.debian.org -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEERkRAmAjBceBVMd3uBUy48xNDz0QFAl7f5cVfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldDQ2 NDQ0MDk4MDhDMTcxRTA1NTMxRERFRTA1NENCOEYzMTM0M0NGNDQACgkQBUy48xND z0Q2Gg//b/hL9fW9Js1PYDU/VtS6r5Cca5xsCYlbAheAlMPMtm/Vym4NJOuEvyuI DvPXbf0Bi7gjQ0gEgM/urJTzqjzIccwrUQe1aFHt0N9exC53z1xPWZDJepGkSQOB 2AB5YaFTxkuGur/HXbKomdMWvSVphpBM+id9v2V1iWY2iA6cI1sCjgziUKcDMECD T7tCe4Hrjf6BY/W4xBiT0BEQNOO2i/rn7p9pNk+wi85BbC7g5ubKWGn9sSDd8KtA u2z5tsicaM7kXaPsaW11fSPxu7YOz09qLgBQnY8B2gdMEAp3YjN9ibyHppjme3GK 02ZZUHQ+Y4MyQQgCzWxaqXCu6Aa+4B5i2nTY907BVBslrfulKRbr1qS3D2CJojT/ qYVub7C5RCW5VnbJZxCDLgSmGRbyPW2pVpnBTvID8czTUhd+M5e6fW932TzUW07w 18ueto1fRlcAauIO3SQV7Ai9froFGjH4L8XbUipiv0qwotSjcPb4HoZpp0xgNcRU xjZW0MMhK/lyfe8gDx8wjpihbQVKtTtIaWbeoZPoMENE92yW8+7DbXjfXAylX3px IdVaeo7iF3MOYuez4qEAsyPF4ver8Xl9HKS05J9NUYUeRf2BF3M6xFWjpTm5xjoH bdIGBJ322sNjTAzkneriX5iO3szBDINPHII2V/AaqafhYZYWtoM= =c00Y -----END PGP SIGNATURE-----