Ubuntu Security Notice 3524-1 - Jann Horn discovered that microprocessors utilizing speculative execution and indirect branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Meltdown. A local attacker could use this to expose sensitive information, including kernel memory.
c8bb4a82294102baa9e7f69f64d2d2878ce4d9cc96d24be8c1049ae3616180f4Ubuntu Security Notice 3522-2 - USN-3522-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS. Jann Horn discovered that microprocessors utilizing speculative execution and indirect branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Meltdown. A local attacker could use this to expose sensitive information, including kernel memory. Various other issues were also addressed.
3e930e1f5dff43194405e5579a9823306e54589d76fe6adf09696898ed22a655Ubuntu Security Notice 3522-1 - Jann Horn discovered that microprocessors utilizing speculative execution and indirect branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Meltdown. A local attacker could use this to expose sensitive information, including kernel memory.
08ae6485c712ce5c920c54c20ceb6ff954aceba2445bce96579831fef548df84Ubuntu Security Notice 3523-1 - Jann Horn discovered that microprocessors utilizing speculative execution and indirect branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Meltdown. A local attacker could use this to expose sensitive information, including kernel memory. Jann Horn discovered that the Berkeley Packet Filter implementation in the Linux kernel did not properly check the relationship between pointer values and the BPF stack. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.
5e21912d20ede254be2f46410d61a48a034c988bdc1be837146967e4fe2ff191This is a note from the FreeBSD team that they were notified of the issue in late December and received a briefing under NDA with the original embargo date of January 9th. Since they received relatively late notice of the issue, their ability to provide fixes is delayed.
6ca4e042704f1c11c5f3b11989e130de889f46523779b326d9cbaf056da654caUbuntu Security Notice 3516-1 - It was discovered that speculative execution performed by modern CPUs could leak information through a timing side-channel attack, and that this could be exploited in web browser JavaScript engines. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this to obtain sensitive information from other domains, bypassing same-origin restrictions.
0ed258fac8391ebdb3640c895289db1d7c69d495280ee9f65578004df6a1089dDebian Linux Security Advisory 4078-1 - Multiple researchers have discovered a vulnerability in Intel processors, enabling an attacker controlling an unprivileged process to read memory from arbitrary addresses, including from the kernel and all other processes running on the system.
dba809dcfb07739de957d422e40b3b83ab100b0b0ab6c09e21819f31a77e56c2This is the very thorough blog write-up discussing three variants of side-channel attacks that can be leveraged against CPU data cache timing.
9107d6c0e85e587e6d3264885ffff091ea3bdc700da9a36dac144dc15d23913b
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