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Thu May 16 07:49:35 2019 UTC (4 months ago) by tmb
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MGASA-2019-0174: kernel-4.14.119-1.mga6, kernel-userspace-headers-4.14.119-1.mga6, kmod-vboxadditions-6.0.6-3.mga6, kmod-virtualbox-6.0.6-3.mga6, kmod-xtables-addons-2.13-85.mga6
1 tmb 8540 type: security
2     subject: Updated kernel packages fix security vulnerability
3     CVE:
4     - CVE-2018-12126
5     - CVE-2018-12127
6     - CVE-2018-12130
7     - CVE-2019-11091
8     src:
9     6:
10     core:
11     - kernel-4.14.119-1.mga6
12     - kernel-userspace-headers-4.14.119-1.mga6
13     - kmod-vboxadditions-6.0.6-3.mga6
14     - kmod-virtualbox-6.0.6-3.mga6
15     - kmod-xtables-addons-2.13-85.mga6
16     description: |
17     This kernel update provides the upstream 4.14.119 that adds the kernel side
18     mitigations for the Microarchitectural Data Sampling (MDS, also called
19     ZombieLoad attack) vulnerabilities in Intel processors that can allow
20     attackers to retrieve data being processed inside a CPU. To complete the
21     mitigations new microcode is also needed, either by installing the
22     microcode-0.20190514-1.mga6 package, or get an updated bios / uefi
23     firmware from the motherboard vendor.
24    
25     The fixed / mitigated issues are:
26    
27     Modern Intel microprocessors implement hardware-level micro-optimizations
28     to improve the performance of writing data back to CPU caches. The write
29     operation is split into STA (STore Address) and STD (STore Data)
30     sub-operations. These sub-operations allow the processor to hand-off
31     address generation logic into these sub-operations for optimized writes.
32     Both of these sub-operations write to a shared distributed processor
33     structure called the 'processor store buffer'. As a result, an
34     unprivileged attacker could use this flaw to read private data resident
35     within the CPU's processor store buffer. (CVE-2018-12126)
36    
37     Microprocessors use a ‘load port’ subcomponent to perform load operations
38     from memory or IO. During a load operation, the load port receives data
39     from the memory or IO subsystem and then provides the data to the CPU
40     registers and operations in the CPU’s pipelines. Stale load operations
41     results are stored in the 'load port' table until overwritten by newer
42     operations. Certain load-port operations triggered by an attacker can be
43     used to reveal data about previous stale requests leaking data back to the
44     attacker via a timing side-channel. (CVE-2018-12127)
45    
46     A flaw was found in the implementation of the "fill buffer", a mechanism
47     used by modern CPUs when a cache-miss is made on L1 CPU cache. If an
48     attacker can generate a load operation that would create a page fault,
49     the execution will continue speculatively with incorrect data from the
50     fill buffer while the data is fetched from higher level caches. This
51     response time can be measured to infer data in the fill buffer.
52     (CVE-2018-12130)
53    
54     Uncacheable memory on some microprocessors utilizing speculative execution
55     may allow an authenticated user to potentially enable information disclosure
56     via a side channel with local access. (CVE-2019-11091)
57     references:
58     - https://bugs.mageia.org/show_bug.cgi?id=24820
59     - https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html
60     - https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.117
61     - https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.118
62     - https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.119
63 tmb 8547 ID: MGASA-2019-0174

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