CVE-2018-18281
CVE-2018-18281
Since Linux kernel version 3.2, the mremap() syscall performs TLB flushes after dropping pagetable locks. If a syscall such as ftruncate() removes entries from the pagetables of a task that is in the middle of mremap(), a stale TLB entry can remain for a short time that permits access to a physical page after it has been released back to the page allocator and reused. This is fixed in the following kernel versions: 4.9.135, 4.14.78, 4.18.16, 4.19.
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Falar com a TrueHacking →Referências
http://packetstormsecurity.com/files/150001/Linux-mremap-TLB-Flush-Too-Late.htmlhttps://access.redhat.com/errata/RHSA-2019:0831https://access.redhat.com/errata/RHSA-2019:2029https://access.redhat.com/errata/RHSA-2019:2043https://access.redhat.com/errata/RHSA-2020:0036https://access.redhat.com/errata/RHSA-2020:0100https://access.redhat.com/errata/RHSA-2020:0103https://access.redhat.com/errata/RHSA-2020:0179https://bugs.chromium.org/p/project-zero/issues/detail?id=1695https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.78https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.16https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.135