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An issue was discovered in the Linux kernel through 4.17.11, as used in Xen through 4.11.x. The xen_failsafe_callback entry point in arch/x86/entry/entry_64.S does not properly maintain RBX, which allows local users to cause a denial of service (uninitialized memory usage and system crash). Within Xen, 64-bit x86 PV Linux guest OS users can trigger a guest OS crash or possibly gain privileges.
Metrics
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vector strings. CVSS information contributed by other sources is also
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OR
*cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
*cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
*cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
Changed
CPE Configuration
OR
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (including) 4.17.11
OR
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.14.21 up to (excluding) 4.14.61
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.15.5 up to (excluding) 4.17.13
Removed
CVSS V3
NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Added
CVSS V3.1
NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Changed
Reference Type
https://usn.ubuntu.com/3931-1/ No Types Assigned
https://usn.ubuntu.com/3931-1/ Third Party Advisory
Changed
Reference Type
https://usn.ubuntu.com/3931-2/ No Types Assigned
https://usn.ubuntu.com/3931-2/ Third Party Advisory