CVE-2019-19602 Information

Description

fpregs_state_valid in arch/x86/include/asm/fpu/internal.h in the Linux kernel before 5.4.2 when GCC 9 is used allows context-dependent attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact because of incorrect fpu_fpregs_owner_ctx caching as demonstrated by mishandling of signal-based non-cooperative preemption in Go 1.14 prereleases on amd64 aka CID-59c4bd853abc.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L

Reference

https://bugzilla.kernel.org/show_bug.cgi?id=205663 https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.2 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=59c4bd853abcea95eccc167a7d7fd5f1a5f47b98 https://github.com/golang/go/issues/35777issuecomment-561935388 https://github.com/torvalds/linux/commit/59c4bd853abcea95eccc167a7d7fd5f1a5f47b98 https://security.netapp.com/advisory/ntap-20200103-0001/ https://usn.ubuntu.com/4284-1/

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

LOW

Base Severity

6.1