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.
References (7)
Core 7
Core References
Exploit, Vendor Advisory x_refsource_misc
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=59c4bd853abcea95eccc167a7d7fd5f1a5f47b98
Exploit, Third Party Advisory x_refsource_misc
https://github.com/torvalds/linux/commit/59c4bd853abcea95eccc167a7d7fd5f1a5f47b98
Release Notes, Vendor Advisory x_refsource_misc
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.2
Issue Tracking, Third Party Advisory x_refsource_misc
https://github.com/golang/go/issues/35777#issuecomment-561935388
Issue Tracking, Third Party Advisory x_refsource_misc
https://bugzilla.kernel.org/show_bug.cgi?id=205663
Third Party Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20200103-0001/
Third Party Advisory vendor-advisory
x_refsource_ubuntu
https://usn.ubuntu.com/4284-1/
Scores
CVSS v3
6.1
EPSS
0.0003
EPSS Percentile
10.1%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
Details
CWE
CWE-119
Status
published
Products (3)
canonical/ubuntu_linux
18.04
canonical/ubuntu_linux
19.10
linux/linux_kernel
< 5.4.2
Published
Dec 05, 2019
Tracked Since
Feb 18, 2026