CVE-2019-19602

Published: 5 December 2019

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.

From the Ubuntu security team

It was discovered that a race condition existed in the Linux kernel on x86 platforms when keeping track of which process was assigned control of the FPU. A local attacker could use this to cause a denial of service (memory corruption) or possibly gain administrative privileges.

Priority

Medium

CVSS 3 base score: 6.1

Status

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-19602
• https://git.kernel.org/linus/59c4bd853abcea95eccc167a7d7fd5f1a5f47b98
• 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/35777#issuecomment-561935388
• https://github.com/torvalds/linux/commit/59c4bd853abcea95eccc167a7d7fd5f1a5f47b98
• https://ubuntu.com/security/notices/USN-4284-1
• NVD
• Launchpad
• Debian