Description

A backporting error was discovered in the Linux stable/longterm kernel 4.4.x through 4.4.190, 4.9.x through 4.9.190, 4.14.x through 4.14.141, 4.19.x through 4.19.69, and 5.2.x through 5.2.11. Misuse of the upstream "x86/ptrace: Fix possible spectre-v1 in ptrace_get_debugreg()" commit reintroduced the Spectre vulnerability that it aimed to eliminate. This occurred because the backport process depends on cherry picking specific commits, and because two (correctly ordered) code lines were swapped.

References

http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00064.html

http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00066.html

https://grsecurity.net/teardown_of_a_failed_linux_lts_spectre_fix.php

https://lists.debian.org/debian-lts-announce/2019/10/msg00000.html

https://seclists.org/bugtraq/2019/Sep/41

https://security.netapp.com/advisory/ntap-20191004-0001/

https://usn.ubuntu.com/4157-1/

https://usn.ubuntu.com/4157-2/

https://usn.ubuntu.com/4162-1/

https://usn.ubuntu.com/4162-2/

https://usn.ubuntu.com/4163-1/

https://usn.ubuntu.com/4163-2/

https://www.debian.org/security/2019/dsa-4531

Details

Risk Information

CVSS v2

CVSS v3