CVE-2019-15902

MEDIUM

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

Source: MITRE

Published: 2019-09-04

Updated: 2019-10-17

Type: CWE-200

Risk Information

CVSS v2.0

Base Score: 4.7

Vector: AV:L/AC:M/Au:N/C:C/I:N/A:N

Impact Score: 6.9

Exploitability Score: 3.4

Severity: MEDIUM

CVSS v3.0

Base Score: 5.6

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

Impact Score: 4

Exploitability Score: 1.1

Severity: MEDIUM