CVE-2019-15902

NameCVE-2019-15902
DescriptionA 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-1940-1, DSA-4531-1
NVD severitymedium (attack range: local)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)jessie3.16.56-1+deb8u1fixed
jessie (security)3.16.74-1fixed
stretch4.9.189-3vulnerable
stretch (security)4.9.189-3+deb9u1fixed
buster4.19.67-2vulnerable
buster (security)4.19.67-2+deb10u1fixed
bullseye, sid5.2.17-1vulnerable
linux-4.9 (PTS)jessie (security)4.9.189-3+deb9u1~deb8u1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)(unfixed)medium
linuxsourcebuster4.19.67-2+deb10u1mediumDSA-4531-1
linuxsourcejessie(not affected)
linuxsourcestretch4.9.189-3+deb9u1mediumDSA-4531-1
linux-4.9sourcejessie4.9.189-3+deb9u1~deb8u1mediumDLA-1940-1

Notes

[jessie] - linux <not-affected> (Bug never introduced)
https://grsecurity.net/teardown_of_a_failed_linux_lts_spectre_fix.php

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