| Name | CVE-2017-7518 |
| Description | A flaw was found in the Linux kernel before version 4.12 in the way the KVM module processed the trap flag(TF) bit in EFLAGS during emulation of the syscall instruction, which leads to a debug exception(#DB) being raised in the guest stack. A user/process inside a guest could use this flaw to potentially escalate their privileges inside the guest. Linux guests are not affected by this. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-3981-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| linux (PTS) | jessie, jessie (lts) | 3.16.84-1 | fixed |
| stretch (security) | 4.9.320-2 | fixed |
| stretch (lts), stretch | 4.9.320-3 | fixed |
| buster (security), buster, buster (lts) | 4.19.316-1 | fixed |
| bullseye | 5.10.223-1 | fixed |
| bullseye (security) | 5.10.226-1 | fixed |
| bookworm | 6.1.115-1 | fixed |
| bookworm (security) | 6.1.119-1 | fixed |
| trixie | 6.12.5-1 | fixed |
| sid | 6.12.6-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| linux | source | wheezy | (not affected) | | | |
| linux | source | jessie | 3.16.43-2+deb8u5 | | DSA-3981-1 | |
| linux | source | stretch | 4.9.30-2+deb9u5 | | DSA-3981-1 | |
| linux | source | (unstable) | 4.11.11-1 | | | |
Notes
[wheezy] - linux <not-affected> (Vulnerable code not present)
https://www.openwall.com/lists/oss-security/2017/06/23/5
https://www.spinics.net/lists/kvm/msg151817.html
https://bugzilla.redhat.com/show_bug.cgi?id=1464473
Fixed by: https://git.kernel.org/linus/c8401dda2f0a00cd25c0af6a95ed50e478d25de4