CVE-2016-4578
Description
sound/core/timer.c in the Linux kernel through 4.6 does not initialize certain r1 data structures, which allows local users to obtain sensitive information from kernel stack memory via crafted use of the ALSA timer interface, related to the (1) snd_timer_user_ccallback and (2) snd_timer_user_tinterrupt functions.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
Linux Kernel 4.4 (Ubuntu 16.04) - 'snd_timer_user_ccallback()' Kernel Pointer Leak
OS impact
Linux kernel Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Red Hat Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| 7.0 | Affected | — |
SUSE Affected 3 releases
| Version | Status | Fixed in |
|---|---|---|
| 42.1 | Affected | — |
| 13.1 | Affected | — |
| — | Affected | — |
Ubuntu Affected 4 releases
| Version | Status | Fixed in |
|---|---|---|
| 16.04 | Affected | — |
| 15.10 | Affected | — |
| 14.04 | Affected | — |
| 12.04 | Affected | — |
Debian Mixed 6 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 4.5.5-1 |
| sid | Fixed | 4.5.5-1 |
| forky | Fixed | 4.5.5-1 |
| bullseye | Fixed | 4.5.5-1 |
| bookworm | Fixed | 4.5.5-1 |
| 8.0 | Affected | — |
References
- https://www.suse.com/security/cve/CVE-2016-4578.html
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9a47e9cff994f37f7f0dbd9ae23740d0f64f9fe6
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e4ec8cc8039a7063e24204299b462bd1383184a5
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00044.html
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00052.html
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00054.html
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00000.html
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00007.html
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00044.html
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00055.html
- http://rhn.redhat.com/errata/RHSA-2016-2574.html
- http://rhn.redhat.com/errata/RHSA-2016-2584.html
- http://www.debian.org/security/2016/dsa-3607
- http://www.openwall.com/lists/oss-security/2016/05/11/5
- http://www.securityfocus.com/bid/90535
- http://www.ubuntu.com/usn/USN-3016-1
- http://www.ubuntu.com/usn/USN-3016-2
- http://www.ubuntu.com/usn/USN-3016-3
- http://www.ubuntu.com/usn/USN-3016-4
- http://www.ubuntu.com/usn/USN-3017-1
- http://www.ubuntu.com/usn/USN-3017-2
- http://www.ubuntu.com/usn/USN-3017-3
- http://www.ubuntu.com/usn/USN-3018-1
- http://www.ubuntu.com/usn/USN-3018-2
- http://www.ubuntu.com/usn/USN-3019-1
CWEs
CWE-200
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.