Ubuntu.comUB:CVE-2016-2549CVE-2016-2549
6.2 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
2.1 Low
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:N/I:N/A:P
0.002 Low
EPSS
Percentile
52.5%
sound/core/hrtimer.c in the Linux kernel before 4.4.1 does not prevent
recursive callback access, which allows local users to cause a denial of
service (deadlock) via a crafted ioctl call.
However, the previous fix is still insufficient: it may still
cause a lockup when the ALSA timer instance reprograms itself
in its callback. Then it invokes the start function even in
snd_timer_interrupt() that is called in hrtimer callback itself, results
in a CPU stall. This is no hypothetical problem but actually triggered
by syzkaller fuzzer.
Bugs
Notes
| Author | Note |
|---|---|
| jdstrand | android kernels (flo, goldfish, grouper, maguro, mako and manta) are not supported on the Ubuntu Touch 14.10 and earlier preview kernels linux-lts-saucy no longer receives official support linux-lts-quantal no longer receives official support |
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| ubuntu | 12.04 | noarch | linux | < 3.2.0-102.142 | UNKNOWN |
| ubuntu | 14.04 | noarch | linux | < 3.13.0-83.127 | UNKNOWN |
| ubuntu | 15.04 | noarch | linux | < 3.19.0-56.62 | UNKNOWN |
| ubuntu | 15.10 | noarch | linux | < 4.2.0-30.35 | UNKNOWN |
| ubuntu | 12.04 | noarch | linux-armadaxp | < 3.2.0-1665.90 | UNKNOWN |
| ubuntu | 12.04 | noarch | linux-lts-trusty | < 3.13.0-83.127~precise1 | UNKNOWN |
| ubuntu | 14.04 | noarch | linux-lts-utopic | < 3.16.0-67.87~14.04.1 | UNKNOWN |
| ubuntu | 14.04 | noarch | linux-lts-vivid | < 3.19.0-56.62~14.04.1 | UNKNOWN |
| ubuntu | 14.04 | noarch | linux-lts-wily | < 4.2.0-30.35~14.04.1 | UNKNOWN |
| ubuntu | 15.10 | noarch | linux-raspi2 | < 4.2.0-1025.32 | UNKNOWN |
References
git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2ba1fe7a06d3624f9a7586d672b55f08f7c670f3
www.openwall.com/lists/oss-security/2016/02/23/11
launchpad.net/bugs/cve/CVE-2016-2549
nvd.nist.gov/vuln/detail/CVE-2016-2549
security-tracker.debian.org/tracker/CVE-2016-2549
ubuntu.com/security/notices/USN-2929-1
ubuntu.com/security/notices/USN-2929-2
ubuntu.com/security/notices/USN-2930-1
ubuntu.com/security/notices/USN-2930-2
ubuntu.com/security/notices/USN-2930-3
ubuntu.com/security/notices/USN-2931-1
ubuntu.com/security/notices/USN-2932-1
ubuntu.com/security/notices/USN-2967-1
ubuntu.com/security/notices/USN-2967-2
www.cve.org/CVERecord?id=CVE-2016-2549
Related
6.2 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
2.1 Low
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:N/I:N/A:P
0.002 Low
EPSS
Percentile
52.5%