kernel: incorrect restoration of machine specific registers from userspace
Published Apr 27, 2016
5.5
MEDIUMCVSS 3.0
EPSS 0.39%
Description
The signal implementation in the Linux kernel before 4.3.5 on powerpc platforms does not check for an MSR with both the S and T bits set, which allows local users to cause a denial of service (TM Bad Thing exception and panic) via a crafted application.
Affected products
No data.
- ≤ 4.3.4
No data.
Red Hat Enterprise Linux 7
kernel-0:3.10.0-514.el7
Fixed · RHSA-2016:2574
Red Hat Enterprise Linux 7
kernel-rt-0:3.10.0-514.rt56.420.el7
Fixed · RHSA-2016:2584
Red Hat Enterprise Linux 4
kernel
Not affected
Red Hat Enterprise Linux 5
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise MRG 2
kernel-realtime
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | kernel-0:3.10.0-514.el7 | Fixed | RHSA-2016:2574 |
| Red Hat Enterprise Linux 7 | kernel-rt-0:3.10.0-514.rt56.420.el7 | Fixed | RHSA-2016:2584 |
| Red Hat Enterprise Linux 4 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise MRG 2 | kernel-realtime | Affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue does not affect the Linux kernels as shipped with Red Hat Enterprise Linux 5 and 6, This issue affects the Linux kernels as shipped with Red Hat Enterprise Linux 7 and MRG-2 realtime kernels. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/ .
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
AV:L/AC:M/Au:N/C:N/I:N/A:C
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.39% (0.00386) | 30.26th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.39% (0.00389) | 30.50th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.09% (0.00089) | 23.26th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.10% (0.00104) | 44.01th | v3 (v2023.03.01) |
| Dec 14, 2023 | 0.10% (0.00104) | 41.87th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.10% (0.00095) | 38.59th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.18% (0.01183) | 61.76th | v2 (v2022.01.01) |
| Oct 19, 2022 | 1.18% (0.01183) | 60.79th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.18% (0.01183) | 58.77th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.18% (0.01183) | 35.15th | v2 (v2022.01.01) |
References (11)
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d2b9d2a5ad5ef04ff978c9923d19730cb05efd55 x_refsource_CONFIRMVendor Advisory
- http://rhn.redhat.com/errata/RHSA-2016-2574.html vendor-advisoryx_refsource_REDHAT
- http://rhn.redhat.com/errata/RHSA-2016-2584.html vendor-advisoryx_refsource_REDHAT
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.3.5 x_refsource_CONFIRM
- http://www.openwall.com/lists/oss-security/2016/04/13/1 mailing-listx_refsource_MLIST
- http://www.securitytracker.com/id/1035594 vdb-entryx_refsource_SECTRACK
- https://access.redhat.com/security/cve/CVE-2015-8844 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1326540 x_refsource_CONFIRMIssue Tracking
- https://github.com/torvalds/linux/commit/d2b9d2a5ad5ef04ff978c9923d19730cb05efd55 x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2015-8844
- https://www.cve.org/CVERecord?id=CVE-2015-8844
| Link | Providers | Tags |
|---|---|---|
| http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d2b9d2a5ad5ef04ff978c9923d19730cb05efd55 | x_refsource_CONFIRMVendor Advisory | |
| http://rhn.redhat.com/errata/RHSA-2016-2574.html | vendor-advisoryx_refsource_REDHAT | |
| http://rhn.redhat.com/errata/RHSA-2016-2584.html | vendor-advisoryx_refsource_REDHAT | |
| http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.3.5 | x_refsource_CONFIRM | |
| http://www.openwall.com/lists/oss-security/2016/04/13/1 | mailing-listx_refsource_MLIST | |
| http://www.securitytracker.com/id/1035594 | vdb-entryx_refsource_SECTRACK | |
| https://access.redhat.com/security/cve/CVE-2015-8844 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1326540 | x_refsource_CONFIRMIssue Tracking | |
| https://github.com/torvalds/linux/commit/d2b9d2a5ad5ef04ff978c9923d19730cb05efd55 | x_refsource_CONFIRM | |
| https://nvd.nist.gov/vuln/detail/CVE-2015-8844 | ||
| https://www.cve.org/CVERecord?id=CVE-2015-8844 |
Change history (0)
No recorded changes yet.