kernel: Incorrect fix for CVE-2016-9178
Published Nov 28, 2016
7.8
HIGHCVSS 3.0
EPSS 1.45%
Description
The __get_user_asm_ex macro in arch/x86/include/asm/uaccess.h in the Linux kernel 4.4.22 through 4.4.28 contains extended asm statements that are incompatible with the exception table, which allows local users to obtain root access on non-SMEP platforms via a crafted application. NOTE: this vulnerability exists because of incorrect backporting of the CVE-2016-9178 patch to older kernels.
Affected products
No data.
- 4.4.22
- 4.4.23
- 4.4.24
- 4.4.25
- 4.4.26
- 4.4.27
- 4.4.28
No data.
Red Hat Enterprise Linux 5
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-rt
Not affected
Red Hat Enterprise MRG 2
realtime-kernel
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise MRG 2 | realtime-kernel | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
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:H/I:H/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:M/Au:N/C:C/I:C/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 | 1.45% (0.01454) | 72.50th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.45% (0.01454) | 69.95th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.17% (0.00173) | 36.37th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.09% (0.00094) | 41.52th | v3 (v2023.03.01) |
| Jul 13, 2024 | 0.09% (0.00094) | 40.28th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.09% (0.00094) | 38.27th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.02% (0.01018) | 40.69th | v2 (v2022.01.01) |
| Sep 10, 2022 | 1.02% (0.01018) | 38.88th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.02% (0.01018) | 36.86th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.02% (0.01018) | 19.50th | v2 (v2022.01.01) |
References (9)
- http://www.openwall.com/lists/oss-security/2016/11/07/4 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.securityfocus.com/bid/94545 vdb-entryx_refsource_BID
- http://www.ubuntu.com/usn/USN-3146-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-3146-2 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/security/cve/CVE-2016-9644 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1399528 Issue Tracking
- https://lwn.net/Articles/705220/ x_refsource_CONFIRMProduct
- https://nvd.nist.gov/vuln/detail/CVE-2016-9644
- https://www.cve.org/CVERecord?id=CVE-2016-9644
| Link | Providers | Tags |
|---|---|---|
| http://www.openwall.com/lists/oss-security/2016/11/07/4 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| http://www.securityfocus.com/bid/94545 | vdb-entryx_refsource_BID | |
| http://www.ubuntu.com/usn/USN-3146-1 | vendor-advisoryx_refsource_UBUNTU | |
| http://www.ubuntu.com/usn/USN-3146-2 | vendor-advisoryx_refsource_UBUNTU | |
| https://access.redhat.com/security/cve/CVE-2016-9644 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1399528 | Issue Tracking | |
| https://lwn.net/Articles/705220/ | x_refsource_CONFIRMProduct | |
| https://nvd.nist.gov/vuln/detail/CVE-2016-9644 | ||
| https://www.cve.org/CVERecord?id=CVE-2016-9644 |
Change history (0)
No recorded changes yet.