The __get_user_asm_ex macro in arch/x86/include/asm/uaccess.h in the Linux kernel 4.4.22…
Priority LOW 37CWE-264Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-264.
Summary
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.
Why it matters now
EPSS 0.01454 73rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:4.4.22:*:*:*:*:*:*:* | 4.4.22 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.4.23:*:*:*:*:*:*:* | 4.4.23 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.4.24:*:*:*:*:*:*:* | 4.4.24 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.4.25:*:*:*:*:*:*:* | 4.4.25 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.4.26:*:*:*:*:*:*:* | 4.4.26 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.4.27:*:*:*:*:*:*:* | 4.4.27 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.4.28:*:*:*:*:*:*:* | 4.4.28 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:4.4.22:*:*:*:*:*:*:* Versions 4.4.22 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.4.23:*:*:*:*:*:*:* Versions 4.4.23 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.4.24:*:*:*:*:*:*:* Versions 4.4.24 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.4.25:*:*:*:*:*:*:* Versions 4.4.25 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.4.26:*:*:*:*:*:*:* Versions 4.4.26 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.4.27:*:*:*:*:*:*:* Versions 4.4.27 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.4.28:*:*:*:*:*:*:* Versions 4.4.28 Vulnerable ·Linux
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
Not affected: 4 products
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise MRG 2
Timeline
- 2026-10-02 Threatist record created from CVE-2016-9644
- 2026-10-03 Alias added: GHSA-qx8p-8rg2-4j84
References
More Linux Kernel vulnerabilities
- TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
- TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
- TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
- TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2016-9644 · CVE Program
- CVE-2016-9644 · NVD
- FIRST EPSS
- GHSA-qx8p-8rg2-4j84 · GitHub Advisory Database · CC BY 4.0
- CVE-2016-9644 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences