CVE-2017-2636
A public proof of concept exists; no exploitation attested.
- Published2017-03-07
- Fixed in4.10.3 · 4.9.15 · 4.4.54 · 4.1.49 · 3.18.49 · 3.16.42
- WeaknessCWE-362 · CWE-415
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
Race condition in drivers/tty/n_hdlc.c in the Linux kernel through 4.10.1 allows local users to gain privileges or cause a denial of service (double free) by setting the HDLC line discipline.
Timeline
dates in UTC- 2017-03-0722:59CVE publishedNVD
- 2026-10-2319:23First public proof of conceptPoC-in-GitHub
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-2636?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-2636?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 4.10 | ≥ 4.10, < 4.10.3 | 4.10.3 | NVD |
| 4.x | ≥ 4.5, < 4.9.15 | 4.9.15 | NVD |
| 4.x | ≥ 4.2, < 4.4.54 | 4.4.54 | NVD |
| 4.1 | ≥ 3.19, < 4.1.49 | 4.1.49 | NVD |
| 3.x | ≥ 3.17, < 3.18.49 | 3.18.49 | NVD |
| 3.x | ≥ 3.13, < 3.16.42 | 3.16.42 | NVD |
| 3.x | ≥ 3.11, < 3.12.72 | 3.12.72 | NVD |
| 3.x | ≥ 3.3, < 3.10.106 | 3.10.106 | NVD |
| 3.2 | ≥ 2.6.31, < 3.2.87 | 3.2.87 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 8.0 | = 8.0 | no fix published | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Linux linux kernel to 4.10.3 · 4.9.15 · 4.4.54 · 4.1.49 · 3.18.49 · 3.16.42 · 3.12.72 · 3.10.106
Advisories and patches
- www.openwall.comPatch
- bugzilla.redhat.comMitigation
Detection
read 2026-10-23 19:23 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
Sources
- NVDCVSS 3.17read 2026-10-23
- NVDCVSS 2.06.9read 2026-10-23
- NVDweakness (CWE)CWE-362, CWE-415read 2026-10-23
- FIRST EPSSEPSS score1.0 %2026-10-23
- PoC-in-GitHubproof of concept1read 2026-10-23
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- Published
- 2017-03-07
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2017-2636?
Is CVE-2017-2636 actively exploited?
What is the CVSS score for CVE-2017-2636?
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