CVE-2016-8649

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 9.1Exploit: None knownExposed: 0

A fix is available — apply it.

lxc-attach in LXC before 1.0.9 and 2.x before 2.0.6 allows an attacker inside of an unprivileged container to use an inherited file descriptor, of the host's /proc, to access the rest of the host's filesystem via the openat() family of syscalls.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
47(Track)
EG Risk 47/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
85%
KEV
Not listed

Published

May 1, 2017

Last Modified

June 17, 2026

Advisory Details (6)

Auto-updated May 19, 2026
Patch available. Sources: redhat.
redhat Patch Available

1398242 – (CVE-2016-8649) CVE-2016-8649 lxc: lxc-attach to malicious container allows access to host

https://bugzilla.redhat.com/show_bug.cgi?id=1398242
generic

Bug #1639345 “lxc-attach to malicious container allows access to...” : Bugs : lxc package : Ubuntu

https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1639345
generic Patch Available

#845465 - lxc: CVE-2016-8649: attach: do not send procfd to attached process - Debian Bug report logs

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=845465
generic
http://www.securityfocus.com/bid/94498
generic

CVE-2016-8649

https://security-tracker.debian.org/tracker/CVE-2016-8649
generic

attach: do not send procfd to attached process · lxc/lxc@81f466d · GitHub

https://github.com/lxc/lxc/commit/81f466d05f2a89cb4f122ef7f593ff3f279b165c

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulxc1 (2.0.5-0ubuntu1.2) @ yakkety2026-05-22ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× in last 7d / 39× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-26 14:50 UTCEPSS rescore
  2. 2026-07-25 14:13 UTCEPSS rescore
  3. 2026-07-24 14:13 UTCEPSS rescore
  4. 2026-07-23 14:15 UTCEPSS rescore
  5. 2026-07-23 01:24 UTCEG score recompute
  6. 2026-07-22 22:03 UTCEG score recompute
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  17. 2026-07-16 16:59 UTCEPSS rescore
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  19. 2026-07-15 16:54 UTCEPSS rescore
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  21. 2026-07-15 01:56 UTCEPSS rescore
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  23. 2026-07-12 05:43 UTCEPSS rescore
  24. 2026-07-12 05:43 UTCEPSS rescore
  25. 2026-07-11 23:41 UTCOSV refresh
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  1. 2026-07-11 08:24 UTCEPSS rescore
  2. 2026-07-09 19:06 UTCEPSS rescore
  3. 2026-07-08 15:10 UTCEPSS rescore
  4. 2026-07-07 13:42 UTCEPSS rescore
  5. 2026-07-06 16:24 UTCEPSS rescore
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  14. 2026-06-29 14:03 UTCEPSS rescore
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  16. 2026-06-28 04:53 UTCEPSS rescore
  17. 2026-06-27 03:05 UTCEPSS rescore
  18. 2026-06-25 13:47 UTCEPSS rescore
  19. 2026-06-24 14:02 UTCEPSS rescore
  20. 2026-06-23 06:00 UTCOSV refresh
  21. 2026-06-22 14:23 UTCEPSS rescore
  22. 2026-06-21 01:57 UTCEPSS rescore
  23. 2026-06-21 01:57 UTCEPSS rescore
  24. 2026-06-19 19:23 UTCEPSS rescore
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  26. 2026-06-18 17:50 UTCEPSS rescore
  27. 2026-06-18 17:50 UTCEPSS rescore
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  31. 2026-06-15 17:45 UTCEPSS rescore
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  36. 2026-06-12 23:09 UTCEPSS rescore
  37. 2026-06-11 13:57 UTCEPSS rescore
  38. 2026-06-08 14:14 UTCEPSS rescore
  39. 2026-06-07 15:22 UTCEPSS rescore
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  41. 2026-06-06 13:45 UTCEPSS rescore
  42. 2026-06-06 13:45 UTCEPSS rescore
  43. 2026-06-06 04:22 UTCOSV refresh
  44. 2026-06-05 22:44 UTCEPSS rescore
  45. 2026-06-05 06:08 UTCEPSS rescore
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  47. 2026-06-04 13:10 UTCEPSS rescore
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  49. 2026-06-02 20:10 UTCEPSS rescore
  50. 2026-06-01 13:49 UTCEPSS rescore
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  52. 2026-05-31 22:28 UTCEPSS rescore
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  54. 2026-05-31 00:14 UTCEPSS rescore
  55. 2026-05-29 13:41 UTCEPSS rescore
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  63. 2026-05-24 16:44 UTCEPSS rescore
  64. 2026-05-22 21:15 UTCEPSS rescore
  65. 2026-05-22 13:41 UTCEG score recompute
  66. 2026-05-22 13:41 UTCVendor advisory
  67. 2026-05-22 13:41 UTCGHSA enrichment
  68. 2026-05-20 22:37 UTCEPSS rescore
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  73. 2026-05-18 21:30 UTCEPSS rescore
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  75. 2026-05-18 21:30 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2016-8649?
CVE-2016-8649 is a critical vulnerability published on May 1, 2017. lxc-attach in LXC before 1.0.9 and 2.x before 2.0.6 allows an attacker inside of an unprivileged container to use an inherited file descriptor, of the host's /proc, to access the rest of the host's filesystem via the openat() family of syscalls.
When was CVE-2016-8649 disclosed?
CVE-2016-8649 was first published in the National Vulnerability Database on May 1, 2017, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-8649 actively exploited?
CVE-2016-8649 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3% probability of exploitation in the next 30 days, which ranks it in the top 15.0% of all scored CVEs.
What is the CVSS score of CVE-2016-8649?
CVE-2016-8649 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2016-8649?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-8649, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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