CVE-2016-9793

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-14. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.6%CVSS: 7.8Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

The sock_setsockopt function in net/core/sock.c in the Linux kernel before 4.8.14 mishandles negative values of sk_sndbuf and sk_rcvbuf, which allows local users to cause a denial of service (memory corruption and system crash) or possibly have unspecified other impact by leveraging the CAP_NET_ADMIN capability for a crafted setsockopt system call with the (1) SO_SNDBUFFORCE or (2) SO_RCVBUFFORCE option.

CVSS v3
7.8
EG Score
7.8HIGHmedium confidence
EG Risk
56
EG Risk 56/100CISA SSVC

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
Severity78% × 45%
Exploitation40% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.6%
EPSS %ILE
74th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (EG-KEV: elevated) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

December 28, 2016

Last Modified

June 17, 2026

Advisory Details (9)

Auto-updated Oct 8, 2026
Patch available. Sources: redhat, github_commit.
github_commit

commit b98b0bc8c431 (torvalds/linux)

Fix landed in torvalds/linux commit b98b0bc8c431 — awaiting tagged release

https://github.com/torvalds/linux/commit/b98b0bc8c431e3ceb4b26b0dfc8db509518fb290
redhatMentions a patch (unverified)

1402013 – (CVE-2016-9793) CVE-2016-9793 kernel: Signed overflow for SO_{SND|RCV}BUFFORCE

Affected: Red Hat Enterprise Linux 5 and 6. This issue does affect kernels 7, MRG-2 and realtime kernels and plans to be fixed in a fut

https://bugzilla.redhat.com/show_bug.cgi?id=1402013
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2017:0933
redhatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2017:0932
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2017:0931
generic

CVE-2016-9793 - PSIRT.COM

http://www.securityfocus.com/bid/94655
generic

oss-security - Re: CVE Request: Linux: signed overflows for SO_{SND|RCV}BUFFORCE

http://www.openwall.com/lists/oss-security/2016/12/03/1
generic
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.14
generic

net: avoid signed overflows for SO_{SND|RCV}BUFFORCE - kernel/git/torvalds/linux.git - Linux kernel source tree

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b98b0bc8c431e3ceb4b26b0dfc8db509518fb290

Vendor Advisories for CVE-2016-9793(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(11)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-image-4.4.0-1040-raspi2 (4.4.0-1040.47) @ xenial2026-05-22ubuntu
ubuntulinux-image-3.13.0-107-generic-lpae (3.13.0-107.154~precise1) @ precise2026-05-22ubuntu
ubuntulinux-image-extra-4.4.0-59-generic (4.4.0-59.80~14.04.1) @ trusty2026-05-22ubuntu
ubuntulinux-image-4.8.0-34-powerpc-smp (4.8.0-34.36) @ yakkety2026-05-22ubuntu
ubuntulinux-image-4.4.0-1044-snapdragon (4.4.0-1044.48) @ xenial2026-05-22ubuntu
ubuntulinux-image-extra-3.13.0-107-generic (3.13.0-107.154) @ trusty2026-05-22ubuntu
ubuntulinux-image-extra-4.4.0-59-generic (4.4.0-59.80) @ xenial2026-05-22ubuntu
ubuntulinux-image-raspi2 (4.8.0.1022.25) @ yakkety2026-05-22ubuntu
redhatkernel-rt-1:3.10.0-514.rt56.219.el6rt2017-04-12redhat
redhatkernel-rt-0:3.10.0-514.16.1.rt56.437.el72017-04-12redhat
redhatkernel-0:3.10.0-514.16.1.el72017-04-12redhat

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.

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 4.8.15-1: fixed in 4.8.15-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 4.8.15-1: fixed in 4.8.15-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 4.8.15-1: fixed in 4.8.15-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 4.8.15-1: fixed in 4.8.15-1
—
Debian:7(1)
PackageVulnerable rangeFix by version rangeDependents
linux3.2.41-2 ... 3.2.82-1 (61 versions)
  • every version up to 3.2.84-1: fixed in 3.2.84-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(10)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 8× in last 7d / 28× 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.

Showing the most recent 100 of 162 total refreshes for this CVE.

  1. 2026-10-09 20:01 UTCEPSS rescore
  2. 2026-10-08 16:35 UTCEPSS rescore
  3. 2026-10-08 12:24 UTCOSV refresh
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  10. 2026-09-30 09:18 UTCEG score recompute
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  20. 2026-09-18 18:06 UTCOSV refresh
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  8. 2026-09-01 03:31 UTCEPSS rescore
  9. 2026-08-30 21:04 UTCOSV refresh
  10. 2026-08-28 21:35 UTCEPSS rescore
  11. 2026-08-27 14:20 UTCEPSS rescore
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  21. 2026-08-14 08:16 UTCOSV refresh
  22. 2026-08-12 13:46 UTCEPSS rescore
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  24. 2026-08-09 13:42 UTCEPSS rescore
  25. 2026-08-08 16:32 UTCEPSS rescore
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  40. 2026-07-23 14:15 UTCEPSS rescore
  41. 2026-07-23 01:24 UTCEG score recompute
  42. 2026-07-22 22:04 UTCEG score recompute
  43. 2026-07-22 14:04 UTCEPSS rescore
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  46. 2026-07-20 17:04 UTCEPSS rescore
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  62. 2026-07-12 05:22 UTCOSV refresh
  63. 2026-07-11 08:24 UTCEPSS rescore
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Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-41995
    First seen Mar 22, 2017

    Linux Kernel 3.11 < 4.8 0 - 'SO_SNDBUFFORCE' / 'SO_RCVBUFFORCE' Local Privilege Escalation

    Open source ↗

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2016-9793?
CVE-2016-9793 is a high vulnerability published on December 28, 2016. The socksetsockopt function in net/core/sock.c in the Linux kernel before 4.8.14 mishandles negative values of sksndbuf and skrcvbuf, which allows local users to cause a denial of service (memory corruption and system crash) or possibly have unspecified other impact by leveraging the CAPNETADMIN…
When was CVE-2016-9793 disclosed?
CVE-2016-9793 was first published on December 28, 2016, 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-2016-9793 actively exploited?
CVE-2016-9793 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.6% probability of exploitation in the next 30 days (74th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2016-9793?
CVE-2016-9793 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2016-9793?
A fix for CVE-2016-9793 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2016-9793 are linked in the Vendor Advisories panel on this page.

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