The Linux kernel NFSD implementation prior to versions 5.19.17 and 6.0.2 are vulnerable to buffer overflow. NFSD tracks the number of pages held by each NFSD thread by combining the receive and send buffers of a remote procedure call (RPC) into a single array of pages. A client can force the send buffer to shrink by sending an RPC message over TCP with garbage data added at the end of the message. The RPC message with garbage data is still correctly formed according to the specification and is passed forward to handlers. Vulnerable code in NFSD is not expecting the oversized request and writes beyond the allocated buffer space. CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVE-2022-43945
“—” beside the score: it is equal to NVD's CVSS score.
Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2022-11-05. NVD baseline CVSS 7.5; sources differ by 0.0.
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5HIGHmedium confidence
- EG Risk
- 65EG Risk 65/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity75% × 45%Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation40% × 40%EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.Automatability100% × 15%CISA's SSVC Automatable value: yes (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.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
- 22%
- EPSS %ILE
- 97th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.
- EG Severity
- 7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 22% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-20). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; 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 none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.
In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
November 4, 2022
Last Modified
October 14, 2026
Advisory Details (4)
Auto-updated Oct 14, 2026Packet Storm
http://packetstormsecurity.com/files/171289/Kernel-Live-Patch-Security-Notice-LNS-0092-1.htmlMerge tag 'nfsd-6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux - kernel/git/torvalds/linux.git - Linux kernel source tree
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f90497a16e434c2211c66e3de8e77b17868382b8Vendor Advisories for CVE-2022-43945(8)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2023:0832Red Hat Product SecurityHigh
Red Hat Security Advisory: kernel security and bug fix update
- RHSA-2023:0348Red Hat Product SecurityHigh
Red Hat Security Advisory: kpatch-patch security update
- RHSA-2023:0300Red Hat Product SecurityHigh
Red Hat Security Advisory: kernel-rt security and bug fix update
- RHSA-2023:0334Red Hat Product SecurityHigh
Red Hat Security Advisory: kernel security and bug fix update
- RHSA-2022:9082Red Hat Product SecurityHigh
Red Hat Security Advisory: kpatch-patch security update
- RHSA-2022:8973Red Hat Product SecurityHigh
Red Hat Security Advisory: kernel security and bug fix update
- RHSA-2022:8974Red Hat Product SecurityHigh
Red Hat Security Advisory: kernel-rt security and bug fix update
- CVE-2022-43945Microsoft Security Response Center (MSRC)High
The Linux kernel NFSD implementation prior to versions 5.19.17 and 6.0.2 are vulnerable to buffer overflow. NFSD tracks the number of pages held by each NFSD thread by combining the receive and send buffers of a remote procedure call (RPC) into a single array of pages. A client can force the send buffer to shrink by sending an RPC message over TCP with garbage data added at the end of the message. The RPC message with garbage data is still correctly formed according to the specification and is passed forward to handlers. Vulnerable code in NFSD is not expecting the oversized request and writes beyond the allocated buffer space. CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Patch Availability(28)
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
(4 across 4 ecosystems)
Debian:11(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| linux | 5.10.103-1 ... 5.10.92-2 (41 versions) |
| — |
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| linux | — |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| linux | — |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| linux | — |
| — |
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Additional Vendor Advisories
(17)
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.
- Red HatRHSA-2023:0839IMPORTANT2022-10-03
RHSA-2023:0839 — Important
- Red HatRHSA-2023:0854IMPORTANT2022-10-03
RHSA-2023:0854 — Important
- UbuntuLSN-0092-1HIGH
Kernel Live Patch Security Notice
- UbuntuUSN-5754-1HIGH
Linux kernel vulnerabilities
- UbuntuUSN-5754-2HIGH
Linux kernel (Azure) vulnerabilities
- UbuntuUSN-5755-1HIGH
Linux kernel vulnerabilities
- UbuntuUSN-5755-2HIGH
Linux kernel vulnerabilities
- UbuntuUSN-5773-1HIGH
Linux kernel (OEM) vulnerabilities
- UbuntuUSN-5779-1HIGH
Linux kernel (Azure) vulnerabilities
- UbuntuUSN-5789-1HIGH
Linux kernel (OEM) vulnerabilities
- UbuntuUSN-5794-1HIGH
Linux kernel (AWS) vulnerabilities
- UbuntuUSN-5802-1HIGH
Linux kernel vulnerabilities
- UbuntuUSN-5804-1HIGH
Linux kernel vulnerabilities
- UbuntuUSN-5804-2HIGH
Linux kernel vulnerabilities
- UbuntuUSN-5808-1HIGH
Linux kernel (IBM) vulnerabilities
- UbuntuUSN-5813-1HIGH
Linux kernel vulnerabilities
- UbuntuUSN-5829-1HIGH
Linux kernel (Raspberry Pi) vulnerabilities
Data Freshness Timeline
(refreshed 11× in last 7d / 38× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 92 of 215 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 8 repeat rows among the latest 100 are merged into the row they repeat. The 123 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-10-22 16:30 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-10-21 16:29 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-10-21 05:52 UTCEG score recompute
- 2026-10-21 05:52 UTCVendor advisory
- 2026-10-21 05:52 UTCGHSA enrichmentGHSA-42x7-fjc5-38vr · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-10-20 16:29 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-10-19 16:28 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-10-18 16:28 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-10-18 08:24 UTCEG score recompute
- 2026-10-17 16:29 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-10-16 16:35 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-10-15 16:28 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-10-14 19:32 UTCVendor advisory
- 2026-10-14 19:32 UTCGHSA enrichmentGHSA-42x7-fjc5-38vr · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-10-14 18:38 UTCEG score recompute
- 2026-10-14 18:38 UTCVendor advisory
- 2026-10-14 18:37 UTCGHSA enrichmentGHSA-42x7-fjc5-38vr · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-10-14 16:29 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-10-13 16:29 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-10-12 18:45 UTCEG score recompute
- 2026-10-12 16:30 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-10-11 22:08 UTCEG score recompute
- 2026-10-11 13:44 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-10-10 19:57 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-10-09 20:04 UTCEPSS rescoreEPSS 22% · 97th percentile
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- 2026-10-08 17:05 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-10-07 23:45 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-10-07 18:54 UTCOSV refresh
- 2026-10-06 15:14 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-10-05 17:40 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-10-03 14:23 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-10-02 16:23 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-10-01 19:47 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-09-30 16:09 UTCEG score recompute
- 2026-09-30 15:01 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-09-27 13:42 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-09-26 15:55 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-09-26 00:22 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-09-23 13:45 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-09-19 15:38 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-09-18 01:06 UTCOSV refresh
- 2026-09-16 14:05 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-09-16 05:10 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-09-15 03:07 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-09-12 14:57 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-09-11 14:50 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-09-11 09:33 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-09-08 21:57 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-09-06 13:45 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-09-05 15:25 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-09-04 13:57 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-09-04 05:04 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-09-02 14:09 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-09-01 13:51 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-08-30 19:14 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-08-30 01:43 UTCOSV refresh
- 2026-08-30 01:19 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-08-28 21:38 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-08-27 14:22 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-08-26 14:43 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-08-25 13:46 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-08-24 14:13 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-08-21 23:46 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-08-20 22:53 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-08-19 17:01 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-08-18 13:45 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-08-17 13:44 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-08-16 14:53 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-08-16 02:12 UTCEPSS rescoreEPSS 22% · 97th percentile
- 2026-08-15 01:27 UTCEPSS rescoreEPSS 21% · 97th percentile
- 2026-08-13 21:58 UTCEPSS rescoreEPSS 21% · 97th percentile
- 2026-08-13 12:51 UTCOSV refresh
- 2026-08-12 13:48 UTCEPSS rescoreEPSS 21% · 97th percentile
- 2026-08-11 13:39 UTCEPSS rescoreEPSS 21% · 97th percentile
- 2026-08-08 16:34 UTCEPSS rescoreEPSS 21% · 97th percentile
- 2026-08-07 16:24 UTCEPSS rescoreEPSS 21% · 97th percentile
- 2026-08-06 13:44 UTCEPSS rescoreEPSS 21% · 97th percentile
- 2026-08-05 19:15 UTCEPSS rescoreEPSS 21% · 97th percentile
- 2026-08-04 15:07 UTCEPSS rescoreEPSS 21% · 97th percentile
- 2026-08-04 10:35 UTCEPSS rescoreEPSS 21% · 97th percentile
- 2026-08-02 02:24 UTCEPSS rescoreEPSS 21% · 97th percentile
- 2026-08-01 04:13 UTCEPSS rescoreEPSS 21% · 97th percentile
- 2026-07-30 16:25 UTCEPSS rescoreEPSS 21% · 97th percentile
- 2026-07-28 20:17 UTCOSV refresh
- 2026-07-28 15:34 UTCEPSS rescoreEPSS 21% · 97th percentile
- 2026-07-26 14:52 UTCEPSS rescoreEPSS 21% · 97th percentile
- 2026-07-25 14:15 UTCEPSS rescoreEPSS 21% · 97th percentile
- 2026-07-24 14:15 UTCEPSS rescoreEPSS 21% · 97th percentile
- 2026-07-23 14:16 UTCEPSS rescoreEPSS 21% · 97th percentile
- 2026-07-23 02:14 UTCEG score recompute
- 2026-07-22 23:02 UTCEG score recompute
- 2026-07-22 14:06 UTCEPSS rescoreEPSS 21% · 97th percentile
Related CVEs(same vendor + same CWE)
Same vendor
10 shownubuntu:LSN-0092-1 · ubuntu:USN-5794-1 · ubuntu:USN-5754-1
Frequently asked(5)
What is CVE-2022-43945?
When was the CVE record for CVE-2022-43945 published?
Is CVE-2022-43945 actively exploited?
What is the CVSS score of CVE-2022-43945?
How do I remediate CVE-2022-43945?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2022-43945
Is Your Infrastructure Affected by CVE-2022-43945?
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