CVE-2026-57843

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreHIGH confidence

Score 5.5 from GitHub Security Advisory published 2026-09-11. a secondary CVSS source baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

NetBSD contains an information disclosure vulnerability in mm_open() within sys/dev/mm.c that allows unprivileged local users to obtain real kernel virtual addresses by opening world-accessible devices such as /dev/null or /dev/zero, which incorrectly receive the PK_KMEM process flag. Attackers can exploit this misconfigured flag to bypass the CANSEE_KPTR obfuscation mechanism and read kernel virtual addresses for sensitive kernel structures including struct proc, kauth_cred, filedesc, and vmspace via sysctl KERN_PROC queries.

CVSS v3
5.5
EG Score
5.5(high)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
1%
KEV
Not listed

Published

September 11, 2026

Last Modified

September 18, 2026

Advisory Details (2)

Auto-updated Sep 11, 2026
No patch confirmed yet.
generic

NetBSD mm_open() PK_KMEM Flag Kernel Pointer Information Disclosure | Advisories | VulnCheck

https://www.vulncheck.com/advisories/netbsd-mm-open-pk-kmem-flag-kernel-pointer-information-disclosure
generic

NetBSD Problem Report #60373: compat32: kernel use-after-free in recvmsg

https://gnats.netbsd.org/60373

Vendor Advisories for CVE-2026-57843(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 22× in last 7d / 30× 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. 2026-09-20 17:14 UTCGHSA enrichment
  2. 2026-09-19 17:52 UTCEG score recompute
  3. 2026-09-19 17:52 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 18:33 UTCEG score recompute
  6. 2026-09-18 18:33 UTCGHSA enrichment
  7. 2026-09-18 17:29 UTCEG score recompute
  8. 2026-09-18 17:29 UTCGHSA enrichment
  9. 2026-09-18 09:37 UTCEG score recompute
  10. 2026-09-18 09:37 UTCGHSA enrichment
  11. 2026-09-17 19:31 UTCEPSS rescore
  12. 2026-09-17 10:18 UTCEG score recompute
  13. 2026-09-17 10:18 UTCGHSA enrichment
  14. 2026-09-16 14:08 UTCEPSS rescore
  15. 2026-09-16 10:59 UTCEG score recompute
  16. 2026-09-16 10:58 UTCGHSA enrichment
  17. 2026-09-16 05:15 UTCEPSS rescore
  18. 2026-09-15 11:39 UTCEG score recompute
  19. 2026-09-15 11:39 UTCGHSA enrichment
  20. 2026-09-15 03:11 UTCEPSS rescore
  21. 2026-09-14 12:20 UTCEG score recompute
  22. 2026-09-14 12:20 UTCGHSA enrichment
  23. 2026-09-13 16:47 UTCEPSS rescore
  24. 2026-09-13 13:01 UTCEG score recompute
  25. 2026-09-13 13:01 UTCGHSA enrichment
Show 5 more
  1. 2026-09-12 13:42 UTCEG score recompute
  2. 2026-09-12 13:42 UTCGHSA enrichment
  3. 2026-09-11 14:23 UTCEG score recompute
  4. 2026-09-11 13:55 UTCEG score recompute
  5. 2026-09-11 13:54 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-57843?
CVE-2026-57843 is a medium vulnerability published on September 11, 2026. NetBSD contains an information disclosure vulnerability in mmopen() within sys/dev/mm.c that allows unprivileged local users to obtain real kernel virtual addresses by opening world-accessible devices such as /dev/null or /dev/zero, which incorrectly receive the PKKMEM process flag. Attackers can…
When was CVE-2026-57843 disclosed?
CVE-2026-57843 was first published in the National Vulnerability Database on September 11, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-57843 actively exploited?
CVE-2026-57843 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 99.0% of all scored CVEs.
What is the CVSS score of CVE-2026-57843?
CVE-2026-57843 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-57843?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-57843, 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-57843

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