CVE-2026-74436

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-15. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

In the Linux kernel, the following vulnerability has been resolved:

rxrpc: serialize kernel accept preallocation with socket teardown

rxrpc_kernel_charge_accept() reads rx->backlog without any socket/backlog synchronization and passes that raw pointer into rxrpc_service_prealloc_one(). A concurrent rxrpc_discard_prealloc() sets rx->backlog = NULL and frees the backlog rings, so a kernel preallocation worker can keep using a freed struct rxrpc_backlog while updating *_backlog_head/tail and array slots.

Serialize the state check and backlog lookup with the socket lock, and reject kernel preallocation once teardown has disabled listening or discarded the service backlog.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
30%
KEV
Not listed

Published

August 15, 2026

Last Modified

August 17, 2026

Advisory Details (5)

Auto-updated Aug 17, 2026
No patch confirmed yet.
generic

rxrpc: serialize kernel accept preallocation with socket teardown - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5
generic

rxrpc: serialize kernel accept preallocation with socket teardown - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dc175389b18c29a5303ee83169ec653adfae3e17
generic

rxrpc: serialize kernel accept preallocation with socket teardown - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/35a967ff8b24db09ee429c39c5b5e6571639997d
generic

rxrpc: serialize kernel accept preallocation with socket teardown - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1741378a7a83dfd8e53a9196730df709b903cd33
generic

rxrpc: serialize kernel accept preallocation with socket teardown - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0337cdba0c477f176c0459bed012109453184573

Vendor Advisories for CVE-2026-74436(1)

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

Data Freshness Timeline

(refreshed 46× in last 7d / 46× 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. 2026-08-21 07:36 UTCGHSA enrichment
  2. 2026-08-21 03:13 UTCEG score recompute
  3. 2026-08-21 03:12 UTCGHSA enrichment
  4. 2026-08-20 22:56 UTCEPSS rescore
  5. 2026-08-20 22:49 UTCGHSA enrichment
  6. 2026-08-20 18:25 UTCGHSA enrichment
  7. 2026-08-20 14:02 UTCGHSA enrichment
  8. 2026-08-20 09:38 UTCGHSA enrichment
  9. 2026-08-20 05:15 UTCGHSA enrichment
  10. 2026-08-20 00:51 UTCGHSA enrichment
  11. 2026-08-19 20:24 UTCEG score recompute
  12. 2026-08-19 20:24 UTCGHSA enrichment
  13. 2026-08-19 17:04 UTCEPSS rescore
  14. 2026-08-19 15:56 UTCGHSA enrichment
  15. 2026-08-19 11:30 UTCGHSA enrichment
  16. 2026-08-19 07:05 UTCGHSA enrichment
  17. 2026-08-19 02:42 UTCGHSA enrichment
  18. 2026-08-18 22:14 UTCGHSA enrichment
  19. 2026-08-18 17:49 UTCEG score recompute
  20. 2026-08-18 17:49 UTCGHSA enrichment
  21. 2026-08-18 13:49 UTCEPSS rescore
  22. 2026-08-18 13:49 UTCEPSS rescore
  23. 2026-08-18 13:08 UTCGHSA enrichment
  24. 2026-08-18 08:44 UTCGHSA enrichment
  25. 2026-08-18 04:21 UTCGHSA enrichment
Show 21 more
  1. 2026-08-17 23:58 UTCGHSA enrichment
  2. 2026-08-17 19:35 UTCGHSA enrichment
  3. 2026-08-17 15:12 UTCEG score recompute
  4. 2026-08-17 15:12 UTCGHSA enrichment
  5. 2026-08-17 13:47 UTCEPSS rescore
  6. 2026-08-17 10:48 UTCEG score recompute
  7. 2026-08-17 10:48 UTCGHSA enrichment
  8. 2026-08-17 06:25 UTCEG score recompute
  9. 2026-08-17 06:25 UTCGHSA enrichment
  10. 2026-08-17 05:55 UTCEG score recompute▲ 9.80
  11. 2026-08-17 05:55 UTCGHSA enrichment
  12. 2026-08-17 05:54 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  13. 2026-08-17 05:25 UTCEG score recompute
  14. 2026-08-17 05:25 UTCGHSA enrichment
  15. 2026-08-17 05:24 UTCMITRE cvelistV5
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 02:15 UTCEPSS rescore
  19. 2026-08-15 06:23 UTCNVD update
  20. 2026-08-15 06:13 UTCEG score recompute
  21. 2026-08-15 06:12 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-74436?
CVE-2026-74436 is a critical vulnerability published on August 15, 2026. In the Linux kernel, the following vulnerability has been resolved: rxrpc: serialize kernel accept preallocation with socket teardown rxrpckernelcharge_accept() reads rx->backlog without any socket/backlog synchronization and passes that raw pointer into rxrpcservicepreallocone(). A concurrent…
When was CVE-2026-74436 disclosed?
CVE-2026-74436 was first published in the National Vulnerability Database on August 15, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74436 actively exploited?
CVE-2026-74436 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 70.3% of all scored CVEs.
What is the CVSS score of CVE-2026-74436?
CVE-2026-74436 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-74436?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74436, 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-2026-74436

Explore →

Is Your Infrastructure Affected by CVE-2026-74436?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs