CVE-2026-13087

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-22. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: Elevated riskExposed: 0

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

A heap out-of-bounds write vulnerability was found in the Linux kernel's RPC-over-RDMA server reply path in net/sunrpc/xprtrdma/svc_rdma_sendto.c. When a crafted RPC-over-RDMA client sends a large NFS READ request with an empty Write list and no Reply chunk, the server linearizes the entire multi-page reply into a fixed-size 4096-byte heap buffer without bounds checking, resulting in a kernel heap overflow. This can lead to denial of service via kernel crash or potential code execution through corruption of adjacent kernel heap objects.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
56(Track*)
EG Risk 56/100SSVC: 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
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

September 22, 2026

Last Modified

September 22, 2026

Advisory Details (2)

Auto-updated Sep 22, 2026
Patch available. Sources: redhat.
redhat

2470788 – (CVE-2026-13087) CVE-2026-13087 kernel: Heap out-of-bounds write in the Linux kernel RPC-over-RDMA server reply path...

https://bugzilla.redhat.com/show_bug.cgi?id=2470788
redhat Patch Available

CVE-2026-13087 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-13087

Vendor Advisories for CVE-2026-13087(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 14× in last 7d / 14× 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. 2026-09-24 23:35 UTCEG score recompute
  2. 2026-09-24 23:35 UTCGHSA enrichment
  3. 2026-09-24 10:38 UTCGHSA enrichment
  4. 2026-09-23 21:42 UTCEG score recompute
  5. 2026-09-23 21:42 UTCGHSA enrichment
  6. 2026-09-23 13:47 UTCEPSS rescore
  7. 2026-09-23 08:47 UTCGHSA enrichment
  8. 2026-09-22 19:51 UTCEG score recompute
  9. 2026-09-22 19:51 UTCGHSA enrichment
  10. 2026-09-22 18:32 UTCEG score recompute
  11. 2026-09-22 18:08 UTCEG score recompute
  12. 2026-09-22 17:34 UTCEG score recompute
  13. 2026-09-22 17:01 UTCEG score recompute
  14. 2026-09-22 16:59 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-13087?
CVE-2026-13087 is a high vulnerability published on September 22, 2026. A heap out-of-bounds write vulnerability was found in the Linux kernel's RPC-over-RDMA server reply path in net/sunrpc/xprtrdma/svcrdmasendto.c. When a crafted RPC-over-RDMA client sends a large NFS READ request with an empty Write list and no Reply chunk, the server linearizes the entire…
When was CVE-2026-13087 disclosed?
CVE-2026-13087 was first published in the National Vulnerability Database on September 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-13087 actively exploited?
CVE-2026-13087 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 62.0% of all scored CVEs.
What is the CVSS score of CVE-2026-13087?
CVE-2026-13087 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-13087?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13087, 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

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