CVE-2026-89530Network attack vectorHinoki check available

Kernel memory corruption via oversized inline reply

Published Sep 11, 2026 · Updated Sep 11, 2026

Out-of-bounds write in svcrdma in affected Linux kernel revisions allows remote attackers to corrupt kernel memory via crafted NFS READ requests. The SGE-exhaustion path linearizes an unchecked inline RPC-over-RDMA reply into the smaller sc_xprt_buf, copying beyond its end and posting an oversized mapped length. Reachability requires an RPC-over-RDMA server reply with no Write list or Reply chunk that exceeds the device's scatter/gather-entry budget.

CVSS severityUnavailable
Unscored
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds write in svcrdma in affected Linux kernel revisions allows remote attackers to corrupt kernel memory via crafted NFS READ requests. The SGE-exhaustion path linearizes an unchecked inline RPC-over-RDMA reply into the smaller sc_xprt_buf, copying beyond its end and posting an oversized mapped length. Reachability requires an RPC-over-RDMA server reply with no Write list or Reply chunk that exceeds the device's scatter/gather-entry budget.

The record

CVE
CVE-2026-89530
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.19.22 <4.20
  2. Affected versionversion=4.20.9 <4.21
  3. Affected versionversion=5.0
  4. Affected versionversion=9b65b18f817d9ada2bf67351f24bdcce6789a0bb
  5. Affected versionversion=d564356e1919d1178568c19af410cfc1a9076663
  6. Affected versionversion=e248aa7be86e8179f20ac0931774ecd746f3f5bf <0fbe20dfe74b783d255bf389a6ea77aa25dc7860
  7. Affected versionversion=e248aa7be86e8179f20ac0931774ecd746f3f5bf <1949dd1576f7a8aa161b1330c6125df9d53046d5
  8. Affected versionversion=e248aa7be86e8179f20ac0931774ecd746f3f5bf <8ec60eb51fae37cd3d334ff26e4a7d6fb21ff7cf
  9. Affected versionversion=e248aa7be86e8179f20ac0931774ecd746f3f5bf <fcd91b9957462d398792201c239dffaeff1cc8b2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.19.22 <4.20; version=4.20.9 <4.21; version=5.0; version=9b65b18f817d9ada2bf67351f24bdcce6789a0bb; version=d564356e1919d1178568c19af410cfc1a9076663; version=e248aa7be86e8179f20ac0931774ecd746f3f5bf <0fbe20dfe74b783d255bf389a6ea77aa25dc7860; version=e248aa7be86e8179f20ac0931774ecd746f3f5bf <1949dd1576f7a8aa161b1330c6125df9d53046d5; version=e248aa7be86e8179f20ac0931774ecd746f3f5bf <8ec60eb51fae37cd3d334ff26e4a7d6fb21ff7cf; version=e248aa7be86e8179f20ac0931774ecd746f3f5bf <fcd91b9957462d398792201c239dffaeff1cc8b2

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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