CVE-2026-89784Hinoki check available

Kernel crash via unchecked SUNRPC allocation failure

Published Sep 16, 2026 · Updated Sep 16, 2026

NULL pointer dereference in the Linux SUNRPC client allows attackers to crash the kernel during local rpcbind registration. The IPv4 and IPv6 registration helpers pass a NULL result from rpc_sockaddr2uaddr() into encode_rpcb_string(), which calls strlen() on it. Reachability requires an in-kernel RPC service such as nfsd, lockd, or nfs-callback to register while memory pressure makes the GFP_KERNEL allocation fail.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

NULL pointer dereference in the Linux SUNRPC client allows attackers to crash the kernel during local rpcbind registration. The IPv4 and IPv6 registration helpers pass a NULL result from rpc_sockaddr2uaddr() into encode_rpcb_string(), which calls strlen() on it. Reachability requires an in-kernel RPC service such as nfsd, lockd, or nfs-callback to register while memory pressure makes the GFP_KERNEL allocation fail.

The record

CVE
CVE-2026-89784
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=3.2
  2. Affected versionversion=d77385f23830ee6c400569bac8b37e6eb3b7d360 <04441b792ec40eb66349b5fab34b6a2090b5b2dd
  3. Affected versionversion=d77385f23830ee6c400569bac8b37e6eb3b7d360 <12bf3e0182ccdaf3b412756a756d3944a7dacaa9
  4. Affected versionversion=d77385f23830ee6c400569bac8b37e6eb3b7d360 <4a6095de8cb1858e05bdf70b3e7d6d7645c25041
  5. Affected versionversion=d77385f23830ee6c400569bac8b37e6eb3b7d360 <4e01022974355732e748ec8ebc97c558cb624ffe
  6. Affected versionversion=d77385f23830ee6c400569bac8b37e6eb3b7d360 <5a51c49ddb37b883566874aecc66bc5a2e617a96
  7. Affected versionversion=d77385f23830ee6c400569bac8b37e6eb3b7d360 <cda4aacfb0bbf5c0f90fd0b42c72c749635d1368
  8. Affected versionversion=d77385f23830ee6c400569bac8b37e6eb3b7d360 <eb476289c12cc22c8766f8a84eeb7ab46c4e8fb6
  9. Affected versionversion=d77385f23830ee6c400569bac8b37e6eb3b7d360 <fd22370226a0d8109045d0831fd5aaadee921693

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3.2; version=d77385f23830ee6c400569bac8b37e6eb3b7d360 <04441b792ec40eb66349b5fab34b6a2090b5b2dd; version=d77385f23830ee6c400569bac8b37e6eb3b7d360 <12bf3e0182ccdaf3b412756a756d3944a7dacaa9; version=d77385f23830ee6c400569bac8b37e6eb3b7d360 <4a6095de8cb1858e05bdf70b3e7d6d7645c25041; version=d77385f23830ee6c400569bac8b37e6eb3b7d360 <4e01022974355732e748ec8ebc97c558cb624ffe; version=d77385f23830ee6c400569bac8b37e6eb3b7d360 <5a51c49ddb37b883566874aecc66bc5a2e617a96; version=d77385f23830ee6c400569bac8b37e6eb3b7d360 <cda4aacfb0bbf5c0f90fd0b42c72c749635d1368; version=d77385f23830ee6c400569bac8b37e6eb3b7d360 <eb476289c12cc22c8766f8a84eeb7ab46c4e8fb6; version=d77385f23830ee6c400569bac8b37e6eb3b7d360 <fd22370226a0d8109045d0831fd5aaadee921693

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.

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No observations available

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

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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