CVE-2026-45870

Local service interruption via XDR memory leaks

Published May 27, 2026 · Updated May 27, 2026

Memory leak in Linux Kernel allows local users to exhaust kernel memory by triggering SUNRPC auth_gss XDR decoding errors. In gssx_dec_ctx(), gssx_dec_status(), and gssx_dec_name(), gssx_dec_buffer() allocates with kmemdup(), but later decode failures return without releasing earlier buffers. Local low-privileged access is required, and repeated failures can leave allocations unreachable until kernel memory exhaustion interrupts service.

CVSS severity5.5
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in Linux Kernel allows local users to exhaust kernel memory by triggering SUNRPC auth_gss XDR decoding errors. In gssx_dec_ctx(), gssx_dec_status(), and gssx_dec_name(), gssx_dec_buffer() allocates with kmemdup(), but later decode failures return without releasing earlier buffers. Local low-privileged access is required, and repeated failures can leave allocations unreachable until kernel memory exhaustion interrupts service.

The record

CVE
CVE-2026-45870
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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=1d658336b05f8697d6445834f8867f8ad5e4f735 <3b56eb90feb8a3709417f5624f3871847d42bcb1
  2. Affected versionversion=1d658336b05f8697d6445834f8867f8ad5e4f735 <3e6397b056335cc56ef0e9da36c95946a19f5118
  3. Affected versionversion=1d658336b05f8697d6445834f8867f8ad5e4f735 <64303b92d94c0c7845a273acd8d84b796d6f1db7
  4. Affected versionversion=1d658336b05f8697d6445834f8867f8ad5e4f735 <b4af3806846778799cd4ab0766dc18341e777264
  5. Affected versionversion=1d658336b05f8697d6445834f8867f8ad5e4f735 <c81431b1b9fbd21e9a5a9211b5517b7295d18e6a
  6. Affected versionversion=1d658336b05f8697d6445834f8867f8ad5e4f735 <caf7eff432e91a9eba1c79fa545c2f54be15d62b
  7. Affected versionversion=1d658336b05f8697d6445834f8867f8ad5e4f735 <d79b9097a6a2b91471b40755f1225364be5d85ff
  8. Affected versionversion=1d658336b05f8697d6445834f8867f8ad5e4f735 <df10f23defff22c8d55fe6db74f6e4ce927145bf
  9. Affected versionversion=3.10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1d658336b05f8697d6445834f8867f8ad5e4f735 <3b56eb90feb8a3709417f5624f3871847d42bcb1; version=1d658336b05f8697d6445834f8867f8ad5e4f735 <3e6397b056335cc56ef0e9da36c95946a19f5118; version=1d658336b05f8697d6445834f8867f8ad5e4f735 <64303b92d94c0c7845a273acd8d84b796d6f1db7; version=1d658336b05f8697d6445834f8867f8ad5e4f735 <b4af3806846778799cd4ab0766dc18341e777264; version=1d658336b05f8697d6445834f8867f8ad5e4f735 <c81431b1b9fbd21e9a5a9211b5517b7295d18e6a; version=1d658336b05f8697d6445834f8867f8ad5e4f735 <caf7eff432e91a9eba1c79fa545c2f54be15d62b; version=1d658336b05f8697d6445834f8867f8ad5e4f735 <d79b9097a6a2b91471b40755f1225364be5d85ff; version=1d658336b05f8697d6445834f8867f8ad5e4f735 <df10f23defff22c8d55fe6db74f6e4ce927145bf; version=3.10

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
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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