CVE-2026-64553

Kernel memory disclosure via uncleared Netlink padding

Published Jul 27, 2026 · Updated Jul 27, 2026

Information disclosure in the psample subsystem of Linux Kernel allows local users to read kernel memory bytes through Netlink messages. In net/psample/psample.c, the PSAMPLE_ATTR_DATA builder open-codes nla_put(), copies packet data, and leaves four-byte alignment padding uncleared. A low-privileged local user must receive psample multicast traffic whose sampled data length is not divisible by four; each qualifying attribute exposes one to three padding bytes.

CVSS severity3.3
Low
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the psample subsystem of Linux Kernel allows local users to read kernel memory bytes through Netlink messages. In net/psample/psample.c, the PSAMPLE_ATTR_DATA builder open-codes nla_put(), copies packet data, and leaves four-byte alignment padding uncleared. A low-privileged local user must receive psample multicast traffic whose sampled data length is not divisible by four; each qualifying attribute exposes one to three padding bytes.

The record

CVE
CVE-2026-64553
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.11
  2. Affected versionversion=6ae0a6286171154661b74f7f550f9441c6008424 <0d3ea2ccddda442077fc44f11d873209c97ec50b
  3. Affected versionversion=6ae0a6286171154661b74f7f550f9441c6008424 <48930f6c59fd0056c2de46ce52bfe27d9c9e5eb6
  4. Affected versionversion=6ae0a6286171154661b74f7f550f9441c6008424 <794a0d8bdbb39e083ed42caccb86d687a9b53570
  5. Affected versionversion=6ae0a6286171154661b74f7f550f9441c6008424 <7fe7e6949964aa8ee6305f09db2dc9eede977bb3
  6. Affected versionversion=6ae0a6286171154661b74f7f550f9441c6008424 <a6cfb924ad74efce254e99c197d2e3863de70868
  7. Affected versionversion=6ae0a6286171154661b74f7f550f9441c6008424 <aedd02af1f8b0bceb7f42f5a21c41634ca9ed390
  8. Affected versionversion=6ae0a6286171154661b74f7f550f9441c6008424 <befe1ebe7fc2c65c80074bc34ceeb0a721ed3cd2
  9. Affected versionversion=6ae0a6286171154661b74f7f550f9441c6008424 <e2fa322782a2d7d8078f7bb20817e0aa9f7c32e9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.11; version=6ae0a6286171154661b74f7f550f9441c6008424 <0d3ea2ccddda442077fc44f11d873209c97ec50b; version=6ae0a6286171154661b74f7f550f9441c6008424 <48930f6c59fd0056c2de46ce52bfe27d9c9e5eb6; version=6ae0a6286171154661b74f7f550f9441c6008424 <794a0d8bdbb39e083ed42caccb86d687a9b53570; version=6ae0a6286171154661b74f7f550f9441c6008424 <7fe7e6949964aa8ee6305f09db2dc9eede977bb3; version=6ae0a6286171154661b74f7f550f9441c6008424 <a6cfb924ad74efce254e99c197d2e3863de70868; version=6ae0a6286171154661b74f7f550f9441c6008424 <aedd02af1f8b0bceb7f42f5a21c41634ca9ed390; version=6ae0a6286171154661b74f7f550f9441c6008424 <befe1ebe7fc2c65c80074bc34ceeb0a721ed3cd2; version=6ae0a6286171154661b74f7f550f9441c6008424 <e2fa322782a2d7d8078f7bb20817e0aa9f7c32e9

Published CVSS scores

3.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1005Data from Local System

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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