VulnerabilityPublished 27 Jul 2026Updated 17 Aug 2026

CVE-2026-64553: Linux kernel · net: psample: fix info leak in PSAMPLE_ATTR_DATA

Affects Linux kernelSource GCVE Database

Compare

Not known to be exploited.

Data as of 3 Nov 2026, 18:31 UTC

Severity

Low

Rated Low by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation evidence

Disclosed: evidence found.
CVE published 27 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

AI-suggested

A fix has been implemented in the Linux kernel to properly clear padding bytes in the psample netlink attributes, eliminating the information leak. Users should update to the fixed kernel version once available to remediate this vulnerability.

Description

A vulnerability in the Linux kernel's psample module caused an information leak due to improper clearing of padding bytes in netlink attributes. The issue arose because the code used nla_put() without clearing padding bytes, which are required to align data to 4-byte boundaries, potentially exposing residual kernel memory data.

Impact

The vulnerability could allow an attacker with access to the psample netlink interface to obtain unintended kernel memory contents due to uninitialized padding bytes in netlink attributes. This constitutes an information leak, potentially exposing sensitive data from kernel memory. No evidence of exploitation in the wild is reported.

Summary

CVE-2026-64553 addresses an information leak vulnerability in the Linux kernel's psample module. The vulnerability stems from the open-coded use of nla_put() to insert packet data into netlink attributes without clearing the padding bytes. Since netlink attributes are padded to 4 bytes and the data length may not be divisible by 4, the padding bytes could contain leftover kernel memory, leading to an info leak. This flaw has been resolved in the Linux kernel.

References

Community reviews

Loading reviews…

Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 3 Nov 2026, 18:31 UTC

Technical details

References

Community reviews

Related threats