CVE-2026-64576

Kernel-memory disclosure and panic via uninitialized extack

Published Aug 5, 2026 · Updated Aug 5, 2026

Access of uninitialized memory in Linux kernel nexthop handling allows local users to read kernel memory or panic the host. nh_res_bucket_migrate() passes an uninitialized netlink_ext_ack through a notifier failure, then pr_err_ratelimited() treats its stale _msg pointer as a string. Reachability requires local rtnetlink access, a resilient nexthop group, a registered notifier, CONFIG_INIT_STACK_NONE, and a failed allocation; the bounded effects are kernel-log disclosure and a host panic.

CVSS severity7.1
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Access of uninitialized memory in Linux kernel nexthop handling allows local users to read kernel memory or panic the host. nh_res_bucket_migrate() passes an uninitialized netlink_ext_ack through a notifier failure, then pr_err_ratelimited() treats its stale _msg pointer as a string. Reachability requires local rtnetlink access, a resilient nexthop group, a registered notifier, CONFIG_INIT_STACK_NONE, and a failed allocation; the bounded effects are kernel-log disclosure and a host panic.

The record

CVE
CVE-2026-64576
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-824, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.13
  2. Affected versionversion=7c37c7e00411b3d1e0c5292368317aca69d1f324 <18506d7263768d76ac8e057ba55a4d9da50aad66
  3. Affected versionversion=7c37c7e00411b3d1e0c5292368317aca69d1f324 <3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d
  4. Affected versionversion=7c37c7e00411b3d1e0c5292368317aca69d1f324 <6347c5314cee49f364aaf2e40ff15415a57a116e
  5. Affected versionversion=7c37c7e00411b3d1e0c5292368317aca69d1f324 <c0936c131a71657afc635d0db2ab096d15d473e1
  6. Affected versionversion=7c37c7e00411b3d1e0c5292368317aca69d1f324 <d536bf205c71f700f6de2086038c3e1d77724715

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.13; version=7c37c7e00411b3d1e0c5292368317aca69d1f324 <18506d7263768d76ac8e057ba55a4d9da50aad66; version=7c37c7e00411b3d1e0c5292368317aca69d1f324 <3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d; version=7c37c7e00411b3d1e0c5292368317aca69d1f324 <6347c5314cee49f364aaf2e40ff15415a57a116e; version=7c37c7e00411b3d1e0c5292368317aca69d1f324 <c0936c131a71657afc635d0db2ab096d15d473e1; version=7c37c7e00411b3d1e0c5292368317aca69d1f324 <d536bf205c71f700f6de2086038c3e1d77724715

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1Linux kernel CVE teamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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-824Access of Uninitialized Pointer
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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