CVE-2026-64580

Kernel-state corruption via double device-reference release

Published Aug 5, 2026 · Updated Aug 5, 2026

A double reference release in the Linux kernel allows local users to corrupt kernel state through an IPv6 XFRM error path. When in6_dev_get() fails, xfrm6_fill_dst() calls netdev_put() but leaves xdst->u.dst.dev set, causing dst_destroy() to release the same reference again. Reaching the fault requires local low-privilege access and the error condition; observed consequences include refcount warnings and a device-teardown hang.

CVSS severity7.8
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

A double reference release in the Linux kernel allows local users to corrupt kernel state through an IPv6 XFRM error path. When in6_dev_get() fails, xfrm6_fill_dst() calls netdev_put() but leaves xdst->u.dst.dev set, causing dst_destroy() to release the same reference again. Reaching the fault requires local low-privilege access and the error condition; observed consequences include refcount warnings and a device-teardown hang.

The record

CVE
CVE-2026-64580
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
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=01b0d887f67a388fb2a658ee2bdd74e5ba146818
  2. Affected versionversion=3.0.79 <3.1
  3. Affected versionversion=3.10
  4. Affected versionversion=3.2.46 <3.3
  5. Affected versionversion=3.4.46 <3.5
  6. Affected versionversion=3.9.3 <3.10
  7. Affected versionversion=84c4a9dfbf430861e7588d95ae3ff61535dca351 <136992de9bb91871084ae52d172610541c76e4d2
  8. Affected versionversion=84c4a9dfbf430861e7588d95ae3ff61535dca351 <43de8a49335e611adb271bbd52e84dfbc11fc185
  9. Affected versionversion=84c4a9dfbf430861e7588d95ae3ff61535dca351 <df6856c2dda9187601d29b5fbd7a81b3b178cedf
  10. Affected versionversion=84c4a9dfbf430861e7588d95ae3ff61535dca351 <e078da1b4e11390cff3201c19a9a1fe70c5b934f
  11. Affected versionversion=84c4a9dfbf430861e7588d95ae3ff61535dca351 <ff636d7b7cba6dea82ecf580415ea57f2c1a11b6
  12. Affected versionversion=a7e22d0c0e81dde129a51ee413644124f4b59954
  13. Affected versionversion=a98124aac0b5adc5de8ae54f11322781cb4d85c3
  14. Affected versionversion=e27b7bee743d921f037b1da6f071237345bef7c1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=01b0d887f67a388fb2a658ee2bdd74e5ba146818; version=3.0.79 <3.1; version=3.10; version=3.2.46 <3.3; version=3.4.46 <3.5; version=3.9.3 <3.10; version=84c4a9dfbf430861e7588d95ae3ff61535dca351 <136992de9bb91871084ae52d172610541c76e4d2; version=84c4a9dfbf430861e7588d95ae3ff61535dca351 <43de8a49335e611adb271bbd52e84dfbc11fc185; version=84c4a9dfbf430861e7588d95ae3ff61535dca351 <df6856c2dda9187601d29b5fbd7a81b3b178cedf; version=84c4a9dfbf430861e7588d95ae3ff61535dca351 <e078da1b4e11390cff3201c19a9a1fe70c5b934f; version=84c4a9dfbf430861e7588d95ae3ff61535dca351 <ff636d7b7cba6dea82ecf580415ea57f2c1a11b6; version=a7e22d0c0e81dde129a51ee413644124f4b59954; version=a98124aac0b5adc5de8ae54f11322781cb4d85c3; version=e27b7bee743d921f037b1da6f071237345bef7c1

Published CVSS scores

7.8Linux kernel CVE teamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.7Oracle LinuxCVSS:3.1/AV:L/AC:H/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

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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