CVE-2026-53362Known exploitationPublic exploit

Local privilege escalation via IPv6 buffer overflow

Published Jul 4, 2026 · Updated Aug 28, 2026

Heap buffer overflow in affected Linux kernels allows local users to gain kernel privileges through crafted UDPv6 socket operations. __ip6_append_data() omits fraggap from the paged allocation's linear size while counting those bytes as paged data, so their copy overruns skb->end into skb_shared_info. Triggering requires an unprivileged local process, IPv6 support, and a UDPv6 send sequence using MSG_MORE with MSG_SPLICE_PAGES; successful exploitation grants root-level control.

CVSS severity7.8
High
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in affected Linux kernels allows local users to gain kernel privileges through crafted UDPv6 socket operations. __ip6_append_data() omits fraggap from the paged allocation's linear size while counting those bytes as paged data, so their copy overruns skb->end into skb_shared_info. Triggering requires an unprivileged local process, IPv6 support, and a UDPv6 send sequence using MSG_MORE with MSG_SPLICE_PAGES; successful exploitation grants root-level control.

The record

CVE
CVE-2026-53362
Published
Jul 4, 2026
Updated
Aug 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2026Exploitation reportedCISA Known Exploited Vulnerabilities Catalog listing
  3. Aug 28, 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=6.0
  2. Affected versionversion=773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 <14200d435af9a9eeb444f529fc2f689a236b7962
  3. Affected versionversion=773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 <46f201f8b4c39633a1fa3dc12459f506d470993d
  4. Affected versionversion=773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 <6374fb9edf72c67a118a2c214a0dddd04c921e0a
  5. Affected versionversion=773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 <65fb14cbebb0cd0eff903a22d33537ddc8b95769
  6. Affected versionversion=773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 <736b380e28d0480c7bc3e022f1950f31fe53a7c5
  7. Affected versionversion=773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 <e9eacf19281ea2498b36291b56c9606118c2d74e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.0; version=773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 <14200d435af9a9eeb444f529fc2f689a236b7962; version=773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 <46f201f8b4c39633a1fa3dc12459f506d470993d; version=773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 <6374fb9edf72c67a118a2c214a0dddd04c921e0a; version=773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 <65fb14cbebb0cd0eff903a22d33537ddc8b95769; version=773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 <736b380e28d0480c7bc3e022f1950f31fe53a7c5; version=773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 <e9eacf19281ea2498b36291b56c9606118c2d74e

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 exploitationReported
Public exploitPublished

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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