CVE-2026-53077Public exploit

Local privilege escalation via RDS/IB use-after-free

Published Jun 24, 2026 · Updated Jun 24, 2026

A use-after-free in Linux Kernel RDS/IB allows local users to gain kernel-level control through noninitial namespace teardown. RDS/IB connections retain a network-namespace pointer after the noninitial namespace is freed, and later check_net() access dereferences the stale pointer. Exploitation requires low-privileged local syscall access to create and tear down a user/network namespace and manipulate RDS/IB sockets; a remote peer alone cannot trigger it.

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 use-after-free in Linux Kernel RDS/IB allows local users to gain kernel-level control through noninitial namespace teardown. RDS/IB connections retain a network-namespace pointer after the noninitial namespace is freed, and later check_net() access dereferences the stale pointer. Exploitation requires low-privileged local syscall access to create and tear down a user/network namespace and manipulate RDS/IB sockets; a remote peer alone cannot trigger it.

The record

CVE
CVE-2026-53077
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 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=4.3
  2. Affected versionversion=d5a8ac28a7ff2f250d1bedbb6008dd2f6f6f1638 <07035306bf722f4676a1aee35cbeb3732c76194e
  3. Affected versionversion=d5a8ac28a7ff2f250d1bedbb6008dd2f6f6f1638 <3174fc703d081d2ca538b22fba734e3ad5b52322
  4. Affected versionversion=d5a8ac28a7ff2f250d1bedbb6008dd2f6f6f1638 <3e7f14cd5a51533404e1ae4809caab46073fb5c7
  5. Affected versionversion=d5a8ac28a7ff2f250d1bedbb6008dd2f6f6f1638 <a7494479757d60d2413bfaa087f8431a26eea032
  6. Affected versionversion=d5a8ac28a7ff2f250d1bedbb6008dd2f6f6f1638 <b6a54f5e9ce9b97ae641855378d71c5154a085c0
  7. Affected versionversion=d5a8ac28a7ff2f250d1bedbb6008dd2f6f6f1638 <c244b79adffad89a5173cf8bfaa06a6b40bbd09b
  8. Affected versionversion=d5a8ac28a7ff2f250d1bedbb6008dd2f6f6f1638 <ebf71dd4aff46e8e421d455db3e231ba43d2fa8a
  9. Affected versionversion=d5a8ac28a7ff2f250d1bedbb6008dd2f6f6f1638 <fb407343c0c16e94584707b2dfdd350a5f81b000

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.3; version=d5a8ac28a7ff2f250d1bedbb6008dd2f6f6f1638 <07035306bf722f4676a1aee35cbeb3732c76194e; version=d5a8ac28a7ff2f250d1bedbb6008dd2f6f6f1638 <3174fc703d081d2ca538b22fba734e3ad5b52322; version=d5a8ac28a7ff2f250d1bedbb6008dd2f6f6f1638 <3e7f14cd5a51533404e1ae4809caab46073fb5c7; version=d5a8ac28a7ff2f250d1bedbb6008dd2f6f6f1638 <a7494479757d60d2413bfaa087f8431a26eea032; version=d5a8ac28a7ff2f250d1bedbb6008dd2f6f6f1638 <b6a54f5e9ce9b97ae641855378d71c5154a085c0; version=d5a8ac28a7ff2f250d1bedbb6008dd2f6f6f1638 <c244b79adffad89a5173cf8bfaa06a6b40bbd09b; version=d5a8ac28a7ff2f250d1bedbb6008dd2f6f6f1638 <ebf71dd4aff46e8e421d455db3e231ba43d2fa8a; version=d5a8ac28a7ff2f250d1bedbb6008dd2f6f6f1638 <fb407343c0c16e94584707b2dfdd350a5f81b000

Published CVSS scores

7.8kernel.orgCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 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.

Technologies

Your stack

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Your stack

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