CVE-2026-53083

Service interruption via non-yielding BPF map clear

Published Jun 24, 2026 · Updated Jun 24, 2026

An RCU stall in the BPF map-clear path in Linux Kernel allows local users to interrupt service via a large PROG_ARRAY map. The bpf_fd_array_map_clear() loop invokes expensive prog_array_map_poke_run() work for every entry without calling cond_resched(), so the deferred worker can monopolize a CPU and stall RCU grace-period progress under load. Exploitation requires low-privileged local access and a PROG_ARRAY with many entries; the documented consequence is availability loss rather than data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

An RCU stall in the BPF map-clear path in Linux Kernel allows local users to interrupt service via a large PROG_ARRAY map. The bpf_fd_array_map_clear() loop invokes expensive prog_array_map_poke_run() work for every entry without calling cond_resched(), so the deferred worker can monopolize a CPU and stall RCU grace-period progress under load. Exploitation requires low-privileged local access and a PROG_ARRAY with many entries; the documented consequence is availability loss rather than data disclosure or modification.

The record

CVE
CVE-2026-53083
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
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=5.5
  2. Affected versionversion=da765a2f599304a81a25e77908d1790414ecdbb6 <4406942e65ca128c56c67443832988873c21d2e9
  3. Affected versionversion=da765a2f599304a81a25e77908d1790414ecdbb6 <67bdb4b0d26f2d6bbf1798a925ef5a3b9ed7357a
  4. Affected versionversion=da765a2f599304a81a25e77908d1790414ecdbb6 <71ddb7defc442ab38c53123c384fedbfd8410a15
  5. Affected versionversion=da765a2f599304a81a25e77908d1790414ecdbb6 <b1f7158a86f3cbac4d5a32beb55ca0f8027d44cd
  6. Affected versionversion=da765a2f599304a81a25e77908d1790414ecdbb6 <e1ed678855e315f90c70c1723e94157a9a82e660

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.5; version=da765a2f599304a81a25e77908d1790414ecdbb6 <4406942e65ca128c56c67443832988873c21d2e9; version=da765a2f599304a81a25e77908d1790414ecdbb6 <67bdb4b0d26f2d6bbf1798a925ef5a3b9ed7357a; version=da765a2f599304a81a25e77908d1790414ecdbb6 <71ddb7defc442ab38c53123c384fedbfd8410a15; version=da765a2f599304a81a25e77908d1790414ecdbb6 <b1f7158a86f3cbac4d5a32beb55ca0f8027d44cd; version=da765a2f599304a81a25e77908d1790414ecdbb6 <e1ed678855e315f90c70c1723e94157a9a82e660

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/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.

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 exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo