CVE-2026-52930

Service interruption via shared-memory orphan cleanup race

Published Jun 24, 2026 · Updated Jun 24, 2026

Race condition in affected Linux Kernel releases allows local users to interrupt service by racing shared-memory orphan cleanup. The shm_destroy_orphaned() path tests shm_nattch without shm_perm.lock even though attach paths update that field under the object lock, allowing an in-use segment to be mistaken for an unused orphan and destroyed. Exploitation requires local access and a successful timing race between a shared-memory attach and orphan cleanup; the bounded reported consequence is loss of availability.

CVSS severity5.5
Medium
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

Race condition in affected Linux Kernel releases allows local users to interrupt service by racing shared-memory orphan cleanup. The shm_destroy_orphaned() path tests shm_nattch without shm_perm.lock even though attach paths update that field under the object lock, allowing an in-use segment to be mistaken for an unused orphan and destroyed. Exploitation requires local access and a successful timing race between a shared-memory attach and orphan cleanup; the bounded reported consequence is loss of availability.

The record

CVE
CVE-2026-52930
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

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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=3.1
  2. Affected versionversion=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <030bbc857bd51d4b25a90d931d3f8775ef22823a
  3. Affected versionversion=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <1f0d01e35dbb228084d5187212e32c91a30dcbeb
  4. Affected versionversion=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <2e5c6f4fd4001562781e99bbfc7f1f0127187542
  5. Affected versionversion=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <6560be3f6a5bb84f006f184f0c966747bb58e1a3
  6. Affected versionversion=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <92cda2593cf2ed25b0e9d78e5e6d8303bba1a064
  7. Affected versionversion=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <b1e9aef48e4d8a0c1b54fb913077b0824ed7d650
  8. Affected versionversion=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <b5107b4ce3ad45fcf369ee2058c8910620f4b5a8
  9. Affected versionversion=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <db752ebfdaf2c7f27cd9690ef48b616af068319c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.1; version=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <030bbc857bd51d4b25a90d931d3f8775ef22823a; version=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <1f0d01e35dbb228084d5187212e32c91a30dcbeb; version=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <2e5c6f4fd4001562781e99bbfc7f1f0127187542; version=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <6560be3f6a5bb84f006f184f0c966747bb58e1a3; version=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <92cda2593cf2ed25b0e9d78e5e6d8303bba1a064; version=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <b1e9aef48e4d8a0c1b54fb913077b0824ed7d650; version=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <b5107b4ce3ad45fcf369ee2058c8910620f4b5a8; version=4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d <db752ebfdaf2c7f27cd9690ef48b616af068319c

Published CVSS scores

5.5NIST NVDCVSS: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.

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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

T1499Endpoint Denial of Service

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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