NVD / CVE Program· CNA Linux

CVE-2026-52930: ipc/shm: serialize orphan cleanup with shm_nattch updates

Noroxi assessment

Priority: Monitor (action score 22/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 030bbc857bd51d4b25a90d931d3f8775ef22823a, 1f0d01e35dbb228084d5187212e32c91a30dcbeb, 2e5c6f4fd4001562781e99bbfc7f1f0127187542; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 030bbc857bd51d4b25a90d931d3f8775ef22823a, 1f0d01e35dbb228084d5187212e32c91a30dcbeb, 2e5c6f4fd4001562781e99bbfc7f1f0127187542; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: ipc/shm: serialize orphan cleanup with shm_nattch updates shm_destroy_orphaned() walks the shm idr under shm_ids(ns).rwsem, but that does not serialize all fields tested by shm_may_destroy(). In particular, shm_nattch is updated while holding shm_perm.lock, and attach paths can do that without holding the rwsem. Do not decide that an orphaned segment is unused before taking the object lock. Move the shm_may_destroy() check under shm_perm.lock, matching the other destroy paths, and unlock the segment when it no longer qualifies for removal.

MediumCVSS 5.5 · v3.1—No exploit Fix available

Denial of service

BDU:2026-13906

Published: Jun 24, 2026
Updated: Nov 10, 2026
EPSS: 0.1% · 1th percentile
CWE: —

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 22 / 40 · 5.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linux linux kernel3.1 and later · before 5.10.259
linux linux kernel5.11 and later · before 5.15.210
linux linux kernel5.16 and later · before 6.1.176
linux linux kernel6.2 and later · before 6.6.143
linux linux kernel6.7 and later · before 6.12.94
linux linux kernel6.13 and later · before 6.18.36
linux linux kernel6.19 and later · before 7.0.13
linux linux kernel7.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

Linux Linux
- 3.1affected
- 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d and later · before b1e9aef48e4d8a0c1b54fb913077b0824ed7d650affected · git
- 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d and later · before 92cda2593cf2ed25b0e9d78e5e6d8303bba1a064affected · git
- 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d and later · before 1f0d01e35dbb228084d5187212e32c91a30dcbebaffected · git
- 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d and later · before 6560be3f6a5bb84f006f184f0c966747bb58e1a3affected · git
- 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d and later · before b5107b4ce3ad45fcf369ee2058c8910620f4b5a8affected · git
- 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d and later · before db752ebfdaf2c7f27cd9690ef48b616af068319caffected · git
- 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d and later · before 030bbc857bd51d4b25a90d931d3f8775ef22823aaffected · git
- 4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d and later · before 2e5c6f4fd4001562781e99bbfc7f1f0127187542affected · git
- before 3.1not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.1.176-1	6.1.176-1
Debian:13	linux	before 6.12.94-1	6.12.94-1
Debian:14	linux	before 7.0.13-1	7.0.13-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
90Now
CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
89Now
CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
85Now

Published before and after this one in the same product

← EarlierCVE-2026-52928Jun 24, 2026 · af_unix: Reject SIOCATMARK on non-stream sockets
22Monitor
← EarlierCVE-2026-52929Jun 24, 2026 · sctp: stream: fully roll back denied add-stream state
30Monitor
Later →CVE-2026-52931Jun 24, 2026 · batman-adv: tp_meter: avoid use of uninit sender vars
39Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Linux Linux	030bbc857bd51d4b25a90d931d3f8775ef22823a	Vendor (CNA)
Linux Linux	1f0d01e35dbb228084d5187212e32c91a30dcbeb	Vendor (CNA)
Linux Linux	2e5c6f4fd4001562781e99bbfc7f1f0127187542	Vendor (CNA)
Linux Linux	6560be3f6a5bb84f006f184f0c966747bb58e1a3	Vendor (CNA)
Linux Linux	92cda2593cf2ed25b0e9d78e5e6d8303bba1a064	Vendor (CNA)
Linux Linux	b1e9aef48e4d8a0c1b54fb913077b0824ed7d650	Vendor (CNA)
Linux Linux	b5107b4ce3ad45fcf369ee2058c8910620f4b5a8	Vendor (CNA)
Linux Linux	db752ebfdaf2c7f27cd9690ef48b616af068319c	Vendor (CNA)
azl3 kernel 6.6.141.1-1 on Azure Linux 3.0	6.6.143.1-1 · CBL-Mariner Releases	Microsoft (MSRC)
debian:linux	6.1.176-1 · Debian:12	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-26-0440 · Jun 25, 2026(Linux Kernel Güvenlik Bildirimi)

All national notices →

Technical details

Attack conditions

Someone with local access to the system can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

SSVC exploitation— → noneNov 6, 2026, 6:07 PM UTC
Fix✗ → ✓Sep 28, 2026, 10:09 PM UTC

For records you follow, these changes also arrive as notifications. →

References

git.kernel.org/stable/c/030bbc857bd51d4b25a90d931d3f8775ef22823a

Show all references (10 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records