NVD / CVE Program· CNA Linux

CVE-2026-53157: net: phonet: free phonet_device after RCU grace period

Noroxi assessment

Priority: Monitor (action score 31/100)

Public proof-of-concept code exists (GitHub); there is no record of 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 09c9b92c2010481160245244ea8fa1d06d5d4ae0, 2ec8011cce0cd0fc7a5068585d867fc08d508578, 52b8f5ef82c886f7cd24617915e4b1579ddfd001; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.144.1-1.

Low priority for now. Upgrade to Linux Linux 09c9b92c2010481160245244ea8fa1d06d5d4ae0, 2ec8011cce0cd0fc7a5068585d867fc08d508578, 52b8f5ef82c886f7cd24617915e4b1579ddfd001; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.144.1-1 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: net: phonet: free phonet_device after RCU grace period phonet_device_destroy() removes a phonet_device from the per-net device list with list_del_rcu(), but frees it immediately. RCU readers walking the same list can still hold a pointer to the object after it has been removed, leading to a slab-use-after-free. Use kfree_rcu(), matching the lifetime rule already used by phonet_address_del() for the same object type.

HighCVSS 7.8 · v3.1—Proof of concept Fix available

Memory safety

BDU:2026-14012

Published: Jun 25, 2026
Updated: Jul 7, 2026
EPSS: 0.1% · 2th percentile
CWE: CWE-416

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

Get told when this record changes

Not in KEV: no record of exploitation in the wild
Proof of concept exists, no weaponized module
A fix has been released

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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 kernel2.6.33 and later · before 5.10.260
linux linux kernel5.11 and later · before 5.15.211
linux linux kernel5.16 and later · before 6.1.177
linux linux kernel6.2 and later · before 6.6.144
linux linux kernel6.7 and later · before 6.12.95
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
- 2.6.33affected
- eeb74a9d45f781ec6f47b9e0a75a6a427b53f165 and later · before d59794337ea496042288c7c68356d9b9ca7f46a9affected · git
- eeb74a9d45f781ec6f47b9e0a75a6a427b53f165 and later · before 6cd7067d6e4b0b2033ba2f918ecbd54dc2af3763affected · git
- eeb74a9d45f781ec6f47b9e0a75a6a427b53f165 and later · before 2ec8011cce0cd0fc7a5068585d867fc08d508578affected · git
- eeb74a9d45f781ec6f47b9e0a75a6a427b53f165 and later · before 09c9b92c2010481160245244ea8fa1d06d5d4ae0affected · git
- eeb74a9d45f781ec6f47b9e0a75a6a427b53f165 and later · before bd2ab4d800fc26814d89328d87b5f97ef6aa906aaffected · git
- eeb74a9d45f781ec6f47b9e0a75a6a427b53f165 and later · before 52b8f5ef82c886f7cd24617915e4b1579ddfd001affected · git
- eeb74a9d45f781ec6f47b9e0a75a6a427b53f165 and later · before bff309ea51f1395c1ef8be8b75ce62d28a319113affected · git
- eeb74a9d45f781ec6f47b9e0a75a6a427b53f165 and later · before 71de0177b28da751f407581a4515cf4d762f6296affected · git
- before 2.6.33not 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 6.1.177-1	6.1.177-1
Debian:13	linux	before 6.12.95-1	6.12.95-1
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
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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-2026-53154Jun 25, 2026 · mm/hugetlb: restore reservation on error in hugetlb folio copy paths
22Monitor
← EarlierCVE-2026-53155Jun 25, 2026 · mm/huge_memory: use correct flags for device private PMD entry
22Monitor
Later →CVE-2026-53158Jun 25, 2026 · misc: fastrpc: Fix NULL pointer dereference in rpmsg callback
22Monitor

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	09c9b92c2010481160245244ea8fa1d06d5d4ae0	Vendor (CNA)
Linux Linux	2ec8011cce0cd0fc7a5068585d867fc08d508578	Vendor (CNA)
Linux Linux	52b8f5ef82c886f7cd24617915e4b1579ddfd001	Vendor (CNA)
Linux Linux	6cd7067d6e4b0b2033ba2f918ecbd54dc2af3763	Vendor (CNA)
Linux Linux	71de0177b28da751f407581a4515cf4d762f6296	Vendor (CNA)
Linux Linux	bd2ab4d800fc26814d89328d87b5f97ef6aa906a	Vendor (CNA)
Linux Linux	bff309ea51f1395c1ef8be8b75ce62d28a319113	Vendor (CNA)
Linux Linux	d59794337ea496042288c7c68356d9b9ca7f46a9	Vendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.0	6.6.144.1-1 · CBL-Mariner Releases	Microsoft (MSRC)
debian:linux	6.1.177-1 · Debian:12	Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
Source	Kind	Date
Proof-of-concept repository on GitHub	stars:0	2026-11-02

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.

PublishedJun 25, 2026
First PoCNov 2, 2026+130 d
TodayNov 4, 2026+133 d

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).

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: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

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

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

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

nvd-primary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

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

Exploit maturitynone → pocNov 3, 2026, 3:36 AM UTC
Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

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

References

git.kernel.org/stable/c/09c9b92c2010481160245244ea8fa1d06d5d4ae0

Show all references (7 more)

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

All records