NVD / CVE Program· CNA Linux

CVE-2026-53160: misc: fastrpc: fix use-after-free race in fastrpc_map_create

Noroxi assessment

Priority: Monitor (action score 31/100)

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 07ebe87915d8accdaba20c4f88c5ae430fe62fbb, 0a3b87293fbd34fda651e6aead9964f84b893962, 5b0166112019d1dce30b976ab28fd67f7f0be532; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1.

Low priority for now. Upgrade to Linux Linux 07ebe87915d8accdaba20c4f88c5ae430fe62fbb, 0a3b87293fbd34fda651e6aead9964f84b893962, 5b0166112019d1dce30b976ab28fd67f7f0be532; 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: misc: fastrpc: fix use-after-free race in fastrpc_map_create fastrpc_map_lookup returns a raw pointer after releasing fl->lock. The caller fastrpc_map_create then calls fastrpc_map_get (kref_get_unless_zero) on this unprotected pointer. A concurrent MEM_UNMAP can free the map between the lock release and the kref operation, resulting in a use-after-free on the freed slab object. Restore the take_ref parameter to fastrpc_map_lookup so the reference is acquired atomically under fl->lock before the pointer is exposed to the caller.

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

Published: Jun 25, 2026
Updated: Aug 5, 2026
EPSS: 0.1% · 2th percentile
CWE: CWE-416

Report tools

JSON

Action score

Monitor

Low priority for now.

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

CNA vs NVD score

NVD: —
CNA · Linux: 7.8; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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

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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 kernel6.1.156 and later · before 6.1.176
linux linux kernel6.6.112 and later · before 6.6.143
linux linux kernel6.12.53 and later · before 6.12.94
linux linux kernel6.17.3 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
- f3f59bab68e9bc714f757ab22f3fb36153014043, 6.18affected
- 0b70ec82b309a4093106ff399da1911ad23b52d3 and later · before 0a3b87293fbd34fda651e6aead9964f84b893962affected · git
- d7513b47082c08105e837b06cebeb3f07a5fa56f and later · before 8b080c89183196fd3e49212f2a1a1c4a29335b9caffected · git
- 802359a52676176b18713e33caa17572ad009057 and later · before 5b0166112019d1dce30b976ab28fd67f7f0be532affected · git
- 10df039834f84a297c72ec962c0f9b7c8c5ca31a and later · before 992f121796b7ca83a5a8b93da24e971363206218affected · git
- 10df039834f84a297c72ec962c0f9b7c8c5ca31a and later · before f20f6512ecb75c816e0debf4551a138f098615c4affected · git
- 10df039834f84a297c72ec962c0f9b7c8c5ca31a and later · before 07ebe87915d8accdaba20c4f88c5ae430fe62fbbaffected · git
- 6.1.156 and later · before 6.1.176affected · semver
- 6.6.112 and later · before 6.6.143affected · semver
- 6.12.53 and later · before 6.12.94affected · 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
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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-2026-53158Jun 25, 2026 · misc: fastrpc: Fix NULL pointer dereference in rpmsg callback
22Monitor
← EarlierCVE-2026-53159Jun 25, 2026 · misc: fastrpc: fix DMA address corruption due to find_vma misuse
22Monitor
Later →CVE-2026-53161Jun 25, 2026 · misc: fastrpc: fix use-after-free of fastrpc_user in workqueue context
31Monitor

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	07ebe87915d8accdaba20c4f88c5ae430fe62fbb	Vendor (CNA)
Linux Linux	0a3b87293fbd34fda651e6aead9964f84b893962	Vendor (CNA)
Linux Linux	5b0166112019d1dce30b976ab28fd67f7f0be532	Vendor (CNA)
Linux Linux	6.1.176	Vendor (CNA)
Linux Linux	6.12.94	Vendor (CNA)
Linux Linux	6.18	Vendor (CNA)
Linux Linux	6.6.143	Vendor (CNA)
Linux Linux	8b080c89183196fd3e49212f2a1a1c4a29335b9c	Vendor (CNA)
Linux Linux	992f121796b7ca83a5a8b93da24e971363206218	Vendor (CNA)
Linux Linux	f20f6512ecb75c816e0debf4551a138f098615c4	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).

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-secondary

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

Fix✗ → ✓Sep 28, 2026, 10:10 PM UTC

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

References

git.kernel.org/stable/c/07ebe87915d8accdaba20c4f88c5ae430fe62fbb

Show all references (5 more)

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

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