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CVE-2025-38313· NVD / CVE Program· CNA Linux

bus: fsl-mc: fix double-free on mc_dev

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: 0.19% (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 12e4431e5078847791936820bd39df9e1ee26d2e, 1d5baab39e5b09a76870b345cdee7933871b881f, 3135e03a92f6b5259d0a7f25f728e9e7866ede3f; azl3 kernel 6.6.92.2-2 on Azure Linux 3.0 6.6.96.1-1; azl3 kernel 6.6.96.1-1 on Azure Linux 3.0 6.6.96.1-1.

Low priority for now. Upgrade to Linux Linux 12e4431e5078847791936820bd39df9e1ee26d2e, 1d5baab39e5b09a76870b345cdee7933871b881f, 3135e03a92f6b5259d0a7f25f728e9e7866ede3f; azl3 kernel 6.6.92.2-2 on Azure Linux 3.0 6.6.96.1-1; azl3 kernel 6.6.96.1-1 on Azure Linux 3.0 6.6.96.1-1 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: bus: fsl-mc: fix double-free on mc_dev The blamed commit tried to simplify how the deallocations are done but, in the process, introduced a double-free on the mc_dev variable. In case the MC device is a DPRC, a new mc_bus is allocated and the mc_dev variable is just a reference to one of its fields. In this circumstance, on the error path only the mc_bus should be freed. This commit introduces back the following checkpatch warning which is a false-positive. WARNING: kfree(NULL) is safe and this check is probably not required + if (mc_bus) + kfree(mc_bus);

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Jul 10, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 8th percentile

Report tools

JSON

Action score

31

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
  • 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.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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.

VendorProduct
linuxlinux kernel
debiandebian linux

Affected versions

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

  • debian debian linux11.0
  • linux linux kernel5.5 and later · before 5.10.239
  • linux linux kernel5.11 and later · before 5.15.186
  • linux linux kernel5.16 and later · before 6.1.142
  • linux linux kernel4.13 and later · before 5.4.295
  • linux linux kernel6.7 and later · before 6.12.34
  • linux linux kernel6.13 and later · before 6.15.3
  • linux linux kernel6.2 and later · before 6.6.94

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

    • 4.13affected
    • a042fbed02904493ae6df26ec836045f5a7d3ce2 and later · before 12e4431e5078847791936820bd39df9e1ee26d2eaffected · git
    • a042fbed02904493ae6df26ec836045f5a7d3ce2 and later · before 3135e03a92f6b5259d0a7f25f728e9e7866ede3faffected · git
    • a042fbed02904493ae6df26ec836045f5a7d3ce2 and later · before 7002b954c4a8b9965ba0f139812ee4a6f71beac8affected · git
    • a042fbed02904493ae6df26ec836045f5a7d3ce2 and later · before b2057374f326303c86d8423415ab58656eebc695affected · git
    • a042fbed02904493ae6df26ec836045f5a7d3ce2 and later · before 4b23c46eb2d88924b93aca647bde9a4b9cf62cf9affected · git
    • a042fbed02904493ae6df26ec836045f5a7d3ce2 and later · before 1d5baab39e5b09a76870b345cdee7933871b881faffected · git
    • a042fbed02904493ae6df26ec836045f5a7d3ce2 and later · before 873d47114fd5e5a1cad2018843671537cc71ac84affected · git
    • a042fbed02904493ae6df26ec836045f5a7d3ce2 and later · before d694bf8a9acdbd061596f3e7549bc8cb70750a60affected · git
    • before 4.13not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.147-16.1.147-1
Debian:13linuxbefore 6.12.35-16.12.35-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • 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
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2025-38311Jul 10, 2025 · iavf: get rid of the crit lock
    22Monitor
  • ← EarlierCVE-2025-38312Jul 10, 2025 · fbdev: core: fbcvt: avoid division by 0 in fb_cvt_hperiod()
    22Monitor
  • Later →CVE-2025-38314Jul 10, 2025 · virtio-pci: Fix result size returned for the admin command completion
    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 / packageFixed versionSource
Linux Linux12e4431e5078847791936820bd39df9e1ee26d2eVendor (CNA)
Linux Linux1d5baab39e5b09a76870b345cdee7933871b881fVendor (CNA)
Linux Linux3135e03a92f6b5259d0a7f25f728e9e7866ede3fVendor (CNA)
Linux Linux4b23c46eb2d88924b93aca647bde9a4b9cf62cf9Vendor (CNA)
Linux Linux7002b954c4a8b9965ba0f139812ee4a6f71beac8Vendor (CNA)
Linux Linux873d47114fd5e5a1cad2018843671537cc71ac84Vendor (CNA)
Linux Linuxb2057374f326303c86d8423415ab58656eebc695Vendor (CNA)
Linux Linuxd694bf8a9acdbd061596f3e7549bc8cb70750a60Vendor (CNA)
azl3 kernel 6.6.92.2-2 on Azure Linux 3.06.6.96.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 kernel 6.6.96.1-1 on Azure Linux 3.06.6.96.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.147-1 · Debian:12Package 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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.

  • CVE-2026-31608288 days apartsmb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()
    39Monitor
  • CVE-2026-31609288 days apartsmb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()
    39Monitor
  • CVE-2026-43011295 days apartnet/x25: Fix potential double free of skb
    39Monitor
  • CVE-2026-43414302 days apartscsi: qla2xxx: Completely fix fcport double free
    39Monitor
  • CVE-2026-52993349 days aparttipc: fix double-free in tipc_buf_append()
    39Monitor
  • CVE-2026-64386380 days apartsmb: client: fix query_info() replay double-free
    39Monitor

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-415 · Double Free

CVSS vector

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

  1. Fix✗ → ✓

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

References

Show all references (9 more)

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

All records