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NVD / CVE Program· CNA Linux

CVE-2025-71182: can: j1939: make j1939_session_activate() fail if device is no longer registered

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: 0.13% (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 46ca9dc978923c5e1247a9e9519240ba7ace413c, 5d5602236f5db19e8b337a2cd87a90ace5ea776d, 78d87b72cebe2a993fd5b017e9f14fb6278f2eae.

Low priority for now. Upgrade to Linux Linux 46ca9dc978923c5e1247a9e9519240ba7ace413c, 5d5602236f5db19e8b337a2cd87a90ace5ea776d, 78d87b72cebe2a993fd5b017e9f14fb6278f2eae 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: can: j1939: make j1939_session_activate() fail if device is no longer registered syzbot is still reporting unregister_netdevice: waiting for vcan0 to become free. Usage count = 2 even after commit 93a27b5891b8 ("can: j1939: add missing calls in NETDEV_UNREGISTER notification handler") was added. A debug printk() patch found that j1939_session_activate() can succeed even after j1939_cancel_active_session() from j1939_netdev_notify(NETDEV_UNREGISTER) has completed. Since j1939_cancel_active_session() is processed with the session list lock held, checking ndev->reg_state in j1939_session_activate() with the session list lock held can reliably close the race window.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jan 31, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 3th percentile

Report tools

JSON

Action score

22

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

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When you'll hear from us

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  • 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

Affected versions

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

  • linux linux kernel5.4.1 and later · before 5.10.248
  • linux linux kernel5.11 and later · before 5.15.198
  • linux linux kernel5.16 and later · before 6.1.161
  • linux linux kernel6.2 and later · before 6.6.121
  • linux linux kernel6.7 and later · before 6.12.66
  • linux linux kernel6.13 and later · before 6.18.6
  • linux linux kernel5.4
  • linux linux kernel6.19

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

    • 5.4affected
    • 9d71dd0c70099914fcd063135da3c580865e924c and later · before ebb0dfd718dd31c8d3600612ca4b7207ec3d923aaffected · git
    • 9d71dd0c70099914fcd063135da3c580865e924c and later · before c3a4316e3c746af415c0fd6c6d489ad13f53714daffected · git
    • 9d71dd0c70099914fcd063135da3c580865e924c and later · before 46ca9dc978923c5e1247a9e9519240ba7ace413caffected · git
    • 9d71dd0c70099914fcd063135da3c580865e924c and later · before 78d87b72cebe2a993fd5b017e9f14fb6278f2eaeaffected · git
    • 9d71dd0c70099914fcd063135da3c580865e924c and later · before ba6f0d1832eeb5eb3a6dc5cb30e0f720b3cb3536affected · git
    • 9d71dd0c70099914fcd063135da3c580865e924c and later · before 79dd3f1d9dd310c2af89b09c71f34d93973b200faffected · git
    • 9d71dd0c70099914fcd063135da3c580865e924c and later · before 5d5602236f5db19e8b337a2cd87a90ace5ea776daffected · git
    • before 5.4not affected · semver
    • 5.10.248 and later · up to and including 5.10.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.162-16.1.162-1
Debian:13linuxbefore 6.12.69-16.12.69-1
Debian:14linuxbefore 6.18.8-16.18.8-1
SUSE:Linux Micro 6.1kernel-defaultbefore 6.4.0-40.16.4.0-40.1
SUSE:Linux Micro 6.1kernel-default-basebefore 6.4.0-40.1.21.176.4.0-40.1.21.17
SUSE:Linux Micro 6.1kernel-kvmsmallbefore 6.4.0-40.16.4.0-40.1
SUSE:Linux Micro 6.1kernel-sourcebefore 6.4.0-40.16.4.0-40.1

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-2026-23024Jan 31, 2026 · idpf: fix memory leak of flow steer list on rmmod
    22Monitor
  • ← EarlierCVE-2026-23025Jan 31, 2026 · mm/page_alloc: prevent pcp corruption with SMP=n
    31Monitor
  • Later →CVE-2025-71183Jan 31, 2026 · btrfs: always detect conflicting inodes when logging inode refs
    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 Linux46ca9dc978923c5e1247a9e9519240ba7ace413cVendor (CNA)
Linux Linux5d5602236f5db19e8b337a2cd87a90ace5ea776dVendor (CNA)
Linux Linux78d87b72cebe2a993fd5b017e9f14fb6278f2eaeVendor (CNA)
Linux Linux79dd3f1d9dd310c2af89b09c71f34d93973b200fVendor (CNA)
Linux Linuxba6f0d1832eeb5eb3a6dc5cb30e0f720b3cb3536Vendor (CNA)
Linux Linuxc3a4316e3c746af415c0fd6c6d489ad13f53714dVendor (CNA)
Linux Linuxebb0dfd718dd31c8d3600612ca4b7207ec3d923aVendor (CNA)
debian:linux6.1.162-1 · Debian:12Package registry (OSV)
suse:kernel-default6.4.0-40.1 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-default-base6.4.0-40.1.21.17 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-kvmsmall6.4.0-40.1 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:kernel-source6.4.0-40.1 · SUSE:Linux Micro 6.1Package 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
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)

CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

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.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

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

References

Show all references (6 more)

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

All records