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NVD / CVE Program· CNA Linux

CVE-2026-23098: netrom: fix double-free in nr_route_frame()

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: 0.20% (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 25aab6bfc31017a7e52035b99aef5c2b6bde8ffb, 6e0110ea90313b7c0558a0b77038274a6821caf8, 7c48fdf2d1349bb54815b56fb012b9d577707708.

Low priority for now. Upgrade to Linux Linux 25aab6bfc31017a7e52035b99aef5c2b6bde8ffb, 6e0110ea90313b7c0558a0b77038274a6821caf8, 7c48fdf2d1349bb54815b56fb012b9d577707708 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: netrom: fix double-free in nr_route_frame() In nr_route_frame(), old_skb is immediately freed without checking if nr_neigh->ax25 pointer is NULL. Therefore, if nr_neigh->ax25 is NULL, the caller function will free old_skb again, causing a double-free bug. Therefore, to prevent this, we need to modify it to check whether nr_neigh->ax25 is NULL before freeing old_skb.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Feb 4, 2026
Updated
Aug 5, 2026
EPSS
0.2% · 10th 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 · 0.2%

CNA vs NVD score

NVD
7.8
CNA · Linux
8.8
1.0 point gap

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

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

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

Follow CVE-2026-23098

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

Affected versions

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

  • linux linux kernel2.6.12.1 and later · before 5.10.249
  • linux linux kernel5.11 and later · before 5.15.199
  • linux linux kernel5.16 and later · before 6.1.162
  • linux linux kernel6.2 and later · before 6.6.122
  • linux linux kernel6.7 and later · before 6.12.68
  • linux linux kernel6.13 and later · before 6.18.8
  • linux linux kernel2.6.12
  • 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

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 25aab6bfc31017a7e52035b99aef5c2b6bde8ffbaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 6e0110ea90313b7c0558a0b77038274a6821caf8affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 7c48fdf2d1349bb54815b56fb012b9d577707708affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before bd8955337e3764f912f49b360e176d8aaecf7016affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 94d1a8bd08af1f4cc345c5c29f5db1ea72b8bb8caffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 9f5fa78d9980fe75a69835521627ab7943cb3d67affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before ba1096c315283ee3292765f6aea4cca15816c4f7affected · git
    • before 2.6.12not affected · semver
    • 5.10.249 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

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-2026-23094Feb 4, 2026 · uacce: fix isolate sysfs check condition
    22Monitor
  • ← EarlierCVE-2026-23096Feb 4, 2026 · uacce: fix cdev handling in the cleanup path
    22Monitor
  • Later →CVE-2026-23106Feb 4, 2026 · timekeeping: Adjust the leap state for the correct auxiliary timekeeper
    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 Linux25aab6bfc31017a7e52035b99aef5c2b6bde8ffbVendor (CNA)
Linux Linux6e0110ea90313b7c0558a0b77038274a6821caf8Vendor (CNA)
Linux Linux7c48fdf2d1349bb54815b56fb012b9d577707708Vendor (CNA)
Linux Linux94d1a8bd08af1f4cc345c5c29f5db1ea72b8bb8cVendor (CNA)
Linux Linux9f5fa78d9980fe75a69835521627ab7943cb3d67Vendor (CNA)
Linux Linuxba1096c315283ee3292765f6aea4cca15816c4f7Vendor (CNA)
Linux Linuxbd8955337e3764f912f49b360e176d8aaecf7016Vendor (CNA)
debian:linux6.1.162-1 · 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.

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.

  • CVE-2026-3160879 days apartsmb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()
    39Monitor
  • CVE-2026-3160979 days apartsmb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()
    39Monitor
  • CVE-2026-4301186 days apartnet/x25: Fix potential double free of skb
    39Monitor
  • CVE-2026-4341493 days apartscsi: qla2xxx: Completely fix fcport double free
    39Monitor
  • CVE-2026-52993140 days aparttipc: fix double-free in tipc_buf_append()
    39Monitor
  • CVE-2026-63888165 days apartscsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
    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 (6 more)

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

All records