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NVD / CVE Program· CNA Linux

CVE-2026-23169: mptcp: fix race in mptcp_pm_nl_flush_addrs_doit()

Noroxi assessment

Priority: Monitor (action score 18/100)

  • 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: 0.14% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: Linux Linux 1f1b9523527df02685dde603f20ff6e603d8e4a1, 338d40bab283da2639780ee3e458fb61f1567d8c, 455e882192c9833f176f3fbbbb2f036b6c5bf555; cbl2 kernel 5.15.200.1-1 on CBL Mariner 2.0 5.15.202.1-1.
  • Severity is disputed: the assigning authority (CNA) scores it 7.8, NVD 4.7.

Low priority for now. Upgrade to Linux Linux 1f1b9523527df02685dde603f20ff6e603d8e4a1, 338d40bab283da2639780ee3e458fb61f1567d8c, 455e882192c9833f176f3fbbbb2f036b6c5bf555; cbl2 kernel 5.15.200.1-1 on CBL Mariner 2.0 5.15.202.1-1 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: mptcp: fix race in mptcp_pm_nl_flush_addrs_doit() syzbot and Eulgyu Kim reported crashes in mptcp_pm_nl_get_local_id() and/or mptcp_pm_nl_is_backup() Root cause is list_splice_init() in mptcp_pm_nl_flush_addrs_doit() which is not RCU ready. list_splice_init_rcu() can not be called here while holding pernet->lock spinlock. Many thanks to Eulgyu Kim for providing a repro and testing our patches.

MediumCVSS 4.7 · v3.1—No exploit Fix available
Published
Feb 14, 2026
Updated
Aug 5, 2026
EPSS
0.1% · 3th percentile

Report tools

JSON

Action score

18

Monitor

Low priority for now.

CVSS
18 / 40 · 4.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
4.7
CNA · Linux
7.8
3.1 point gap

CVSS:3.1/AV:L/AC:L/PR:L/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-2026-23169

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 kernel5.11 and later · before 5.15.201
  • linux linux kernel5.16 and later · before 6.1.164
  • linux linux kernel6.2 and later · before 6.6.125
  • linux linux kernel6.7 and later · before 6.12.72
  • linux linux kernel6.13 and later · before 6.18.9
  • 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

    • 5.11affected
    • 141694df6573b49aa4143c92556544b4b0bbda72 and later · before 338d40bab283da2639780ee3e458fb61f1567d8caffected · git
    • 141694df6573b49aa4143c92556544b4b0bbda72 and later · before 7896dbe990d56d5bb8097863b2645355633665ebaffected · git
    • 141694df6573b49aa4143c92556544b4b0bbda72 and later · before 455e882192c9833f176f3fbbbb2f036b6c5bf555affected · git
    • 141694df6573b49aa4143c92556544b4b0bbda72 and later · before 51223bdd0f60b06cfc7f25885c4d4be917adba94affected · git
    • 141694df6573b49aa4143c92556544b4b0bbda72 and later · before 1f1b9523527df02685dde603f20ff6e603d8e4a1affected · git
    • 141694df6573b49aa4143c92556544b4b0bbda72 and later · before e2a9eeb69f7d4ca4cf4c70463af77664fdb6ab1daffected · git
    • before 5.11not affected · semver
    • 5.15.201 and later · up to and including 5.15.*not affected · semver
    • 6.1.164 and later · up to and including 6.1.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.164-16.1.164-1
Debian:13linuxbefore 6.12.73-16.12.73-1
Debian:14linuxbefore 6.18.9-16.18.9-1

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-2026-23167Feb 14, 2026 · nfc: nci: Fix race between rfkill and nci_unregister_device().
    18Monitor
  • ← EarlierCVE-2026-23168Feb 14, 2026 · flex_proportions: make fprop_new_period() hardirq safe
    22Monitor
  • Later →CVE-2026-23170Feb 14, 2026 · drm/imx/tve: fix probe device leak
    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 Linux1f1b9523527df02685dde603f20ff6e603d8e4a1Vendor (CNA)
Linux Linux338d40bab283da2639780ee3e458fb61f1567d8cVendor (CNA)
Linux Linux455e882192c9833f176f3fbbbb2f036b6c5bf555Vendor (CNA)
Linux Linux51223bdd0f60b06cfc7f25885c4d4be917adba94Vendor (CNA)
Linux Linux7896dbe990d56d5bb8097863b2645355633665ebVendor (CNA)
Linux Linuxe2a9eeb69f7d4ca4cf4c70463af77664fdb6ab1dVendor (CNA)
cbl2 kernel 5.15.200.1-1 on CBL Mariner 2.05.15.202.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.164-1 · 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.

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.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
High
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:H/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 (5 more)

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

All records