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NVD / CVE Program· CNA Linux

CVE-2026-46170: mptcp: pm: ADD_ADDR rtx: free sk if last

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: 0.12% (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 1f26487e83e69462540bb1047139472957c913c6, 531c537b8fb620beabccfb1594e8d43cbebbb87a, 5da972efed3dc7599da6e2b5e8d906d1b7b1a728; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 1f26487e83e69462540bb1047139472957c913c6, 531c537b8fb620beabccfb1594e8d43cbebbb87a, 5da972efed3dc7599da6e2b5e8d906d1b7b1a728; 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: mptcp: pm: ADD_ADDR rtx: free sk if last When an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer(), and released at the end. If at that moment, it was the last reference being held, the sk would not be freed. sock_put() should then be called instead of __sock_put(). But that's not enough: if it is the last reference, sock_put() will call sk_free(), which will end up calling sk_stop_timer_sync() on the same timer, and waiting indefinitely to finish. So it is needed to mark that the timer is done at the end of the timer handler when it has not been rescheduled, not to call sk_stop_timer_sync() on "itself".

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 28, 2026
Updated
Sep 14, 2026
EPSS
0.1% · 2th percentile
CWE
—

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%

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-2026-46170

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 kernel5.10 and later · before 6.6.142
  • linux linux kernel6.7 and later · before 6.12.92
  • linux linux kernel6.13 and later · before 6.18.30
  • linux linux kernel6.19 and later · before 7.0.7
  • 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

    • 5.10affected
    • 00cfd77b9063dcdf3628a7087faba60de85a9cc8 and later · before aa8cabde7e83bf96269ee47427dc9b59e3ed8e60affected · git
    • 00cfd77b9063dcdf3628a7087faba60de85a9cc8 and later · before 1f26487e83e69462540bb1047139472957c913c6affected · git
    • 00cfd77b9063dcdf3628a7087faba60de85a9cc8 and later · before 5da972efed3dc7599da6e2b5e8d906d1b7b1a728affected · git
    • 00cfd77b9063dcdf3628a7087faba60de85a9cc8 and later · before 6a3af482188f6db4186d1605f64d911d7330abb3affected · git
    • 00cfd77b9063dcdf3628a7087faba60de85a9cc8 and later · before 531c537b8fb620beabccfb1594e8d43cbebbb87aaffected · git
    • 00cfd77b9063dcdf3628a7087faba60de85a9cc8 and later · before b74ad20198652b6b39a761c277ba65ae82b1e107affected · git
    • 00cfd77b9063dcdf3628a7087faba60de85a9cc8 and later · before 8143a224785ceaf2b0856e08d4498916f38228fbaffected · git
    • 00cfd77b9063dcdf3628a7087faba60de85a9cc8 and later · before b7b9a461569734d33d3259d58d2507adfac107edaffected · git
    • before 5.10not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:13linuxbefore 6.12.94-16.12.94-1
Debian:14linuxbefore 7.0.7-17.0.7-1

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-2026-46164May 28, 2026 · btrfs: fix double free in create_space_info_sub_group() error path
    28Monitor
  • ← EarlierCVE-2026-46169May 28, 2026 · hfsplus: fix uninit-value by validating catalog record size
    22Monitor
  • Later →CVE-2026-46179May 28, 2026 · ASoC: SOF: Don't allow pointer operations on unconfigured streams
    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 Linux1f26487e83e69462540bb1047139472957c913c6Vendor (CNA)
Linux Linux531c537b8fb620beabccfb1594e8d43cbebbb87aVendor (CNA)
Linux Linux5da972efed3dc7599da6e2b5e8d906d1b7b1a728Vendor (CNA)
Linux Linux6a3af482188f6db4186d1605f64d911d7330abb3Vendor (CNA)
Linux Linux8143a224785ceaf2b0856e08d4498916f38228fbVendor (CNA)
Linux Linuxaa8cabde7e83bf96269ee47427dc9b59e3ed8e60Vendor (CNA)
Linux Linuxb74ad20198652b6b39a761c277ba65ae82b1e107Vendor (CNA)
Linux Linuxb7b9a461569734d33d3259d58d2507adfac107edVendor (CNA)
azl3 kernel 6.6.141.1-1 on Azure Linux 3.06.6.143.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.187-1 · 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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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)

—

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.

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 (7 more)

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

All records