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NVD / CVE Program· CNA Linux

CVE-2026-46158: mptcp: pm: ADD_ADDR rtx: always decrease sk refcount

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 25e37407442b8766ec2cf52fb4e31b5c3d3aeeae, 81d8142148164176385c279c7c1e1d581867423d, 9426265e157dd77ec237c795901ed4dea6d69b5c; 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 25e37407442b8766ec2cf52fb4e31b5c3d3aeeae, 81d8142148164176385c279c7c1e1d581867423d, 9426265e157dd77ec237c795901ed4dea6d69b5c; 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: always decrease sk refcount When an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer(). It should then be released in all cases at the end. Some (unlikely) checks were returning directly instead of calling sock_put() to decrease the refcount. Jump to a new 'exit' label to call __sock_put() (which will become sock_put() in the next commit) to fix this potential leak. While at it, drop the '!msk' check which cannot happen because it is never reset, and explicitly mark the remaining one as "unlikely".

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 28, 2026
Updated
Nov 6, 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%

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

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

Follow CVE-2026-46158

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 f5555a6d7c472849fdf2b426e3d0a85103118793affected · git
    • 00cfd77b9063dcdf3628a7087faba60de85a9cc8 and later · before e9ba34301d2e90f63f97c76ad9eb98e5250fe961affected · git
    • 00cfd77b9063dcdf3628a7087faba60de85a9cc8 and later · before 81d8142148164176385c279c7c1e1d581867423daffected · git
    • 00cfd77b9063dcdf3628a7087faba60de85a9cc8 and later · before 9426265e157dd77ec237c795901ed4dea6d69b5caffected · git
    • 00cfd77b9063dcdf3628a7087faba60de85a9cc8 and later · before b41dd76f3b9735096c21d3e799a2b9fe36498d57affected · git
    • 00cfd77b9063dcdf3628a7087faba60de85a9cc8 and later · before acd3d3562315c99f3c0db16f0fcc5f0306638982affected · git
    • 00cfd77b9063dcdf3628a7087faba60de85a9cc8 and later · before 25e37407442b8766ec2cf52fb4e31b5c3d3aeeaeaffected · git
    • 00cfd77b9063dcdf3628a7087faba60de85a9cc8 and later · before 9634cb35af17019baec21ca648516ce376fa10e6affected · 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-2026-46155May 28, 2026 · smb/client: fix out-of-bounds read in smb2_compound_op()
    36Monitor
  • ← EarlierCVE-2026-46157May 28, 2026 · ALSA: pcm: oss: Fix data race at accessing runtime.oss.trigger
    31Monitor
  • Later →CVE-2026-46159May 28, 2026 · btrfs: fix btrfs_ioctl_space_info() slot_count TOCTOU which can lead to info-leak
    18Monitor

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 Linux25e37407442b8766ec2cf52fb4e31b5c3d3aeeaeVendor (CNA)
Linux Linux81d8142148164176385c279c7c1e1d581867423dVendor (CNA)
Linux Linux9426265e157dd77ec237c795901ed4dea6d69b5cVendor (CNA)
Linux Linux9634cb35af17019baec21ca648516ce376fa10e6Vendor (CNA)
Linux Linuxacd3d3562315c99f3c0db16f0fcc5f0306638982Vendor (CNA)
Linux Linuxb41dd76f3b9735096c21d3e799a2b9fe36498d57Vendor (CNA)
Linux Linuxe9ba34301d2e90f63f97c76ad9eb98e5250fe961Vendor (CNA)
Linux Linuxf5555a6d7c472849fdf2b426e3d0a85103118793Vendor (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. SSVC exploitation— → none
  2. 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