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NVD / CVE Program· CNA Linux

CVE-2026-97524: mptcp: avoid unneeded actions on subflow reset

Noroxi assessment

Priority: Monitor (action score 30/100)

  • 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: 0.72% (FIRST EPSS); higher than 53.9% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 1962841387087970d75ba8b8d4c2aa2d45705e50, 2b0f561f21b27c40c91ea4975268a06092bd7e9c, 4b7abdcb5ba832fafab679f0d998af39cbc99307; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 1962841387087970d75ba8b8d4c2aa2d45705e50, 2b0f561f21b27c40c91ea4975268a06092bd7e9c, 4b7abdcb5ba832fafab679f0d998af39cbc99307; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 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: avoid unneeded actions on subflow reset Once in a blue moon, the mptcp receive path can recursively call mptcp_data_ready() via state change under unlucky error conditions, and then try to hold the data lock again. Break the recursion loop explicitly checking for the exceptional condition. Add a new flag instead of using an existing one like 'closing', to exit early in subflow_state_change(), and explicitly flush the RX queue at reset time. This avoids unneeded processing to check for available data -- calling get_mapping_status() and more on a dying subflow -- but also in error reporting and worker scheduling. Note that we must consume the currently peeked skb before invoking mptcp_dss_corruption to avoid consuming it again after the eventual reset has freed it.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Sep 25, 2026
Updated
Oct 19, 2026
EPSS
0.7% · 53th percentile
CWE
—

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CNA vs NVD score

NVD
—
CNA · Linux
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • 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

  • 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.

—

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

    • 8bfd391bde685df7289b928ce8876a3583be4bfb, 6.12affected
    • fde99e972b8f88cebe619241d7aa43d288ef666a and later · before 6d669c740933124eae3df8cfc15995af9bcc6abaaffected · git
    • 12c1676d598e3b8dd92a033b623b792cc2ea1ec5 and later · before 83a7dcdd2b1060484528da70a643125174d47e5aaffected · git
    • 35668f8ec84f6c944676e48ecc6bbc5fc8e6fe25 and later · before a370e56024df0b07e3120c45a9773ae123819fd6affected · git
    • b8be15d1ae7ea4eedd547c3b3141f592fbddcd30 and later · before 1962841387087970d75ba8b8d4c2aa2d45705e50affected · git
    • e32d262c89e2b22cb0640223f953b548617ed8a6 and later · before 4b7abdcb5ba832fafab679f0d998af39cbc99307affected · git
    • e32d262c89e2b22cb0640223f953b548617ed8a6 and later · before b2dbcc1ed48b5ac070a41db4a52aade6823c4df0affected · git
    • e32d262c89e2b22cb0640223f953b548617ed8a6 and later · before ce7e4ede01ed3e47a48c0f1ce1d87bf4864bee9faffected · git
    • e32d262c89e2b22cb0640223f953b548617ed8a6 and later · before 2b0f561f21b27c40c91ea4975268a06092bd7e9caffected · git
    • 5.10.228 and later · before 5.10.271affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.7-17.2.7-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-97522Sep 25, 2026 · mptcp: fix bad accounting in __mptcp_subflow_push_pending()
    0Monitor
  • ← EarlierCVE-2026-97523Sep 25, 2026 · mptcp: close race between scheduler and state change
    30Monitor
  • Later →CVE-2026-97525Sep 25, 2026 · x86/mm/pat: Allocate split page tables as kernel page tables
    32Monitor

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 Linux1962841387087970d75ba8b8d4c2aa2d45705e50Vendor (CNA)
Linux Linux2b0f561f21b27c40c91ea4975268a06092bd7e9cVendor (CNA)
Linux Linux4b7abdcb5ba832fafab679f0d998af39cbc99307Vendor (CNA)
Linux Linux5.10.271Vendor (CNA)
Linux Linux5.15.222Vendor (CNA)
Linux Linux6.1.189Vendor (CNA)
Linux Linux6.12Vendor (CNA)
Linux Linux6.6.158Vendor (CNA)
Linux Linux6d669c740933124eae3df8cfc15995af9bcc6abaVendor (CNA)
Linux Linux83a7dcdd2b1060484528da70a643125174d47e5aVendor (CNA)
Linux Linuxa370e56024df0b07e3120c45a9773ae123819fd6Vendor (CNA)
Linux Linuxb2dbcc1ed48b5ac070a41db4a52aade6823c4df0Vendor (CNA)
Linux Linuxce7e4ede01ed3e47a48c0f1ce1d87bf4864bee9fVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • 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
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

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