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NVD / CVE Program· CNA Linux

CVE-2026-97568: mptcp: syncookies: remember the request backup flag

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 00b2bd518911e0daab00f4749cce68c191ccebb4, 06d649f9cd03a9f8e768a658b20acf8d2c8022e0, 1668b34452009d27be3262646de748a3e48ffd51; 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 00b2bd518911e0daab00f4749cce68c191ccebb4, 06d649f9cd03a9f8e768a658b20acf8d2c8022e0, 1668b34452009d27be3262646de748a3e48ffd51; 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: syncookies: remember the request backup flag Instead of using an uninitialised bit when copying the info in subflow_ulp_clone(). To fix this, no need to extend the join_entry structure: backup is coming from struct mptcp_subflow_request_sock, only one bit. Do the same here by using one bit for both.

—No exploit Fix available
Published
Sep 25, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 11th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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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
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  • 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

    • 73e2baa301ee3f62ff971e68877adeb37f98cc67, 6.11affected
    • 1008f2bcbc8e461c1df3aebba30ac4f616ebe570 and later · before c97fa2c7ada82d4cac1c6c00643238dc4c462f15affected · git
    • 6f01f41b6a492ddf2da7609967cfaf57e7ca48a7 and later · before 1668b34452009d27be3262646de748a3e48ffd51affected · git
    • 09176f80995105c62939728fbad5c437d61e7ff4 and later · before b138e7dc719f0a3949de8bb6500b8cf1604eea06affected · git
    • 8ed3e34c766e8264d5d2e0436f86c51604d6a8a7 and later · before 360d99258a6402cb8e49771460944f19f04d25b7affected · git
    • efd340bf3d7779a3a8ec954d8ec0fb8a10f24982 and later · before 61178d0b85b4b1b53e78b06e89d018d22d102f88affected · git
    • efd340bf3d7779a3a8ec954d8ec0fb8a10f24982 and later · before 00b2bd518911e0daab00f4749cce68c191ccebb4affected · git
    • efd340bf3d7779a3a8ec954d8ec0fb8a10f24982 and later · before 06d649f9cd03a9f8e768a658b20acf8d2c8022e0affected · git
    • efd340bf3d7779a3a8ec954d8ec0fb8a10f24982 and later · before b76c0e28b392620dfbaf92cdeedbf115820b44cbaffected · git
    • 5.10.224 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-2026-97566Sep 25, 2026 · mptcp: pm: kernel: drop pending ADD_ADDR when removing ID0
    0Monitor
  • ← EarlierCVE-2026-97567Sep 25, 2026 · mptcp: prevent race between disconnect() and rtx
    0Monitor
  • Later →CVE-2026-97569Sep 25, 2026 · bnxt_en: Prevent queue stop with deferred completions
    0Monitor

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 Linux00b2bd518911e0daab00f4749cce68c191ccebb4Vendor (CNA)
Linux Linux06d649f9cd03a9f8e768a658b20acf8d2c8022e0Vendor (CNA)
Linux Linux1668b34452009d27be3262646de748a3e48ffd51Vendor (CNA)
Linux Linux360d99258a6402cb8e49771460944f19f04d25b7Vendor (CNA)
Linux Linux5.10.271Vendor (CNA)
Linux Linux5.15.222Vendor (CNA)
Linux Linux6.1.189Vendor (CNA)
Linux Linux6.11Vendor (CNA)
Linux Linux6.6.158Vendor (CNA)
Linux Linux61178d0b85b4b1b53e78b06e89d018d22d102f88Vendor (CNA)
Linux Linuxb138e7dc719f0a3949de8bb6500b8cf1604eea06Vendor (CNA)
Linux Linuxb76c0e28b392620dfbaf92cdeedbf115820b44cbVendor (CNA)
Linux Linuxc97fa2c7ada82d4cac1c6c00643238dc4c462f15Vendor (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

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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.

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