CVE-2024-40931

MEDIUMNVD 5.55.5—

5.5

In the Linux kernel, the following vulnerability has been resolved:

mptcp: ensure snd_una is properly initialized on connect

This is strictly related to commit fb7a0d334894 ("mptcp: ensure snd_nxt is properly initialized on connect"). It turns out that syzkaller can trigger the retransmit after fallback and before processing any other incoming packet - so that snd_una is still left uninitialized.

Address the issue explicitly initializing snd_una together with snd_nxt and write_seq.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 0.9%
KEV: Not listed

Published

July 12, 2024

Last Modified

November 3, 2025

References (13)

416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/208cd22ef5e57f82d38ec11c1a1703f9401d6dde
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7b9c7fc8600b64a86e4b47b2d190bba380267726
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8031b58c3a9b1db3ef68b3bd749fbee2e1e1aaa3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ef473bf1dd7e8dd08bcc04b9e2d1bfed69a0a7ce
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f03c46eabb3a67bd2993e237ab5517f00a5f1813
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f1f0a46f8bb8890b90ab7194f0a0c8fe2a3fb57f
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/208cd22ef5e57f82d38ec11c1a1703f9401d6dde
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7b9c7fc8600b64a86e4b47b2d190bba380267726
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8031b58c3a9b1db3ef68b3bd749fbee2e1e1aaa3
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ef473bf1dd7e8dd08bcc04b9e2d1bfed69a0a7ce
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f03c46eabb3a67bd2993e237ab5517f00a5f1813
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f1f0a46f8bb8890b90ab7194f0a0c8fe2a3fb57f
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Patch Availability(18)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	linux-tools-azure-lts-22.04 (5.15.0.1072.70) @ jammy	2026-05-23	ubuntu
ubuntu	linux-xilinx-zynqmp-tools-host (5.15.0-1035.39) @ jammy	2026-05-23	ubuntu
ubuntu	linux-tools-lowlatency-hwe-22.04-edge (6.8.0-44.44.1~22.04.1) @ jammy	2026-05-23	ubuntu
ubuntu	linux-tools-nvidia-hwe-22.04-edge (6.8.0-1013.14~22.04.1) @ jammy	2026-05-23	ubuntu
ubuntu	linux-tools-oracle-edge (5.15.0.1067.73~20.04.1) @ focal	2026-05-23	ubuntu
ubuntu	linux-tools-raspi (6.8.0-1011.12) @ noble	2026-05-23	ubuntu
ubuntu	linux-tools-azure-fde-edge (5.15.0.1072.81~20.04.1.49) @ focal	2026-05-23	ubuntu
ubuntu	linux-tools-lowlatency-hwe-20.04-edge (5.15.0.121.110) @ jammy	2026-05-23	ubuntu
ubuntu	linux-virtual-hwe-22.04-edge (6.8.0-45.45~22.04.1) @ jammy	2026-05-23	ubuntu
ubuntu	linux-virtual-hwe-24.04-edge (6.8.0-44.44) @ noble	2026-05-23	ubuntu
ubuntu	linux-virtual-hwe-20.04-edge (5.15.0.121.121) @ jammy	2026-05-23	ubuntu
ubuntu	linux-tools-nvidia-lowlatency-64k (6.8.0-1013.14.1) @ noble	2026-05-23	ubuntu
ubuntu	linux-tools-azure (6.8.0-1014.16) @ noble	2026-05-23	ubuntu
redhat	kernel-0:5.14.0-284.92.1.el9_2	2024-11-13	redhat
redhat	kernel-rt-0:5.14.0-284.92.1.rt14.377.el9_2	2024-11-13	redhat
redhat	kernel-0:5.14.0-427.42.1.el9_4	2024-10-30	redhat
redhat	kernel-0:4.18.0-553.22.1.el8_10	2024-09-24	redhat
redhat	kernel-rt-0:4.18.0-553.22.1.rt7.363.el8_10	2024-09-24	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-908Use of Uninitialized Resource

All Vendor Advisories

(18)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× in last 7d / 19× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:12 UTCepss_batch
2026-06-02 20:12 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-29 13:43 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-23 22:24 UTCEG score recompute
2026-05-23 22:24 UTCVendor advisory
2026-05-23 22:23 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2024-40931?

CVE-2024-40931 is a medium vulnerability published on July 12, 2024. In the Linux kernel, the following vulnerability has been resolved: mptcp: ensure snd_una is properly initialized on connect This is strictly related to commit fb7a0d334894 ("mptcp: ensure snd_nxt is properly initialized on connect"). It turns out that syzkaller can trigger the retransmit after…

When was CVE-2024-40931 disclosed?

CVE-2024-40931 was first published in the National Vulnerability Database on July 12, 2024, with the most recent update on November 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2024-40931 actively exploited?

CVE-2024-40931 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2024-40931?

CVE-2024-40931 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2024-40931?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-40931, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2024-40931

Explore →

Is Your Infrastructure Affected by CVE-2024-40931?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs

CVE-2024-40931

Published

Last Modified

References (13)

Patch Availability(18)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2024-40931?

Same vendor

Same CWE

CVE-2024-40931

📅 Published

🔄 Last Modified

🔗 References (13)

Patch Availability(18)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2024-40931?

🔗 Related CVEs(same vendor + same CWE)

Same vendor

Same CWE

Published

Last Modified

References (13)

Frequently asked(5)

Related CVEs(same vendor + same CWE)