CVE-2025-40204

NONECVSS 0.0

0.0

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

sctp: Fix MAC comparison to be constant-time

To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.

CVSS v3: —
EG Score: 0.0(none)
EPSS: 6.7%
KEV: Not listed

Published

November 12, 2025

Last Modified

April 15, 2026

References (8)

416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0b32ff285ff6f6f1ac1d9495787ccce8837d6405
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0e8b8c326c2a6de4d837b1bb034ea704f4690d77
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1cd60e0d0fb8f0e62ec4499138afce6342dc9d4c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8019b3699289fce3f10b63f98601db97b8d105b0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9c05d44ec24126fc283835b68f82dba3ae985209
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b93fa8dc521d00d2d44bf034fb90e0d79b036617
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dd91c79e4f58fbe2898dac84858033700e0e99fb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ed3044b9c810c5c24eb2830053fbfe5fd134c5d4

Vendor Advisories for CVE-2025-40204(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

CVE-2025-40204
Microsoft Security Response Center (MSRC)High
sctp: Fix MAC comparison to be constant-time

Patch Availability(30)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	linux-tools-gcp-64k-6.17 (6.17.0-1007.7) @ questing	2026-05-21	ubuntu
ubuntu	linux-virtual-hwe-24.04-edge (6.17.0-14.14) @ questing	2026-05-21	ubuntu
ubuntu	linux-virtual-hwe-20.04-edge (5.15.0.170.159) @ jammy	2026-05-21	ubuntu
ubuntu	linux-tools-aws-edge (5.15.0.1100.107~20.04.1) @ focal	2026-05-21	ubuntu
ubuntu	linux-tools-nvidia-tegra-rt-5.15 (5.15.0.1052.52~20.04.2) @ focal	2026-05-21	ubuntu
ubuntu	linux-tools-realtime-6.8.1 (6.8.1-1045.46) @ noble	2026-05-21	ubuntu
ubuntu	linux-tools-realtime-5.15 (5.15.0.1099.103) @ jammy	2026-05-21	ubuntu
ubuntu	linux-tools-nvidia-lowlatency-5.15 (5.15.0.1095.95) @ jammy	2026-05-21	ubuntu
ubuntu	linux-tools-azure-6.17 (6.17.0-1008.8) @ questing	2026-05-21	ubuntu
ubuntu	linux-tools-oem-6.17 (6.17.0-1011.11) @ noble	2026-05-21	ubuntu
ubuntu	linux-tools-gcp-fips-5.15 (5.15.0.1100.90) @ jammy	2026-05-21	ubuntu
ubuntu	linux-tools-oracle-lts-22.04 (5.15.0.1097.93) @ jammy	2026-05-21	ubuntu
ubuntu	linux-tools-oracle-64k-6.17 (6.17.0-1007.7) @ questing	2026-05-21	ubuntu
ubuntu	linux-tools-nvidia-tegra-igx-rt-5.15 (5.15.0.1041.43) @ jammy	2026-05-21	ubuntu
ubuntu	linux-virtual-6.8 (6.8.0-106.106) @ noble	2026-05-21	ubuntu
ubuntu	linux-tools-intel-iotg-5.15 (5.15.0.1095.95) @ jammy	2026-05-21	ubuntu
ubuntu	linux-xilinx-zynqmp-tools-5.15.0-1064 (5.15.0-1064.68) @ jammy	2026-05-21	ubuntu
ubuntu	linux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1049.52.1) @ noble	2026-05-21	ubuntu
ubuntu	linux-tools-gcp-fips-6.8 (6.8.0-1052.55+fips1) @ noble	2026-05-21	ubuntu
ubuntu	linux-tools-aws-edge (6.8.0-1050.53~22.04.1) @ jammy	2026-05-21	ubuntu
ubuntu	linux-tools-azure-lts-24.04 (6.8.0-1051.57) @ noble	2026-05-21	ubuntu
ubuntu	linux-tools-azure-edge (6.8.0-1051.57~22.04.1) @ jammy	2026-05-21	ubuntu
ubuntu	linux-xilinx-zynqmp (6.8.0.1029.30) @ noble	2026-05-21	ubuntu
ubuntu	linux-tools-raspi-realtime-6.8 (6.8.0-2040.41) @ noble	2026-05-21	ubuntu
ubuntu	linux-tools-raspi-nolpae (5.15.0.1097.95) @ jammy	2026-05-21	ubuntu
ubuntu	linux-tools-azure-edge (5.15.0.1110.119~20.04.1) @ focal	2026-05-21	ubuntu
ubuntu	linux-tools-azure-lts-22.04 (5.15.0.1109.107) @ jammy	2026-05-21	ubuntu
ubuntu	linux-tools-azure-fips-6.8 (6.8.0-1052.58+fips1) @ noble	2026-05-21	ubuntu
ubuntu	linux-tools-azure-fips-5.15 (5.15.0.1109.94) @ jammy	2026-05-21	ubuntu
linux	Kernel @ 5.4.301	—	osv

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.

Additional Vendor Advisories

(24)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 8× in last 7d / 59× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-16 17:52 UTCEPSS rescore
2026-06-16 17:52 UTCEPSS rescore
2026-06-14 23:17 UTCEPSS rescore
2026-06-13 23:00 UTCEPSS rescore
2026-06-12 23:11 UTCEPSS rescore
2026-06-11 14:00 UTCEPSS rescore
2026-06-10 22:18 UTCEPSS rescore
2026-06-10 13:22 UTCEPSS rescore
2026-06-08 14:16 UTCEPSS rescore
2026-06-08 14:16 UTCEPSS rescore
2026-06-07 15:24 UTCEPSS rescore
2026-06-06 13:47 UTCEPSS rescore
2026-06-06 13:47 UTCEPSS rescore
2026-06-05 22:46 UTCEPSS rescore
2026-06-05 22:46 UTCEPSS rescore
2026-06-05 06:10 UTCEPSS rescore
2026-06-05 06:10 UTCEPSS rescore
2026-06-02 20:12 UTCEPSS rescore
2026-06-02 05:39 UTCOSV refresh
2026-06-01 13:51 UTCEPSS rescore
2026-06-01 13:51 UTCEPSS rescore
2026-05-31 22:30 UTCEPSS rescore
2026-05-31 22:30 UTCEPSS rescore
2026-05-31 00:16 UTCEPSS rescore
2026-05-29 13:44 UTCEPSS rescore

Show 34 more

2026-05-28 13:44 UTCEPSS rescore
2026-05-28 13:44 UTCEPSS rescore
2026-05-28 13:44 UTCEPSS rescore
2026-05-28 13:44 UTCEPSS rescore
2026-05-27 13:40 UTCEPSS rescore
2026-05-27 13:40 UTCEPSS rescore
2026-05-27 13:40 UTCEPSS rescore
2026-05-27 13:40 UTCEPSS rescore
2026-05-26 13:43 UTCEPSS rescore
2026-05-26 13:43 UTCEPSS rescore
2026-05-26 13:43 UTCEPSS rescore
2026-05-26 13:43 UTCEPSS rescore
2026-05-26 07:18 UTCEPSS rescore
2026-05-26 07:18 UTCEPSS rescore
2026-05-26 07:18 UTCEPSS rescore
2026-05-26 07:18 UTCEPSS rescore
2026-05-24 16:57 UTCEPSS rescore
2026-05-22 21:16 UTCEPSS rescore
2026-05-22 21:16 UTCEPSS rescore
2026-05-22 21:16 UTCEPSS rescore
2026-05-22 21:16 UTCEPSS rescore
2026-05-21 04:46 UTCEG score recompute
2026-05-21 04:46 UTCVendor advisory
2026-05-21 04:46 UTCGHSA enrichment
2026-05-20 22:37 UTCEPSS rescore
2026-05-20 22:37 UTCEPSS rescore
2026-05-20 22:37 UTCEPSS rescore
2026-05-20 22:37 UTCEPSS rescore
2026-05-20 22:37 UTCEPSS rescore
2026-05-20 11:21 UTCEPSS rescore
2026-05-20 11:21 UTCEPSS rescore
2026-05-20 11:21 UTCEPSS rescore
2026-05-20 11:21 UTCEPSS rescore
2026-05-18 21:31 UTCEPSS rescore

Frequently asked(4)

What is CVE-2025-40204?

CVE-2025-40204 is a none vulnerability published on November 12, 2025. In the Linux kernel, the following vulnerability has been resolved: sctp: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.

When was CVE-2025-40204 disclosed?

CVE-2025-40204 was first published in the National Vulnerability Database on November 12, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2025-40204 actively exploited?

CVE-2025-40204 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-2025-40204?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-40204, 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

Explore the affected products and dependency analysis for CVE-2025-40204

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CVE-2025-40204

Published

Last Modified

References (8)

Vendor Advisories for CVE-2025-40204(1)

Patch Availability(30)

Additional Vendor Advisories

Data Freshness Timeline

Frequently asked(4)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2025-40204?

Same product

Same vendor

CVE-2025-40204

📅 Published

🔄 Last Modified

🔗 References (8)

📣 Vendor Advisories for CVE-2025-40204(1)

Patch Availability(30)

Additional Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(4)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2025-40204?

🔗 Related CVEs(same product + same vendor)

Same product

Same vendor

Published

Last Modified

References (8)

Vendor Advisories for CVE-2025-40204(1)

Frequently asked(4)

Related CVEs(same product + same vendor)