01 Record

CVE-2025-40204

sctp: Fix MAC comparison to be constant-time

HighPUBLISHEDCNA: Linux

CNA base score8.1 CVSS v3.xCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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02 Description

sctp: Fix MAC comparison to be constant-time

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.46% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 40.1% of scored records. A rank, not a probability.

NVD base score

8.1 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Deferred. NVD last modified this record on 2026-10-19.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published: 2025-11-12 21:56Z11 MO AGO
Last updated: 2026-10-15 22:02Z13 DAYS AGO
Reserved: 2025-04-16
Assigning CNA: Linux
Record state: PUBLISHED
Severity: High (CVSS 8.1)
CNA CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses: No CWE assigned
Data version: 5.2
Document digest: b08012ba99be07f9edb737aaf4d5b9a34aa9acbdb9501a66bda4222ae0c35f78

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < b93fa8dc521d00d2d44bf034fb90e0d79b036617, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 0e8b8c326c2a6de4d837b1bb034ea704f4690d77, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 1cd60e0d0fb8f0e62ec4499138afce6342dc9d4c, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 9c05d44ec24126fc283835b68f82dba3ae985209, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < ed3044b9c810c5c24eb2830053fbfe5fd134c5d4, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 8019b3699289fce3f10b63f98601db97b8d105b0, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 0b32ff285ff6f6f1ac1d9495787ccce8837d6405, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < dd91c79e4f58fbe2898dac84858033700e0e99fb, 2.6.12—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/b93fa8dc521d00d2d44bf034fb90e0d79b036617
git.kernel.orghttps://git.kernel.org/stable/c/0e8b8c326c2a6de4d837b1bb034ea704f4690d77
git.kernel.orghttps://git.kernel.org/stable/c/1cd60e0d0fb8f0e62ec4499138afce6342dc9d4c
git.kernel.orghttps://git.kernel.org/stable/c/9c05d44ec24126fc283835b68f82dba3ae985209
git.kernel.orghttps://git.kernel.org/stable/c/ed3044b9c810c5c24eb2830053fbfe5fd134c5d4
git.kernel.orghttps://git.kernel.org/stable/c/8019b3699289fce3f10b63f98601db97b8d105b0
git.kernel.orghttps://git.kernel.org/stable/c/0b32ff285ff6f6f1ac1d9495787ccce8837d6405
git.kernel.orghttps://git.kernel.org/stable/c/dd91c79e4f58fbe2898dac84858033700e0e99fb

07 Fixed in

Debian 12

linux
Fixed in 6.1.158-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

linux
Fixed in 6.12.57-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 6.17.6-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.