01 Record

CVE-2025-38491

mptcp: make fallback action and fallback decision atomic

HighPUBLISHEDCNA: Linux

CNA base score8.2 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

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02 Description

mptcp: make fallback action and fallback decision atomic

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.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpactpartialSuccessful exploitation gives limited 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

0.22% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 12.7% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-10-15.

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

2025-07-28 11:21Z1 YR AGO

Last updated

2026-10-15 21:52Z13 DAYS AGO

Reserved

2025-04-16

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 8.2)

CNA CVSS vector

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

Weaknesses

CWE-667Improper LockingClass

Data version

5.2

Document digest

738acc3d241c72395044c94abb51c6d805b0f02269f2e02c14af40230660348c

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux0530020a7c8f2204e784f0dbdc882bbd961fdbde to < 5586518bec27666c747cd52aabb62d485686d0bf, 0530020a7c8f2204e784f0dbdc882bbd961fdbde to < 75a4c9ab8a7af0d76b31ccd1188ed178c38b35d2, 0530020a7c8f2204e784f0dbdc882bbd961fdbde to < 54999dea879fecb761225e28f274b40662918c30, 0530020a7c8f2204e784f0dbdc882bbd961fdbde to < 1d82a8fe6ee4afdc92f4e8808c9dad2a6095bbc5, 0530020a7c8f2204e784f0dbdc882bbd961fdbde to < f8a1d9b18c5efc76784f5a326e905f641f839894, 609937aa962a62e93acfc04dd370b665e6152dfb, 6654efe264b014d8ea9fc38f79efb568b1b79069, 5.10.228 to < 5.11, 5.15.169 to < 5.16, 5.19—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/5586518bec27666c747cd52aabb62d485686d0bf
git.kernel.orghttps://git.kernel.org/stable/c/75a4c9ab8a7af0d76b31ccd1188ed178c38b35d2
git.kernel.orghttps://git.kernel.org/stable/c/54999dea879fecb761225e28f274b40662918c30
git.kernel.orghttps://git.kernel.org/stable/c/1d82a8fe6ee4afdc92f4e8808c9dad2a6095bbc5
git.kernel.orghttps://git.kernel.org/stable/c/f8a1d9b18c5efc76784f5a326e905f641f839894
lists.debian.orghttps://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-032379.html

07 Fixed in

Debian 12

linux
Fixed in 6.1.153-1

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

Debian 13

linux
Fixed in 6.12.41-1

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

Debian 14

linux
Fixed in 6.16.3-1

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