01 Record

CVE-2025-40297

net: bridge: fix use-after-free due to MST port state bypass

HighPUBLISHEDCNA: Linux

CNA base score7.8 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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02 Description

net: bridge: fix use-after-free due to MST port state bypass

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

0.15% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 4.8% of scored records. A rank, not a probability.

NVD base score

7.8 (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:H/I:H/A:H

NVD analysis status

Deferred. 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: 2025-12-08 00:46Z10 MO AGO
Last updated: 2026-10-15 22:02Z13 DAYS AGO
Reserved: 2025-04-16
Assigning CNA: Linux
Record state: PUBLISHED
Severity: High (CVSS 7.8)
CNA CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses: No CWE assigned
Data version: 5.2
Document digest: 6738767468212f1b7ad09dd9b53f14d8401096dcf6d2460518ac815c374bdf5b

05 Affected products

VendorProductVersionsPlatforms

LinuxLinuxec7328b59176227216c461601c6bd0e922232a9b to < e19085b2a86addccff33ab8536fc67ebd9d52198, ec7328b59176227216c461601c6bd0e922232a9b to < 3b60ce334c1ce8b3fad7e02dcd5ed9f6646477c8, ec7328b59176227216c461601c6bd0e922232a9b to < bf3843183bc3158e5821b46f330c438ae9bd6ddb, ec7328b59176227216c461601c6bd0e922232a9b to < 991fbe1680cd41a5f97c92cd3a3496315df36e4b, ec7328b59176227216c461601c6bd0e922232a9b to < 8dca36978aa80bab9d4da130c211db75c9e00048, 5.18—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/e19085b2a86addccff33ab8536fc67ebd9d52198
git.kernel.orghttps://git.kernel.org/stable/c/3b60ce334c1ce8b3fad7e02dcd5ed9f6646477c8
git.kernel.orghttps://git.kernel.org/stable/c/bf3843183bc3158e5821b46f330c438ae9bd6ddb
git.kernel.orghttps://git.kernel.org/stable/c/991fbe1680cd41a5f97c92cd3a3496315df36e4b
git.kernel.orghttps://git.kernel.org/stable/c/8dca36978aa80bab9d4da130c211db75c9e00048

07 Fixed in

Debian 12

linux
Fixed in 6.1.159-1

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

Debian 13

linux
Fixed in 6.12.63-1

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

Debian 14

linux
Fixed in 6.17.8-1

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