01 Record

CVE-2025-40040

mm/ksm: fix flag-dropping behavior in ksm_madvise

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

mm/ksm: fix flag-dropping behavior in ksm_madvise

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

0.37% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 31.3% 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 2026-10-19.

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: 2025-10-28 11:48Z1 YR 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: 79f4b9eb8ebb1bda7b60002f4156f223d5dd2efdfdd4c899fe6b0cc66fd7dd3a

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux63c17fb8e5a46a16e10e82005748837fd11a2024 to < 850f1ea245bdc0ce6a3fd36bfb80d8cf9647cb71, 63c17fb8e5a46a16e10e82005748837fd11a2024 to < 788e5385d0ff69cdba1cabccb9dab8d9647b9239, 63c17fb8e5a46a16e10e82005748837fd11a2024 to < b69f19244c2b6475c8a6eb72f0fb0d53509e48cd, 63c17fb8e5a46a16e10e82005748837fd11a2024 to < 41cb9fd904fe0c39d52e82dd84dc3c96b7aa9693, 63c17fb8e5a46a16e10e82005748837fd11a2024 to < 92b82e232b8d8b116ac6e57aeae7a6033db92c60, 63c17fb8e5a46a16e10e82005748837fd11a2024 to < ac50c6e0a8f91a02b681af81abb2362fbb67cc18, 63c17fb8e5a46a16e10e82005748837fd11a2024 to < 76385629f45740b7888f8fcd83bde955b10f61fe, 63c17fb8e5a46a16e10e82005748837fd11a2024 to < f04aad36a07cc17b7a5d5b9a2d386ce6fae63e93, 4.6—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/850f1ea245bdc0ce6a3fd36bfb80d8cf9647cb71
git.kernel.orghttps://git.kernel.org/stable/c/788e5385d0ff69cdba1cabccb9dab8d9647b9239
git.kernel.orghttps://git.kernel.org/stable/c/b69f19244c2b6475c8a6eb72f0fb0d53509e48cd
git.kernel.orghttps://git.kernel.org/stable/c/41cb9fd904fe0c39d52e82dd84dc3c96b7aa9693
git.kernel.orghttps://git.kernel.org/stable/c/92b82e232b8d8b116ac6e57aeae7a6033db92c60
git.kernel.orghttps://git.kernel.org/stable/c/ac50c6e0a8f91a02b681af81abb2362fbb67cc18
git.kernel.orghttps://git.kernel.org/stable/c/76385629f45740b7888f8fcd83bde955b10f61fe
git.kernel.orghttps://git.kernel.org/stable/c/f04aad36a07cc17b7a5d5b9a2d386ce6fae63e93

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.