CVE-2025-40203: linux
CVSS: 7.8v3.1HighDeferred
AliasesUBUNTU-CVE-2025-40203DEBIAN-CVE-2025-40203
Published 12-11-2025Last modified 05-08-2026
Vulnerability summary
CVE-2025-40203 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 3.9% of scored vulnerabilities.
CVSS score
7.8/10
010
High · v3.1 (CVE.org)EPSS score
0.15%
0%100%
Low · +0.01 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 11 · Related 11Timeline
- 12-11-2025PublishedVulnerability first disclosed.
- 05-08-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: listmount: don't call path_put() under namespace semaphore Massage listmount() and make sure we don't call path_put() under the namespace semaphore. If we put the last reference we're fscked.
CVSS metrics
5 scores · 4 sources · 2 versionsMedium 5.7Preferred score · OSV · Ubuntu (Ecosystem advisory) · calculated from vector
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NSourcesSingle source
High 7.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.15%
Chance of exploitation in the next 30 days
Percentile
4%
Versus all other CVEs
30-day change
+0.01 pp
From 0.14% on 21-09-2026
21-09-202621-10-2026
EPSS score0.15%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu129 products
- linuxAll versions (No fix recorded) | < 6.17.0-14.14
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 6.17.0-1007.7
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian1 product
- linux< 6.12.57-1 | < 6.17.6-1
Linux1 product
- linux≥ b4c2bea8ceaa50cd42a8f73667389d801a3ecf2d, < 659874b7ee4976ad9ce476e07fd36bc67b3537f1 | ≥ b4c2bea8ceaa50cd42a8f73667389d801a3ecf2d, < 9c80da26fda2fdcaac7f92b5908875b3108830ff | ≥ b4c2bea8ceaa50cd42a8f73667389d801a3ecf2d, < c1f86d0ac322c7e77f6f8dbd216c65d39358ffc0 | 6.8
3 vendors · 131 products
