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CVE-2025-37899

27
FAUCET Score

CVE-2025-37899 describes a use-after-free vulnerability in the ksmbd module of the Linux kernel, affecting various Linux kernel versions. This flaw, rated High severity with a CVSS score of 7.8, allows a local, low-privileged attacker to achieve high confidentiality, integrity, and availability impacts without user interaction. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion and media coverage, indicating awareness and potential for future exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
>= 5.15, < 6.12.28CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 6.13, < 6.14.6CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
6.15CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:*
6.15CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:*
6.15CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.8HIGH

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.47%
Probability of exploitation in next 30 days
EPSS Percentile
38.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0047 is in the 78th percentile among its peer group of 17,070 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (29)

difypatch availablevia llm_extracted
View patch
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp-fips (noble)Fixed in: 6.8.0-1048.51+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-realtime-6.8 (jammy)Fixed in: 6.8.1-1042.43~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-realtime (noble)Fixed in: 6.8.1-1042.43
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp-6.8 (jammy)Fixed in: 6.8.0-1048.51~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-oracle-6.8 (jammy)Fixed in: 6.8.0-1044.45~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp (noble)Fixed in: 6.8.0-1048.51
ubuntupatch availablevia ubuntu_usn
Product: linux-gke (noble)Fixed in: 6.8.0-1044.49
ubuntupatch availablevia ubuntu_usn
Product: linux-raspi-realtime (noble)Fixed in: 6.8.0-2038.39
ubuntupatch availablevia ubuntu_usn
Product: linux-hwe-6.8 (jammy)Fixed in: 6.8.0-101.101~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-lowlatency-hwe-6.8 (jammy)Fixed in: 6.8.0-101.101.1~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux (noble)Fixed in: 6.8.0-101.101
ubuntupatch availablevia ubuntu_usn
Product: linux-gkeop (noble)Fixed in: 6.8.0-1031.34
ubuntupatch availablevia ubuntu_usn
Product: linux-lowlatency (noble)Fixed in: 6.8.0-101.101.1
ubuntupatch availablevia ubuntu_usn
Product: linux-fips (noble)Fixed in: 6.8.0-101.101+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-raspi (noble)Fixed in: 6.8.0-1048.52
ubuntupatch availablevia ubuntu_usn
Product: linux-aws-6.8 (jammy)Fixed in: 6.8.0-1047.50~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-ibm-6.8 (jammy)Fixed in: 6.8.0-1045.45~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-aws (noble)Fixed in: 6.8.0-1047.50
ubuntupatch availablevia ubuntu_usn
Product: linux-ibm (noble)Fixed in: 6.8.0-1045.45
ubuntupatch availablevia ubuntu_usn
Product: linux-xilinx (noble)Fixed in: 6.8.0-1024.25
ubuntupatch availablevia ubuntu_usn
Product: linux-aws-fips (noble)Fixed in: 6.8.0-1047.50+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia-6.8 (jammy)Fixed in: 6.8.0-1047.50~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia (noble)Fixed in: 6.8.0-1047.50
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia-lowlatency (noble)Fixed in: 6.8.0-1047.50.1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-fips (noble)Fixed in: 6.8.0-1047.53+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-6.8 (jammy)Fixed in: 6.8.0-1051.57~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure (noble)Fixed in: 6.8.0-1051.57
ubuntupatch availablevia ubuntu_usn
Product: linux-oracle (noble)Fixed in: 6.8.0-1044.45

Vendor Advisories (14)

ubuntuUSN-8126-1

Linux kernel (Azure) vulnerabilities

Mar 25, 2026
ubuntuUSN-8125-1

Linux kernel (Azure) vulnerabilities

Mar 25, 2026
ubuntuUSN-8059-9

Linux kernel (Azure FIPS) vulnerabilities

Mar 24, 2026
difyllm-dify-fbd99855d6202974

USN-8059-9: Linux kernel (Azure FIPS) vulnerabilities

Mar 24, 2026
ubuntuUSN-8059-8

Linux kernel (NVIDIA) vulnerabilities

Mar 10, 2026
ubuntuUSN-8059-7

Linux kernel (AWS FIPS) vulnerabilities

Mar 4, 2026
ubuntuUSN-8059-6

Linux kernel vulnerabilities

Feb 26, 2026
ubuntuUSN-8059-5

Linux kernel (FIPS) vulnerabilities

Feb 25, 2026
ubuntuUSN-8059-4

Linux kernel (Real-time) vulnerabilities

Feb 25, 2026
ubuntuUSN-8059-3

Linux kernel vulnerabilities

Feb 25, 2026
ubuntuUSN-8059-2

Linux kernel (Raspberry Pi Real-time) vulnerabilities

Feb 24, 2026
ubuntuUSN-8059-1

Linux kernel vulnerabilities

Feb 24, 2026
redhatCVE-2025-37899Low

kernel: ksmbd: fix use-after-free in session logoff

May 20, 2025
microsoft2025-May/CVE-2025-37899Moderate

ksmbd: fix use-after-free in session logoff

May 13, 2025

References

git.kernel.org / stable/c/02d16046cd11a5c037b28c12ffb818c56dd3ef43
Patch
git.kernel.org / stable/c/2fc9feff45d92a92cd5f96487655d5be23fb7e2b
Patch
git.kernel.org / stable/c/70ad6455139e26e85f48f95d0e21f351c1909342
git.kernel.org / stable/c/931dc8a3670f71c45c0b1379ea4e92dafbda1aca
git.kernel.org / stable/c/d5ec1d79509b3ee01de02c236f096bc050221b7f
Patch
news.ycombinator.com / item
ExploitIssue TrackingThird Party Advisory
sean.heelan.io / 2025/05/22/how-i-used-o3-to-find-cve-2025-37899-a-remote-zeroday-vulnerability-in-the-linux-kernels-smb-implementation
ExploitThird Party Advisory