CVE-2025-38724 | nfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm()

In the Linux kernel, the following vulnerability has been resolved: nfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm() Lei Lu recently reported that nfsd4_setclientid_confirm() did not check the return value from get_client_locked(). a SETCLIENTID_CONFIRM could race with a confirmed client expiring and fail to get a reference. That could later lead to a UAF. Fix this by getting a reference early in the case where there is an extant confirmed client. If that fails then treat it as if there were no confirmed client found at all. In the case where the unconfirmed client is expiring, just fail and return the result from get_client_locked().

Published: 2025-09-04 Last update: 2026-06-17 Assigner: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Conclusion & alert: CVE-2025-38724 is rated Low Risk (33.4/100): CVSS High severity, with low exploitation likelihood (EPSS 0.16%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-38724

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.03% 0.16% +0.14%
2 2026-01-09 0.07% 0.03% -0.04%
3 2025-11-19 0.07%

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-38724

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
1.8 5.9 [email protected]

Weakness enumeration for CVE-2025-38724

GitHub Security Advisory for CVE-2025-38724

GHSA-x8r2-g34h-2v3j · Severity: high — In the Linux kernel, the following vulnerability has been resolved: nfsd: handle...

OS Trackers for CVE-2025-38724

vendor priority summary link
debian not yet assigned CVE-2025-38724 not yet assigned priority: Debian including 2 source packages (linux, linux-6.1), 6 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 6. https://security-tracker.debian.org/tracker/CVE-2025-38724
redhat medium https://access.redhat.com/security/cve/CVE-2025-38724
suse medium CVE-2025-38724 severity moderate: SUSE including 534 source package names (2.1.3-6.80:kernel-default-base-6.4.0-35.1.21.12, 2.1.3-7.57:kernel-default-6.4.0-35.1, …), 1019 product×package rows across 199 product lines (Container suse/sl-micro/6.0/base-os-container, Container suse/sl-micro/6.0/kvm-os-container, … (199 product lines)): Fixed 757, Known Affected 231, First Fixed 21, Known Not Affected 10. https://www.suse.com/security/cve/CVE-2025-38724/
ubuntu medium CVE-2025-38724 medium priority: Ubuntu including 158 source packages (linux, linux-allwinner-5.19, …), 1414 status rows across 9 suites (bionic, focal, jammy, noble, plucky, questing, trusty, upstream, xenial): DNE 1017, ignored 179, released 150, needed 47, not-affected 18, needs-triage 2, pending 1. https://ubuntu.com/security/CVE-2025-38724

Affected software / configurations for CVE-2025-38724

Vendor Product Version Raw CPE
linux linux_kernel >= 3.17, < 5.4.297 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.5, < 5.10.241 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.11, < 5.15.190 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.16, < 6.1.149 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.2, < 6.6.103 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.7, < 6.12.43 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.13, < 6.15.11 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.16, < 6.16.2 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
debian debian_linux 11.0 cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

References for CVE-2025-38724

URL Tags
https://git.kernel.org/stable/c/22f45cedf281e6171817c8a3432c44d788c550e1 Patch
https://git.kernel.org/stable/c/36e83eda90e0e4ac52f259f775b40b2841f8a0a3 Patch
https://git.kernel.org/stable/c/3f252a73e81aa01660cb426735eab932e6182e8d Patch
https://git.kernel.org/stable/c/571a5e46c71490285d2d8c06f6b5a7cbf6c7edd1 Patch
https://git.kernel.org/stable/c/74ad36ed60df561a303a19ecef400c7096b20306 Patch
https://git.kernel.org/stable/c/908e4ead7f757504d8b345452730636e298cbf68 Patch
https://git.kernel.org/stable/c/d35ac850410966010e92f401f4e21868a9ea4d8b Patch
https://git.kernel.org/stable/c/d71abd1ae4e0413707cd42b10c24a11d1aa71772 Patch
https://git.kernel.org/stable/c/f3aac6cf390d8b80e1d82975faf4ac61175519c0 Patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html Mailing List Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-032379.html
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
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