CVE-2025-38724
Linux Kernel use-after-free
- Published4 Sept 2025
Description
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().
CVSS 3.1 breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HAffected products
Remediation
- https://git.kernel.org/stable/c/22f45cedf281e6171817c8a3432c44d788c550e1
- https://git.kernel.org/stable/c/36e83eda90e0e4ac52f259f775b40b2841f8a0a3
- https://git.kernel.org/stable/c/3f252a73e81aa01660cb426735eab932e6182e8d
- https://git.kernel.org/stable/c/571a5e46c71490285d2d8c06f6b5a7cbf6c7edd1
- https://git.kernel.org/stable/c/74ad36ed60df561a303a19ecef400c7096b20306
- https://git.kernel.org/stable/c/908e4ead7f757504d8b345452730636e298cbf68
References
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://git.kernel.org/stable/c/22f45cedf281e6171817c8a3432c44d788c550e1
- https://git.kernel.org/stable/c/36e83eda90e0e4ac52f259f775b40b2841f8a0a3
- https://git.kernel.org/stable/c/3f252a73e81aa01660cb426735eab932e6182e8d
- https://git.kernel.org/stable/c/571a5e46c71490285d2d8c06f6b5a7cbf6c7edd1
- https://git.kernel.org/stable/c/74ad36ed60df561a303a19ecef400c7096b20306
- https://git.kernel.org/stable/c/908e4ead7f757504d8b345452730636e298cbf68
- https://git.kernel.org/stable/c/d35ac850410966010e92f401f4e21868a9ea4d8b
- https://git.kernel.org/stable/c/d71abd1ae4e0413707cd42b10c24a11d1aa71772
and 3 more references
Related CVEs
Recent high-severity vulnerabilities sharing a weakness type.
Frequently asked
Is CVE-2025-38724 being actively exploited?
CVE-2025-38724 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.39%.
How severe is CVE-2025-38724?
CVE-2025-38724 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.39% probability of exploitation.
Which products are affected by CVE-2025-38724?
Affected products include Debian Linux, Linux Kernel.
How do I fix CVE-2025-38724?
Upgrade affected software to a fixed version, for example Linux Kernel 5.4.297 or later, then confirm no affected versions remain in your inventory.
How Secuno handles this
Secuno correlates vulnerabilities like CVE-2025-38724 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.
Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.