Linux aws: In the Linux kernel, the following vulnerability has been resolved: nfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm() Lei Lu… (CVE-2025-38724)
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().
AI Analysis
Technical Summary
The advisory covers several kernel vulnerabilities including CVE-2025-38724 (failure handling in nfsd4_setclientid_confirm), CVE-2025-39864 (use-after-free in cfg80211's cmp_bss), CVE-2025-39883 (memory unpoisoning bug), CVE-2025-39881 (use-after-free in kernfs polling), CVE-2025-39918 (linked list corruption in mt76 WiFi driver), CVE-2025-39955 (clearing tcp_sk fastopen_rsk in tcp_disconnect), and CVE-2025-40186 (incorrect call in tcp_conn_request). These vulnerabilities affect the Linux kernel core components and could impact system stability and security. The advisory references Red Hat Enterprise Linux 9.6 Extended Update Support versions and related CodeReady Linux Builder variants. The update is rated as Important by Red Hat and requires rebooting the system after applying the patch.
Potential Impact
The vulnerabilities affect core kernel components and could lead to use-after-free conditions, memory corruption, and improper TCP connection handling. These issues may result in system crashes, denial of service, or potential escalation of privileges if exploited. However, no known exploits are reported in the wild at this time. The impact is considered high due to the kernel-level nature of the flaws.
Mitigation Recommendations
Red Hat has released an official security update for Red Hat Enterprise Linux 9.6 Extended Update Support and related products that addresses these vulnerabilities. Users should apply the provided kernel update packages and reboot their systems to ensure the fixes take effect. For detailed update instructions, refer to Red Hat's advisory at https://access.redhat.com/articles/11258. No additional mitigations are specified beyond applying the official patch and rebooting.
Linux aws: In the Linux kernel, the following vulnerability has been resolved: nfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm() Lei Lu… (CVE-2025-38724)
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 v3.1
Score 9.8critical
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The advisory covers several kernel vulnerabilities including CVE-2025-38724 (failure handling in nfsd4_setclientid_confirm), CVE-2025-39864 (use-after-free in cfg80211's cmp_bss), CVE-2025-39883 (memory unpoisoning bug), CVE-2025-39881 (use-after-free in kernfs polling), CVE-2025-39918 (linked list corruption in mt76 WiFi driver), CVE-2025-39955 (clearing tcp_sk fastopen_rsk in tcp_disconnect), and CVE-2025-40186 (incorrect call in tcp_conn_request). These vulnerabilities affect the Linux kernel core components and could impact system stability and security. The advisory references Red Hat Enterprise Linux 9.6 Extended Update Support versions and related CodeReady Linux Builder variants. The update is rated as Important by Red Hat and requires rebooting the system after applying the patch.
Potential Impact
The vulnerabilities affect core kernel components and could lead to use-after-free conditions, memory corruption, and improper TCP connection handling. These issues may result in system crashes, denial of service, or potential escalation of privileges if exploited. However, no known exploits are reported in the wild at this time. The impact is considered high due to the kernel-level nature of the flaws.
Mitigation Recommendations
Red Hat has released an official security update for Red Hat Enterprise Linux 9.6 Extended Update Support and related products that addresses these vulnerabilities. Users should apply the provided kernel update packages and reboot their systems to ensure the fixes take effect. For detailed update instructions, refer to Red Hat's advisory at https://access.redhat.com/articles/11258. No additional mitigations are specified beyond applying the official patch and rebooting.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2025:22405
- Cve Count
- 8
- Additional Cves
- ["CVE-2025-39864","CVE-2025-39898","CVE-2025-39918","CVE-2025-39955","CVE-2025-39981","CVE-2025-40058","CVE-2025-40185"]
Threat ID: 6a19fee3e29bf47b500feaf8
Added to database: 05/29/2026, 21:02:27 UTC
Last enriched: 06/26/2026, 01:35:54 UTC
Last updated: 09/10/2026, 19:36:50 UTC
Views: 127
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