CVE-2026-43394 Details
Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: Fix cred ref leak in nfsd_nl_listener_set_doit(). nfsd_nl_listener_set_doit() uses get_current_cred() without put_cred(). As we can see from other callers, svc_xprt_create_from_sa() does not require the extra refcount. nfsd_nl_listener_set_doit() is always in the process context, sendmsg(), and current->cred does not go away. Let's use current_cred() in nfsd_nl_listener_set_doit().
A vulnerability exists in the Linux kernel's NFS server (NFSD) implementation, specifically within the netlink listener command handling. The issue arises because the function 'nfsd_nl_listener_set_doit()' improperly manages credential references by using 'get_current_cred()' without a corresponding 'put_cred()' call. This oversight creates a reference leak, as the function retains an unnecessary reference to the current credentials. Although 'nfsd_nl_listener_set_doit()' operates in the process context where the credentials are stable, the correct approach is to use 'current_cred()' instead. This vulnerability affects the Linux kernel stable tree.
The vulnerability has been addressed by modifying the 'nfsd_nl_listener_set_doit()' function to use 'current_cred()' instead of 'get_current_cred()'. Users should upgrade to the latest version of the Linux kernel where this patch is applied.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/019debe5851d7355bea9ff0248cc317878924d8f | kernel.org | Patch |
| https://git.kernel.org/stable/c/02e87ec0bc706cb93fa47b43d18c4d10102c7d54 | kernel.org | Patch |
| https://git.kernel.org/stable/c/92978c83bb4eef55d02a6c990c01c423131eefa7 | kernel.org | Patch |
| https://git.kernel.org/stable/c/cba413765376bb466035c9160fa3130402971e2c | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-401 | Missing Release of Memory after Effective Lifetime | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.10, < 6.12.78 >= 6.13, < 6.18.19 >= 6.19, < 6.19.9 7.0 rc1 7.0 rc2 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 26, 2026 | Initial Analysis | [email protected] |
| May 8, 2026 | New CVE Received | kernel.org |