CVE-2026-23297

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

nfsd: Fix cred ref leak in nfsd_nl_threads_set_doit().

syzbot reported memory leak of struct cred. [0]

nfsd_nl_threads_set_doit() passes get_current_cred() to

nfsd_svc(), but put_cred() is not called after that.

The cred is finally passed down to _svc_xprt_create(),

which calls get_cred() with the cred for struct svc_xprt.

The ownership of the refcount by get_current_cred() is not

transferred to anywhere and is just leaked.

nfsd_svc() is also called from write_threads(), but it does

not bump file->f_cred there.

nfsd_nl_threads_set_doit() is called from sendmsg() and

current->cred does not go away.

Let's use current_cred() in nfsd_nl_threads_set_doit().

[0]:

BUG: memory leak

unreferenced object 0xffff888108b89480 (size 184):

comm "syz-executor", pid 5994, jiffies 4294943386

hex dump (first 32 bytes):

01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

00 00 00 00 00 00 00 00 00 00 00 0

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References