CVE-2025-22025

/// Technical description

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

nfsd: put dl_stid if fail to queue dl_recall

Before calling nfsd4_run_cb to queue dl_recall to the callback_wq, we

increment the reference count of dl_stid.

We expect that after the corresponding work_struct is processed, the

reference count of dl_stid will be decremented through the callback

function nfsd4_cb_recall_release.

However, if the call to nfsd4_run_cb fails, the incremented reference

count of dl_stid will not be decremented correspondingly, leading to the

following nfs4_stid leak:

unreferenced object 0xffff88812067b578 (size 344):

comm "nfsd", pid 2761, jiffies 4295044002 (age 5541.241s)

hex dump (first 32 bytes):

01 00 00 00 6b 6b 6b 6b b8 02 c0 e2 81 88 ff ff ....kkkk........

00 6b 6b 6b 6b 6b 6b 6b 00 00 00 00 ad 4e ad de .kkkkkkk.....N..

backtrace:

kmem_cache_alloc+0x4b9/0x700

nfsd4_process_open1+0x34/0x300

nfsd4_open+0x2d1/0x9d0

nfsd4_proc_compound+0x7a2/0xe30

nfsd_

/// 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