9.8
CRITICAL
CVSS 3.1
CVE-2026-53399
nfsd: release layout stid on setlease failure
Overview
Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: release layout stid on setlease failure nfs4_alloc_stid() publishes the new stid into cl->cl_stateids via idr_alloc_cyclic() under cl_lock before returning to nfsd4_alloc_layout_stateid(). When nfsd4_layout_setlease() then fails, the error path frees the layout stateid directly with kmem_cache_free() without ever calling idr_remove(), leaving the IDR slot pointing at freed slab memory. Any subsequent IDR walker (states_show, client teardown) dereferences the dangling pointer. The correct teardown for an IDR-published stid is nfs4_put_stid(), which removes the IDR slot under cl_lock, dispatches sc_free (nfsd4_free_layout_stateid) to release ls->ls_file via nfsd4_close_layout(), and drops the nfs4_file reference in its tail. A second issue blocks that switch: nfsd4_free_layout_stateid() unconditionally inspects ls->ls_fence_work via delayed_work_pending() under ls_lock, but INIT_DELAYED_WORK(&ls->ls_fence_work, ...) currently runs only after the setlease call. On the setlease-failure path the destructor would touch an uninitialized delayed_work. nfsd4_alloc_layout_stateid() nfs4_alloc_stid() /* idr_alloc_cyclic under cl_lock */ nfsd4_layout_setlease() /* fails */ nfs4_put_stid() nfsd4_free_layout_stateid() delayed_work_pending(&ls->ls_fence_work) /* needs INIT */ nfsd4_close_layout() /* nfsd_file_put(ls->ls_file) */ put_nfs4_file() Fix by hoisting the ls_fenced / ls_fence_delay / INIT_DELAYED_WORK initialization above the nfsd4_layout_setlease() call, and replace the manual nfsd_file_put + put_nfs4_file + kmem_cache_free cleanup with a single nfs4_put_stid(stp).
Details
INFO
Published Date :
July 19, 2026, 12:16 p.m.
Last Modified :
Aug. 17, 2026, 5:17 a.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
Fix memory corruption by properly releasing state IDs and initializing delayed work queues.
- Initialize delayed work queues before setlease.
- Replace manual cleanup with nfs4_put_stid.
- Ensure state IDs are properly released.
- Hoisting initialization above setlease call.
References
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-53399.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-53399 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-53399
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-53399 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-53399 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': 'd788ef40a7517d22c97ab01700e4ae4c611b6f2f', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '2e0a5d6d62600b8c614d1b55e50ef94035d6adf9', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '7bbb7ce74051c8be4b69ff44ce3db370600dae61', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '48a586e382e4db1dbf958d44b63e081df5f8ed04', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': 'd369e5edfaaf83a448016e2f1da392b2174be801', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '8dee7c278f1c2b5bb80e17a6281c3812fc8b0cdd', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '83c2b7797742339bb768f83935f7ca33950db138', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '30d55c8aabb261bc3f427d6b9aae7ef6206063f9', 'versionType': 'git'}], 'programFiles': ['fs/nfsd/nfs4layouts.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.3', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/nfsd/nfs4layouts.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': 'd788ef40a7517d22c97ab01700e4ae4c611b6f2f', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '2e0a5d6d62600b8c614d1b55e50ef94035d6adf9', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '7bbb7ce74051c8be4b69ff44ce3db370600dae61', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '48a586e382e4db1dbf958d44b63e081df5f8ed04', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': 'd369e5edfaaf83a448016e2f1da392b2174be801', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '8dee7c278f1c2b5bb80e17a6281c3812fc8b0cdd', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '83c2b7797742339bb768f83935f7ca33950db138', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '30d55c8aabb261bc3f427d6b9aae7ef6206063f9', 'versionType': 'git'}], 'programFiles': ['fs/nfsd/nfs4layouts.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.3', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/nfsd/nfs4layouts.c'], 'defaultStatus': 'affected'}] -
Initial Analysis by [email protected]
Jul. 29, 2026
Action Type Old Value New Value Added CWE CWE-476 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.1.3 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.0 up to (excluding) 5.10.261 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.212 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.178 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.145 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.96 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.39 Added Reference Type kernel.org: https://git.kernel.org/stable/c/2e0a5d6d62600b8c614d1b55e50ef94035d6adf9 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/30d55c8aabb261bc3f427d6b9aae7ef6206063f9 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/48a586e382e4db1dbf958d44b63e081df5f8ed04 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/7bbb7ce74051c8be4b69ff44ce3db370600dae61 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/83c2b7797742339bb768f83935f7ca33950db138 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/8dee7c278f1c2b5bb80e17a6281c3812fc8b0cdd Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d369e5edfaaf83a448016e2f1da392b2174be801 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d788ef40a7517d22c97ab01700e4ae4c611b6f2f Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 24, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/2e0a5d6d62600b8c614d1b55e50ef94035d6adf9 Added Reference https://git.kernel.org/stable/c/48a586e382e4db1dbf958d44b63e081df5f8ed04 Added Reference https://git.kernel.org/stable/c/7bbb7ce74051c8be4b69ff44ce3db370600dae61 Added Reference https://git.kernel.org/stable/c/d788ef40a7517d22c97ab01700e4ae4c611b6f2f Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': 'd369e5edfaaf83a448016e2f1da392b2174be801', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '8dee7c278f1c2b5bb80e17a6281c3812fc8b0cdd', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '83c2b7797742339bb768f83935f7ca33950db138', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '30d55c8aabb261bc3f427d6b9aae7ef6206063f9', 'versionType': 'git'}], 'programFiles': ['fs/nfsd/nfs4layouts.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.3', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/nfsd/nfs4layouts.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': 'd788ef40a7517d22c97ab01700e4ae4c611b6f2f', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '2e0a5d6d62600b8c614d1b55e50ef94035d6adf9', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '7bbb7ce74051c8be4b69ff44ce3db370600dae61', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '48a586e382e4db1dbf958d44b63e081df5f8ed04', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': 'd369e5edfaaf83a448016e2f1da392b2174be801', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '8dee7c278f1c2b5bb80e17a6281c3812fc8b0cdd', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '83c2b7797742339bb768f83935f7ca33950db138', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '30d55c8aabb261bc3f427d6b9aae7ef6206063f9', 'versionType': 'git'}], 'programFiles': ['fs/nfsd/nfs4layouts.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.3', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/nfsd/nfs4layouts.c'], 'defaultStatus': 'affected'}] -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 20, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 19, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': 'd369e5edfaaf83a448016e2f1da392b2174be801', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '8dee7c278f1c2b5bb80e17a6281c3812fc8b0cdd', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '83c2b7797742339bb768f83935f7ca33950db138', 'versionType': 'git'}, {'status': 'affected', 'version': 'c5c707f96fc9a6e5a57ca5baac892673270abe3d', 'lessThan': '30d55c8aabb261bc3f427d6b9aae7ef6206063f9', 'versionType': 'git'}], 'programFiles': ['fs/nfsd/nfs4layouts.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.3', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/nfsd/nfs4layouts.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: nfsd: release layout stid on setlease failure nfs4_alloc_stid() publishes the new stid into cl->cl_stateids via idr_alloc_cyclic() under cl_lock before returning to nfsd4_alloc_layout_stateid(). When nfsd4_layout_setlease() then fails, the error path frees the layout stateid directly with kmem_cache_free() without ever calling idr_remove(), leaving the IDR slot pointing at freed slab memory. Any subsequent IDR walker (states_show, client teardown) dereferences the dangling pointer. The correct teardown for an IDR-published stid is nfs4_put_stid(), which removes the IDR slot under cl_lock, dispatches sc_free (nfsd4_free_layout_stateid) to release ls->ls_file via nfsd4_close_layout(), and drops the nfs4_file reference in its tail. A second issue blocks that switch: nfsd4_free_layout_stateid() unconditionally inspects ls->ls_fence_work via delayed_work_pending() under ls_lock, but INIT_DELAYED_WORK(&ls->ls_fence_work, ...) currently runs only after the setlease call. On the setlease-failure path the destructor would touch an uninitialized delayed_work. nfsd4_alloc_layout_stateid() nfs4_alloc_stid() /* idr_alloc_cyclic under cl_lock */ nfsd4_layout_setlease() /* fails */ nfs4_put_stid() nfsd4_free_layout_stateid() delayed_work_pending(&ls->ls_fence_work) /* needs INIT */ nfsd4_close_layout() /* nfsd_file_put(ls->ls_file) */ put_nfs4_file() Fix by hoisting the ls_fenced / ls_fence_delay / INIT_DELAYED_WORK initialization above the nfsd4_layout_setlease() call, and replace the manual nfsd_file_put + put_nfs4_file + kmem_cache_free cleanup with a single nfs4_put_stid(stp). Added Reference https://git.kernel.org/stable/c/30d55c8aabb261bc3f427d6b9aae7ef6206063f9 Added Reference https://git.kernel.org/stable/c/83c2b7797742339bb768f83935f7ca33950db138 Added Reference https://git.kernel.org/stable/c/8dee7c278f1c2b5bb80e17a6281c3812fc8b0cdd Added Reference https://git.kernel.org/stable/c/d369e5edfaaf83a448016e2f1da392b2174be801
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.