CVE-2026-63800
pNFS: Fix use-after-free in pnfs_update_layout()
Description
In the Linux kernel, the following vulnerability has been resolved: pNFS: Fix use-after-free in pnfs_update_layout() When hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(), the code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds, pnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(), which still references 'lo'. This results in a use-after-free when the tracepoint accesses lo's fields. Fix this by moving the tracepoint call before pnfs_put_layout_hdr(lo).
INFO
Published Date :
July 19, 2026, 12:16 p.m.
Last Modified :
July 19, 2026, 12:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-63800
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Move tracepoint call before pnfs_put_layout_hdr().
- Apply the provided kernel patch.
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-2026-63800.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-63800 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-2026-63800
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-2026-63800 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-63800 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.
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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': '06f58dbc49a23c99e5c0f246879ed16667f7bf8f', 'lessThan': '4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98', 'versionType': 'git'}, {'status': 'affected', 'version': '2c8d5fc37fe2384a9bdb6965443ab9224d46f704', 'lessThan': '1f24b8302c77dcaf79c64c073877a3b9f4dd25d2', 'versionType': 'git'}, {'status': 'affected', 'version': '2c8d5fc37fe2384a9bdb6965443ab9224d46f704', 'lessThan': '9c0fb5c09ae5bd68dc0038692af8127029cb0385', 'versionType': 'git'}, {'status': 'affected', 'version': '2c8d5fc37fe2384a9bdb6965443ab9224d46f704', 'lessThan': '7e37e9b3e82ade881e1798e2f4fcc54aff7793c1', 'versionType': 'git'}, {'status': 'affected', 'version': '2c8d5fc37fe2384a9bdb6965443ab9224d46f704', 'lessThan': '2883ddd7542b4437a2ab4908fe2773f690e20889', 'versionType': 'git'}, {'status': 'affected', 'version': '2c8d5fc37fe2384a9bdb6965443ab9224d46f704', 'lessThan': '200e7637f4d6a1342987045eea72641524f909dc', 'versionType': 'git'}, {'status': 'affected', 'version': '2c8d5fc37fe2384a9bdb6965443ab9224d46f704', 'lessThan': '9645aaf689aff57427ece3b9fa47d5b5399417f4', 'versionType': 'git'}, {'status': 'affected', 'version': '2c8d5fc37fe2384a9bdb6965443ab9224d46f704', 'lessThan': '13e198a90ca4050f4bee8a3f23680389a6563ccc', 'versionType': 'git'}, {'status': 'affected', 'version': 'aa2399f55eff4ec78330bb6fe55f9df53e5cae0c', 'versionType': 'git'}, {'status': 'affected', 'version': '5.10.9', 'lessThan': '5.10.260', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.4.91', 'lessThan': '5.5', 'versionType': 'semver'}], 'programFiles': ['fs/nfs/pnfs.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.11'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.11', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.260', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.211', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.177', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.144', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.95', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.38', '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/nfs/pnfs.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: pNFS: Fix use-after-free in pnfs_update_layout() When hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(), the code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds, pnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(), which still references 'lo'. This results in a use-after-free when the tracepoint accesses lo's fields. Fix this by moving the tracepoint call before pnfs_put_layout_hdr(lo). Added Reference https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563ccc Added Reference https://git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2 Added Reference https://git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dc Added Reference https://git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889 Added Reference https://git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98 Added Reference https://git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1 Added Reference https://git.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4 Added Reference https://git.kernel.org/stable/c/9c0fb5c09ae5bd68dc0038692af8127029cb0385