CVE-2026-64217
netfs: Fix overrun check in netfs_extract_user_iter()
Description
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix overrun check in netfs_extract_user_iter() Fix netfs_extract_user_iter() so that if iov_iter_extract_pages() overfills pages[], then those pages don't get included in the iterator constructed at the end of the function. If there was an overfill, memory corruption has already happened.
INFO
Published Date :
July 24, 2026, 4:16 p.m.
Last Modified :
Aug. 11, 2026, 6:26 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Apply the kernel patch for netfs_extract_user_iter().
- Update the Linux kernel to the latest version.
- Reboot the system after updating.
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-2026-64217.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64217 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-2026-64217
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-2026-64217 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64217 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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Initial Analysis by [email protected]
Aug. 11, 2026
Action Type Old Value New Value Added CWE CWE-787 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.92 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.34 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.11 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.3 up to (excluding) 6.6.142 Added Reference Type kernel.org: https://git.kernel.org/stable/c/00efe58bbdcc93272d579ca24bfc912563f4a204 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/0ef37eef83fad3542ee06db2940433ae1a92b39d Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/96cc3beb2390ba9f9c128c5733c0ccfe450dd4f9 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/afeb32d9bf9aaeea51d0f723a19f14afb73bd94d Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/f48b9157f0f611fa436c360648603d5ded719b12 Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 27, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 24, 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': '85dd2c8ff368b1446be9febde84afe1d7aec4261', 'lessThan': '00efe58bbdcc93272d579ca24bfc912563f4a204', 'versionType': 'git'}, {'status': 'affected', 'version': '85dd2c8ff368b1446be9febde84afe1d7aec4261', 'lessThan': '96cc3beb2390ba9f9c128c5733c0ccfe450dd4f9', 'versionType': 'git'}, {'status': 'affected', 'version': '85dd2c8ff368b1446be9febde84afe1d7aec4261', 'lessThan': 'afeb32d9bf9aaeea51d0f723a19f14afb73bd94d', 'versionType': 'git'}, {'status': 'affected', 'version': '85dd2c8ff368b1446be9febde84afe1d7aec4261', 'lessThan': 'f48b9157f0f611fa436c360648603d5ded719b12', 'versionType': 'git'}, {'status': 'affected', 'version': '85dd2c8ff368b1446be9febde84afe1d7aec4261', 'lessThan': '0ef37eef83fad3542ee06db2940433ae1a92b39d', 'versionType': 'git'}], 'programFiles': ['fs/netfs/iterator.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.3'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.3', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.142', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.92', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.34', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.11', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/netfs/iterator.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: netfs: Fix overrun check in netfs_extract_user_iter() Fix netfs_extract_user_iter() so that if iov_iter_extract_pages() overfills pages[], then those pages don't get included in the iterator constructed at the end of the function. If there was an overfill, memory corruption has already happened. Added Reference https://git.kernel.org/stable/c/00efe58bbdcc93272d579ca24bfc912563f4a204 Added Reference https://git.kernel.org/stable/c/0ef37eef83fad3542ee06db2940433ae1a92b39d Added Reference https://git.kernel.org/stable/c/96cc3beb2390ba9f9c128c5733c0ccfe450dd4f9 Added Reference https://git.kernel.org/stable/c/afeb32d9bf9aaeea51d0f723a19f14afb73bd94d Added Reference https://git.kernel.org/stable/c/f48b9157f0f611fa436c360648603d5ded719b12