CVE-2026-64379
smb: client: mask server-provided mode to 07777 in modefromsid
Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: mask server-provided mode to 07777 in modefromsid When modefromsid is active, parse_dacl() applies the server-provided sub_auth[2] value from the NFS mode SID to cf_mode without masking to 07777. Apply the correct masking, same as in the read path.
INFO
Published Date :
July 25, 2026, 10:17 a.m.
Last Modified :
July 25, 2026, 10:17 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-64379
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
- Update the Linux kernel to the latest patched version.
- Verify that server-provided mode values are correctly masked.
- Ensure access controls are properly configured.
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-2026-64379.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64379 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-2026-64379
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-2026-64379 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64379 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.
-
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 25, 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': 'e2f8fbfb8d09c06decde162090fac3ee220aa280', 'lessThan': '5f6f2241034f189c69d4d0b5f8fe24a0c25b0c14', 'versionType': 'git'}, {'status': 'affected', 'version': 'e2f8fbfb8d09c06decde162090fac3ee220aa280', 'lessThan': 'ee2216dbdf0c677e89bb43e03247dba590ed00ef', 'versionType': 'git'}, {'status': 'affected', 'version': 'e2f8fbfb8d09c06decde162090fac3ee220aa280', 'lessThan': 'f511807feee7cb29b61bdfa86472c7e9e2e5df94', 'versionType': 'git'}, {'status': 'affected', 'version': 'e2f8fbfb8d09c06decde162090fac3ee220aa280', 'lessThan': '08c600b7e1818539ba5efee4cdb06215c245ca78', 'versionType': 'git'}, {'status': 'affected', 'version': 'e2f8fbfb8d09c06decde162090fac3ee220aa280', 'lessThan': 'b84e002e0df26bbc6cbd3ca01b8212601fe0ae7d', 'versionType': 'git'}, {'status': 'affected', 'version': 'e2f8fbfb8d09c06decde162090fac3ee220aa280', 'lessThan': 'c6c484a7d5bff6b929a86d7ed5130f29834c6a0d', 'versionType': 'git'}, {'status': 'affected', 'version': 'e2f8fbfb8d09c06decde162090fac3ee220aa280', 'lessThan': 'f80add1bfb3425100a325b14f19648e75669a954', 'versionType': 'git'}, {'status': 'affected', 'version': 'e2f8fbfb8d09c06decde162090fac3ee220aa280', 'lessThan': 'e3d9c7160d483fc8f9e225aafad8ecbbc43f3151', 'versionType': 'git'}], 'programFiles': ['fs/smb/client/cifsacl.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.4'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.4', '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': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/smb/client/cifsacl.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: smb: client: mask server-provided mode to 07777 in modefromsid When modefromsid is active, parse_dacl() applies the server-provided sub_auth[2] value from the NFS mode SID to cf_mode without masking to 07777. Apply the correct masking, same as in the read path. Added Reference https://git.kernel.org/stable/c/08c600b7e1818539ba5efee4cdb06215c245ca78 Added Reference https://git.kernel.org/stable/c/5f6f2241034f189c69d4d0b5f8fe24a0c25b0c14 Added Reference https://git.kernel.org/stable/c/b84e002e0df26bbc6cbd3ca01b8212601fe0ae7d Added Reference https://git.kernel.org/stable/c/c6c484a7d5bff6b929a86d7ed5130f29834c6a0d Added Reference https://git.kernel.org/stable/c/e3d9c7160d483fc8f9e225aafad8ecbbc43f3151 Added Reference https://git.kernel.org/stable/c/ee2216dbdf0c677e89bb43e03247dba590ed00ef Added Reference https://git.kernel.org/stable/c/f511807feee7cb29b61bdfa86472c7e9e2e5df94 Added Reference https://git.kernel.org/stable/c/f80add1bfb3425100a325b14f19648e75669a954