CVE-2026-68457
Last modified
CVE-2026-68457 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: ksmbd: use opener credentials for FSCTL mutations SET_SPARSE, SET_ZERO_DATA and SET_COMPRESSION operate on an open SMB handle but call VFS xattr, fallocate or fileattr helpers with the current ksmbd worker credentials. Those helpers can revalidate inode permissions, ownership and LSM policy independently of the SMB handle access mask. Run each operation with the credentials captured in the target file when the handle was opened. EPSS estimates a 0.48% chance of exploitation in the next 30 days.
Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: use opener credentials for FSCTL mutations SET_SPARSE, SET_ZERO_DATA and SET_COMPRESSION operate on an open SMB handle but call VFS xattr, fallocate or fileattr helpers with the current ksmbd worker credentials. Those helpers can revalidate inode permissions, ownership and LSM policy independently of the SMB handle access mask. Run each operation with the credentials captured in the target file when the handle was opened. Keep credential handling local to these single-file FSCTLs rather than applying session credentials to the complete IOCTL handler, which also contains handle-less and multi-handle operations.
Metrics
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < a8c18434e1f0d9f7989170bdb0490c0160baf065; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 1e112c47ec5dd1942e2d4ca6e8e9b712238e20c2; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < fb1cae6302d58414ddf029e3f642711bd30243f7; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < e205f3e7e8c31a47cd11efb6cf663a527177e432; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < cfb2c6f71d61ed807c9d7a7af331d406f1f31877; >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < c6394bcaf254c5baf9aff43376020be5db6d3316 |
| Linux | Linux | 5.15 |
References
Timeline
- Published
- Last Modified
- Status
- Received
Frequently Asked Questions
What is CVE-2026-68457?
How severe is CVE-2026-68457?
How do I fix CVE-2026-68457?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-68451In the Linux kernel, the following vulnerability has been re…7.8
- CVE-2026-68452In the Linux kernel, the following vulnerability has been re…7.8
- CVE-2026-68453In the Linux kernel, the following vulnerability has been re…7.1
- CVE-2026-68454In the Linux kernel, the following vulnerability has been re…8.8
- CVE-2026-68455In the Linux kernel, the following vulnerability has been re…
- CVE-2026-68456In the Linux kernel, the following vulnerability has been re…
- CVE-2026-68458In the Linux kernel, the following vulnerability has been re…7.8
- CVE-2026-68459In the Linux kernel, the following vulnerability has been re…
- CVE-2026-6846A flaw was found in binutils. A heap-buffer-overflow vulnera…7.8
- CVE-2026-68460In the Linux kernel, the following vulnerability has been re…
- CVE-2026-68461In the Linux kernel, the following vulnerability has been re…7.8
- CVE-2026-68462In the Linux kernel, the following vulnerability has been re…7.8
Are you affected by CVE-2026-68457?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST