ksmbd: fix overflow in dacloffset bounds check
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-190 and the CVSS impact.
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix overflow in dacloffset bounds check The dacloffset field was originally typed as int and used in an unchecked addition, which could overflow and bypass the existing bounds check in both smb_check_perm_dacl() and smb_inherit_dacl(). This could result in out-of-bounds memory access and a kernel crash when dereferencing the DACL pointer. This patch converts dacloffset to unsigned int and uses check_add_overflow() to validate access to the DACL.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 5.15 and later | 5.15.221, 6.1.188, 6.6.157, 6.12.23, 6.13.11, 6.14.2, 6.15 | Patch available | CNA |
- Linux VendorLinux Affected 5.15 and later Fixed in 5.15.221, 6.1.188, 6.6.157, 6.12.23, 6.13.11, 6.14.2, 6.15 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 5.15 to before 6.12.23; 6.13 to before 6.13.11; 6.14 to before 6.14.2 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.15 to before 6.12.23; 6.13 to before 6.13.11; 6.14 to before 6.14.2 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.15.221, 6.1.188, 6.6.157, 6.12.23, 6.13.11, 6.14.2, 6.15
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
Not affected: 5 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2025-22039
- 2026-10-03 Alias added: GHSA-xm3p-r4jv-jxcf
- 2026-11-07 Affected versions changed · Red Hat
References
Patch 4
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Sources
- CVE-2025-22039 · CVE Program
- CVE-2025-22039 · NVD
- FIRST EPSS
- GHSA-xm3p-r4jv-jxcf · GitHub Advisory Database · CC BY 4.0
- CVE-2025-22039 · Red Hat security data · CC BY 4.0
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