smb3: fix for slab out of bounds on mount to ksmbd
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · High
- Fix status
- Partial Red Hat: 3 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: smb3: fix for slab out of bounds on mount to ksmbd With KASAN enabled, it is possible to get a slab out of bounds during mount to ksmbd due to missing check in parse_server_interfaces() (see below): BUG: KASAN: slab-out-of-bounds in parse_server_interfaces+0x14ee/0x1880 [cifs] Read of size 4 at addr ffff8881433dba98 by task mount/9827 CPU: 5 UID: 0 PID: 9827 Comm: mount Tainted: G OE 6.16.0-rc2-kasan #2 PREEMPT(voluntary) Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE Hardware name: Dell Inc. Precision Tower 3620/0MWYPT, BIOS 2.13.1 06/14/2019 Call Trace: <TASK> dump_stack_lvl+0x9f/0xf0 print_report+0xd1/0x670 __virt_addr_valid+0x22c/0x430 ? parse_server_interfaces+0x14ee/0x1880 [cifs] ? kasan_complete_mode_report_info+0x2a/0x1f0 ? parse_server_interfaces+0x14ee/0x1880 [cifs] kasan_report+0xd6/0x110 parse_server_interfaces+0x14ee/0x1880 [cifs] __asan_report_load_n_noabort+0x13/0x20 parse_server_interfaces+0x14ee/0x1880 [cifs] ? __pfx_parse_server_interfaces+0x10/0x10 [cifs] ? trace_hardirqs_on+0x51/0x60 SMB3_request_interfaces+0x1ad/0x3f0 [cifs] ? __pfx_SMB3_request_interfaces+0x10/0x10 [cifs] ? SMB2_tcon+0x23c/0x15d0 [cifs] smb3_qfs_tcon+0x173/0x2b0 [cifs] ? __pfx_smb3_qfs_tcon+0x10/0x10 [cifs] ? cifs_get_tcon+0x105d/0x2120 [cifs] ? do_raw_spin_unlock+0x5d/0x200 ? cifs_get_tcon+0x105d/0x2120 [cifs] ? __pfx_smb3_qfs_tcon+0x10/0x10 [cifs] cifs_mount_get_tcon+0x369/0xb90 [cifs] ? dfs_cache_find+0xe7/0x150 [cifs] dfs_mount_share+0x985/0x2970 [cifs] ? check_path.constprop.0+0x28/0x50 ? save_trace+0x54/0x370 ? __pfx_dfs_mount_share+0x10/0x10 [cifs] ? __lock_acquire+0xb82/0x2ba0 ? __kasan_check_write+0x18/0x20 cifs_mount+0xbc/0x9e0 [cifs] ? __pfx_cifs_mount+0x10/0x10 [cifs] ? do_raw_spin_unlock+0x5d/0x200 ? cifs_setup_cifs_sb+0x29d/0x810 [cifs] cifs_smb3_do_mount+0x263/0x1990 [cifs]
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 4.18 and later | 5.15.224, 6.1.149, 6.6.103, 6.12.43, 6.15.11, 6.16.2, 6.17 | Patch available | CNA |
- Linux VendorLinux Affected 4.18 and later Fixed in 5.15.224, 6.1.149, 6.6.103, 6.12.43, 6.15.11, 6.16.2, 6.17 Patch available CNA
CPE configurations NVD · 11
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 4.18.1 to before 6.1.149; 6.2 to before 6.6.103; 6.7 to before 6.12.43; 6.13 to before 6.15.11; 6.16 to before 6.16.2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.18:-:*:*:*:*:*:* | 4.18 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.18:rc2:*:*:*:*:*:* | 4.18 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.18:rc3:*:*:*:*:*:* | 4.18 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.18:rc4:*:*:*:*:*:* | 4.18 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.18:rc5:*:*:*:*:*:* | 4.18 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.18:rc6:*:*:*:*:*:* | 4.18 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.18:rc7:*:*:*:*:*:* | 4.18 rc7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.18:rc8:*:*:*:*:*:* | 4.18 rc8 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:* | 6.17 rc1 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.18.1 to before 6.1.149; 6.2 to before 6.6.103; 6.7 to before 6.12.43; 6.13 to before 6.15.11; 6.16 to before 6.16.2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.18:-:*:*:*:*:*:* Versions 4.18 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.18:rc2:*:*:*:*:*:* Versions 4.18 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.18:rc3:*:*:*:*:*:* Versions 4.18 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.18:rc4:*:*:*:*:*:* Versions 4.18 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.18:rc5:*:*:*:*:*:* Versions 4.18 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.18:rc6:*:*:*:*:*:* Versions 4.18 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.18:rc7:*:*:*:*:*:* Versions 4.18 rc7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.18:rc8:*:*:*:*:*:* Versions 4.18 rc8 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:* Versions 6.17 rc1 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.15.224, 6.1.149, 6.6.103, 6.12.43, 6.15.11, 6.16.2, 6.17
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet |
| Red Hat Enterprise Linux 8 | Affected | No fix yet |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
Not affected: 2 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2025-38728
- 2026-10-03 Alias added: GHSA-p6j9-xx79-r863
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-16 Priority changed: LOW → MEDIUM
- 2026-10-16 Affected versions changed · Red Hat
- 2026-10-16 CVSS score changed · Red Hat
- 2026-10-30 Fix available: Linux/Linux@248c1142f09478d6cb8151510cbf4ac2673c8ac5, Linux/[email protected] · CNA
- 2026-10-30 1 new reference · CNA
References
Patch 6
- https://git.kernel.org/stable/c/9bdb8e98a0073c73ab3e6c631ec78877ceb64565
- https://git.kernel.org/stable/c/a0620e1525663edd8c4594f49fb75fe5be4724b0
- https://git.kernel.org/stable/c/8de33d4d72e8fae3502ec3850bd7b14e7c7328b6
- https://git.kernel.org/stable/c/a542f93a123555d09c3ce8bc947f7b56ad8e6463
- https://git.kernel.org/stable/c/f6eda5b0e8f8123564c5b34f5801d63243032eac
- https://git.kernel.org/stable/c/7d34ec36abb84fdfb6632a0f2cbda90379ae21fc
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- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2025-38728 · CVE Program
- CVE-2025-38728 · NVD
- FIRST EPSS
- GHSA-p6j9-xx79-r863 · GitHub Advisory Database · CC BY 4.0
- CVE-2025-38728 · Red Hat security data · CC BY 4.0
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