CVE-2025-38728

smb3: fix for slab out of bounds on mount to ksmbd

HIGH

7.1

CVSS Score

Published: September 4, 2025 at 03:33 PM UTC

Updated: October 19, 2026 at 09:10 PM UTC

3 products affected across 3 vendorsLinux KernelDebian LinuxSIMATIC CN 4100

Using Linux by Linux?

Get instant alerts when new vulnerabilities affect Linux - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

HIGH7.1

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

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]

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux · Debiandrupal

95%

11.0

Linux Kernel · Linux

95%

4.18.1 ≤ v < 6.1.1496.13 ≤ v < 6.15.116.16 ≤ v < 6.16.26.2 ≤ v < 6.6.1036.7 ≤ v < 6.12.434.18 4.18 rc2 4.18 rc3 4.18 rc4 4.18 rc5 4.18 rc6 4.18 rc7 4.18 rc8 6.17 6.17 rc1fe856be475f7cf5ffcde57341d175ce9fd09434b

Vendor states this is fixed in 7d34ec36abb84fdfb6632a0f2cbda90379ae21fc (fixed)

Vendor states this is fixed in 8de33d4d72e8fae3502ec3850bd7b14e7c7328b6 (fixed)

Vendor states this is fixed in 9bdb8e98a0073c73ab3e6c631ec78877ceb64565 (fixed)

Vendor states this is fixed in a0620e1525663edd8c4594f49fb75fe5be4724b0 (fixed)

Vendor states this is fixed in a542f93a123555d09c3ce8bc947f7b56ad8e6463 (fixed)

Vendor states this is fixed in f6eda5b0e8f8123564c5b34f5801d63243032eac (fixed)

Vendor states this is fixed in 4.18 (unaffected)

Vendor states this is fixed in 6.1.149 (unaffected)

Vendor states this is fixed in 6.12.43 (unaffected)

Vendor states this is fixed in 6.15.11 (unaffected)

Vendor states this is fixed in 6.16.2 (unaffected)

Vendor states this is fixed in 6.17 (unaffected)