CVE-2025-38728 (GCVE-0-2025-38728)
Vulnerability from cvelistv5
Published
2025-09-04 15:33
Modified
2026-08-05 12:04
Severity ?
9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
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]
References
Impacted products
Vendor Product Version
Linux Linux Version: fe856be475f7cf5ffcde57341d175ce9fd09434b
Version: fe856be475f7cf5ffcde57341d175ce9fd09434b
Version: fe856be475f7cf5ffcde57341d175ce9fd09434b
Version: fe856be475f7cf5ffcde57341d175ce9fd09434b
Version: fe856be475f7cf5ffcde57341d175ce9fd09434b
Version: fe856be475f7cf5ffcde57341d175ce9fd09434b
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        "title": "CVE Program Container"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb3: fix for slab out of bounds on mount to ksmbd\n\nWith KASAN enabled, it is possible to get a slab out of bounds\nduring mount to ksmbd due to missing check in parse_server_interfaces()\n(see below):\n\n BUG: KASAN: slab-out-of-bounds in\n parse_server_interfaces+0x14ee/0x1880 [cifs]\n Read of size 4 at addr ffff8881433dba98 by task mount/9827\n\n CPU: 5 UID: 0 PID: 9827 Comm: mount Tainted: G\n OE       6.16.0-rc2-kasan #2 PREEMPT(voluntary)\n Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE\n Hardware name: Dell Inc. Precision Tower 3620/0MWYPT,\n BIOS 2.13.1 06/14/2019\n Call Trace:\n  \u003cTASK\u003e\n dump_stack_lvl+0x9f/0xf0\n print_report+0xd1/0x670\n __virt_addr_valid+0x22c/0x430\n ? parse_server_interfaces+0x14ee/0x1880 [cifs]\n ? kasan_complete_mode_report_info+0x2a/0x1f0\n ? parse_server_interfaces+0x14ee/0x1880 [cifs]\n   kasan_report+0xd6/0x110\n   parse_server_interfaces+0x14ee/0x1880 [cifs]\n   __asan_report_load_n_noabort+0x13/0x20\n   parse_server_interfaces+0x14ee/0x1880 [cifs]\n ? __pfx_parse_server_interfaces+0x10/0x10 [cifs]\n ? trace_hardirqs_on+0x51/0x60\n SMB3_request_interfaces+0x1ad/0x3f0 [cifs]\n ? __pfx_SMB3_request_interfaces+0x10/0x10 [cifs]\n ? SMB2_tcon+0x23c/0x15d0 [cifs]\n smb3_qfs_tcon+0x173/0x2b0 [cifs]\n ? __pfx_smb3_qfs_tcon+0x10/0x10 [cifs]\n ? cifs_get_tcon+0x105d/0x2120 [cifs]\n ? do_raw_spin_unlock+0x5d/0x200\n ? cifs_get_tcon+0x105d/0x2120 [cifs]\n ? __pfx_smb3_qfs_tcon+0x10/0x10 [cifs]\n cifs_mount_get_tcon+0x369/0xb90 [cifs]\n ? dfs_cache_find+0xe7/0x150 [cifs]\n dfs_mount_share+0x985/0x2970 [cifs]\n ? check_path.constprop.0+0x28/0x50\n ? save_trace+0x54/0x370\n ? __pfx_dfs_mount_share+0x10/0x10 [cifs]\n ? __lock_acquire+0xb82/0x2ba0\n ? __kasan_check_write+0x18/0x20\n cifs_mount+0xbc/0x9e0 [cifs]\n ? __pfx_cifs_mount+0x10/0x10 [cifs]\n ? do_raw_spin_unlock+0x5d/0x200\n ? cifs_setup_cifs_sb+0x29d/0x810 [cifs]\n cifs_smb3_do_mount+0x263/0x1990 [cifs]"
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
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              "lang": "en",
              "value": "AV:N - The out-of-bounds offset is the `Next` field of an SMB2 FSCTL_QUERY_NETWORK_INTERFACE_INFO response received over TCP/445 from a remote SMB server, parsed by the in-kernel cifs client. A malicious or compromised SMB server (or MITM on an unsigned session) triggers it purely with network data.\nAC:L - The server directly controls the 32-bit `Next` value and the response length, so it deterministically drives `p` past the end of the kmemdup\u0027d buffer on the first entry; no race, timing, or memory-layout condition outside the attacker\u0027s control is involved.\nPR:N - The attacker is the peer SMB server, which holds no privileges on the victim client \u2014 it is the client that authenticates to the server, not the reverse. No credentials or local account on the target are needed.\nUI:N - Besides the mount path, `SMB3_request_interfaces()` is invoked from the `smb2_query_server_interfaces()` delayed work re-queued every 600 s and from `smb2_reconnect()`; since the server itself advertises the MULTI_CHANNEL capability that schedules that poll and can force a reconnect by dropping the connection, it can trigger the parse repeatedly on a pre-existing mount with no victim action.\nS:U - The invalid read and its consequences stay within the kernel of the affected client host; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The server chooses an arbitrary offset of up to 4 GiB past the response allocation, giving an unbounded wild read of kernel memory rather than a small bounded overread, consistent with kernel.org CNA treatment of cifs client OOB reads (e.g. CVE-2026-31613, CVE-2026-46155).\nI:N - The defect is strictly a read: `bytes_left` goes negative and the loop exits before any out-of-bounds bytes are copied into `tmp_iface` or the interface list, and there is no out-of-bounds write.\nA:H - Dereferencing a pointer up to 4 GiB beyond a slab object readily hits an unmapped direct-map address, producing a kernel oops that kills the mounting or cifsiod worker context (and a KASAN report/panic on hardened kernels); the server can repeat it on every reconnect."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:04:19.517Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9bdb8e98a0073c73ab3e6c631ec78877ceb64565"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0620e1525663edd8c4594f49fb75fe5be4724b0"
        },
        {
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/7d34ec36abb84fdfb6632a0f2cbda90379ae21fc"
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      "title": "smb3: fix for slab out of bounds on mount to ksmbd",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38728",
    "datePublished": "2025-09-04T15:33:26.039Z",
    "dateReserved": "2025-04-16T04:51:24.033Z",
    "dateUpdated": "2026-08-05T12:04:19.517Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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}


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