CVE-2026-31708— smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path
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I. Basic Information for CVE-2026-31708
Vulnerability Information
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Vulnerability Title
smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path smb2_ioctl_query_info() has two response-copy branches: PASSTHRU_FSCTL and the default QUERY_INFO path. The QUERY_INFO branch clamps qi.input_buffer_length to the server-reported OutputBufferLength and then copies qi.input_buffer_length bytes from qi_rsp->Buffer to userspace, but it never verifies that the flexible-array payload actually fits within rsp_iov[1].iov_len. A malicious server can return OutputBufferLength larger than the actual QUERY_INFO response, causing copy_to_user() to walk past the response buffer and expose adjacent kernel heap to userspace. Guard the QUERY_INFO copy with a bounds check on the actual Buffer payload. Use struct_size(qi_rsp, Buffer, qi.input_buffer_length) rather than an open-coded addition so the guard cannot overflow on 32-bit builds.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于smb2_ioctl_query_info()中QUERY_INFO路径未验证响应缓冲区大小，可能导致恶意服务器返回过大的OutputBufferLength导致越界读取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-31708
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Same Patch Batch · Linux · 2026-05-01 · 146 CVEs total
| CVE-2026-43037 | 9.8 CRITICAL | ip6_tunnel: clear skb2->cb[] in ip4ip6_err() |
| CVE-2026-43038 | 9.8 CRITICAL | ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach() |
| CVE-2026-43039 | 9.8 CRITICAL | net: ti: icssg-prueth: fix missing data copy and wrong recycle in ZC RX dispatch |
| CVE-2026-43011 | 9.8 CRITICAL | net/x25: Fix potential double free of skb |
| CVE-2026-31705 | 9.8 CRITICAL | ksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment |
| CVE-2026-31718 | 9.8 CRITICAL | ksmbd: fix use-after-free in __ksmbd_close_fd() via durable scavenger |
| CVE-2026-43048 | 8.8 HIGH | HID: core: Mitigate potential OOB by removing bogus memset() |
| CVE-2026-31739 | 8.8 HIGH | crypto: tegra - Add missing CRYPTO_ALG_ASYNC |
| CVE-2026-31735 | 8.8 HIGH | iommupt: Fix short gather if the unmap goes into a large mapping |
| CVE-2026-31773 | 8.8 HIGH | Bluetooth: SMP: derive legacy responder STK authentication from MITM state |
| CVE-2026-31717 | 8.8 HIGH | ksmbd: validate owner of durable handle on reconnect |
| CVE-2026-43018 | 8.8 HIGH | Bluetooth: hci_event: fix potential UAF in hci_le_remote_conn_param_req_evt |
| CVE-2026-31709 | 8.8 HIGH | smb: client: validate the whole DACL before rewriting it in cifsacl |
| CVE-2026-31706 | 8.8 HIGH | ksmbd: validate num_aces and harden ACE walk in smb_inherit_dacl() |
| CVE-2026-31712 | 8.3 HIGH | ksmbd: require minimum ACE size in smb_check_perm_dacl() |
| CVE-2026-31779 | 8.1 HIGH | wifi: iwlwifi: mvm: fix potential out-of-bounds read in iwl_mvm_nd_match_info_handler() |
| CVE-2026-31771 | 8.1 HIGH | Bluetooth: hci_event: move wake reason storage into validated event handlers |
| CVE-2026-43051 | 8.1 HIGH | HID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq |
| CVE-2026-43019 | 7.8 HIGH | Bluetooth: hci_conn: fix potential UAF in set_cig_params_sync |
| CVE-2026-31772 | 7.8 HIGH | Bluetooth: hci_sync: fix stack buffer overflow in hci_le_big_create_sync |
Showing top 20 of 146 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2026-31708
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