Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path… (CVE-2026-31708)
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.
AI Analysis
Technical Summary
The Linux kernel SMB client had a vulnerability in the smb2_ioctl_query_info() function where the QUERY_INFO response-copy path did not properly verify that the flexible-array payload fit within the actual response buffer length. Specifically, the function clamps the input buffer length to the server-reported OutputBufferLength but does not check that the payload fits within the response I/O vector length. A malicious SMB server could exploit this by returning an OutputBufferLength larger than the actual response, causing copy_to_user() to read beyond the buffer boundary and expose adjacent kernel heap memory to userspace. The fix involves adding a bounds check using struct_size() to ensure the copy operation does not overflow, preventing potential information disclosure and system instability. This vulnerability affects linux-hwe-edge kernel versions prior to 6.8.0-1061.64~22.04.1 and related versions as listed. The issue is addressed by official patches provided by Ubuntu in their security notices.
Potential Impact
Successful exploitation allows a remote attacker controlling an SMB server to cause an out-of-bounds read in kernel memory, potentially exposing sensitive kernel heap data to userspace. This can lead to information disclosure and may cause system instability or denial of service. The CVSS 3.1 base score is 8.1, indicating high severity with network attack vector, low attack complexity, no privileges required, user interaction required, unchanged scope, high confidentiality impact, no integrity impact, and high availability impact.
Mitigation Recommendations
An official patch is available and should be applied promptly. Users should update their linux-hwe-edge kernel packages to versions 6.8.0-1061.64~22.04.1 or later as provided by their distribution vendor (e.g., Ubuntu). After updating, a system reboot is required to apply the kernel changes. The vendor advisory (Ubuntu Security Notice USN-8488-1) provides detailed update instructions. No additional mitigations are indicated beyond applying the official fix.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path… (CVE-2026-31708)
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.
CVSS v3.1
Score 8.1high
Affected software
pkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email 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protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel SMB client had a vulnerability in the smb2_ioctl_query_info() function where the QUERY_INFO response-copy path did not properly verify that the flexible-array payload fit within the actual response buffer length. Specifically, the function clamps the input buffer length to the server-reported OutputBufferLength but does not check that the payload fits within the response I/O vector length. A malicious SMB server could exploit this by returning an OutputBufferLength larger than the actual response, causing copy_to_user() to read beyond the buffer boundary and expose adjacent kernel heap memory to userspace. The fix involves adding a bounds check using struct_size() to ensure the copy operation does not overflow, preventing potential information disclosure and system instability. This vulnerability affects linux-hwe-edge kernel versions prior to 6.8.0-1061.64~22.04.1 and related versions as listed. The issue is addressed by official patches provided by Ubuntu in their security notices.
Potential Impact
Successful exploitation allows a remote attacker controlling an SMB server to cause an out-of-bounds read in kernel memory, potentially exposing sensitive kernel heap data to userspace. This can lead to information disclosure and may cause system instability or denial of service. The CVSS 3.1 base score is 8.1, indicating high severity with network attack vector, low attack complexity, no privileges required, user interaction required, unchanged scope, high confidentiality impact, no integrity impact, and high availability impact.
Mitigation Recommendations
An official patch is available and should be applied promptly. Users should update their linux-hwe-edge kernel packages to versions 6.8.0-1061.64~22.04.1 or later as provided by their distribution vendor (e.g., Ubuntu). After updating, a system reboot is required to apply the kernel changes. The vendor advisory (Ubuntu Security Notice USN-8488-1) provides detailed update instructions. No additional mitigations are indicated beyond applying the official fix.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-31708
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 4.0
Threat ID: 6a5b61b42d1edb114c8851fa
Added to database: 07/18/2026, 11:21:24 UTC
Last enriched: 08/01/2026, 04:53:55 UTC
Last updated: 09/14/2026, 22:01:33 UTC
Views: 18
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