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8.1
HIGH CVSS 3.1
CVE-2026-72310
smb: client: fix overflow in passthrough ioctl bounds check
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix overflow in passthrough ioctl bounds check smb2_ioctl_query_info() validates the PASSTHRU_FSCTL response payload before copying it to userspace. The payload offset and length both come from 32-bit fields. The bounds check currently adds OutputOffset and qi.input_buffer_length directly, so the addition can wrap in 32-bit arithmetic before the result is compared against the response buffer length. A malicious server can use a large OutputOffset and a small OutputCount to make the wrapped sum pass the bounds check. The later copy_to_user() then reads from io_rsp + OutputOffset, outside the response buffer. Use size_add() for the offset plus length check so overflow is treated as out of bounds.

Details
INFO

Published Date :

Aug. 15, 2026, 6:22 a.m.

Last Modified :

Aug. 17, 2026, 6:18 a.m.

Remotely Exploit :

Yes !

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-72310 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
Fix an integer overflow in a bounds check to prevent memory corruption.
  • Update the Linux kernel.
  • Ensure size_add() is used for offset and length checks.
  • Validate all user-supplied data rigorously.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-72310.

URL Resource
https://git.kernel.org/stable/c/160045fc943f6c46b227644261252c8a22b8a87a
https://git.kernel.org/stable/c/1627e7d5c9b09721a141d07cedb178882f1ded67
https://git.kernel.org/stable/c/175357ee0c596cb82054650dfa32fda51ad35aaa
https://git.kernel.org/stable/c/1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9
https://git.kernel.org/stable/c/63feb687e89a3a52a31e6e01764117cc500f1974
https://git.kernel.org/stable/c/a4f27ad055392fa164f5649e89a3637b033c5fcc
https://git.kernel.org/stable/c/b30771b69eafae750afb7385fbcc3d77ed3f3670
https://git.kernel.org/stable/c/dbd126539c098dba3159ce7d34b10b2daddcbd0f
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-72310 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-72310 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-72310 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-72310 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 17, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
    Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': '175357ee0c596cb82054650dfa32fda51ad35aaa', 'versionType': 'git'}, {'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': 'dbd126539c098dba3159ce7d34b10b2daddcbd0f', 'versionType': 'git'}, {'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': '63feb687e89a3a52a31e6e01764117cc500f1974', 'versionType': 'git'}, {'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': '160045fc943f6c46b227644261252c8a22b8a87a', 'versionType': 'git'}, {'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': 'b30771b69eafae750afb7385fbcc3d77ed3f3670', 'versionType': 'git'}, {'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': '1627e7d5c9b09721a141d07cedb178882f1ded67', 'versionType': 'git'}, {'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': '1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9', 'versionType': 'git'}, {'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': 'a4f27ad055392fa164f5649e89a3637b033c5fcc', 'versionType': 'git'}, {'status': 'affected', 'version': '2005c32ec99ee2490e8131b3953f3f212009ffea', 'versionType': 'git'}, {'status': 'affected', 'version': '5.4.69', 'lessThan': '5.5', 'versionType': 'semver'}], 'programFiles': ['fs/smb/client/smb2ops.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.5'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.5', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/smb/client/smb2ops.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': '175357ee0c596cb82054650dfa32fda51ad35aaa', 'versionType': 'git'}, {'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': 'dbd126539c098dba3159ce7d34b10b2daddcbd0f', 'versionType': 'git'}, {'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': '63feb687e89a3a52a31e6e01764117cc500f1974', 'versionType': 'git'}, {'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': '160045fc943f6c46b227644261252c8a22b8a87a', 'versionType': 'git'}, {'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': 'b30771b69eafae750afb7385fbcc3d77ed3f3670', 'versionType': 'git'}, {'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': '1627e7d5c9b09721a141d07cedb178882f1ded67', 'versionType': 'git'}, {'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': '1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9', 'versionType': 'git'}, {'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': 'a4f27ad055392fa164f5649e89a3637b033c5fcc', 'versionType': 'git'}, {'status': 'affected', 'version': '2005c32ec99ee2490e8131b3953f3f212009ffea', 'versionType': 'git'}, {'status': 'affected', 'version': '5.4.69', 'lessThan': '5.5', 'versionType': 'semver'}], 'programFiles': ['fs/smb/client/smb2ops.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.5'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.5', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/smb/client/smb2ops.c'], 'defaultStatus': 'affected'}]
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 15, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': '175357ee0c596cb82054650dfa32fda51ad35aaa', 'versionType': 'git'}, {'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': 'dbd126539c098dba3159ce7d34b10b2daddcbd0f', 'versionType': 'git'}, {'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': '63feb687e89a3a52a31e6e01764117cc500f1974', 'versionType': 'git'}, {'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': '160045fc943f6c46b227644261252c8a22b8a87a', 'versionType': 'git'}, {'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': 'b30771b69eafae750afb7385fbcc3d77ed3f3670', 'versionType': 'git'}, {'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': '1627e7d5c9b09721a141d07cedb178882f1ded67', 'versionType': 'git'}, {'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': '1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9', 'versionType': 'git'}, {'status': 'affected', 'version': '2b1116bbe898aefdf584838448c6869f69851e0f', 'lessThan': 'a4f27ad055392fa164f5649e89a3637b033c5fcc', 'versionType': 'git'}, {'status': 'affected', 'version': '2005c32ec99ee2490e8131b3953f3f212009ffea', 'versionType': 'git'}, {'status': 'affected', 'version': '5.4.69', 'lessThan': '5.5', 'versionType': 'semver'}], 'programFiles': ['fs/smb/client/smb2ops.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.5'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.5', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/smb/client/smb2ops.c'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: smb: client: fix overflow in passthrough ioctl bounds check smb2_ioctl_query_info() validates the PASSTHRU_FSCTL response payload before copying it to userspace. The payload offset and length both come from 32-bit fields. The bounds check currently adds OutputOffset and qi.input_buffer_length directly, so the addition can wrap in 32-bit arithmetic before the result is compared against the response buffer length. A malicious server can use a large OutputOffset and a small OutputCount to make the wrapped sum pass the bounds check. The later copy_to_user() then reads from io_rsp + OutputOffset, outside the response buffer. Use size_add() for the offset plus length check so overflow is treated as out of bounds.
    Added Reference https://git.kernel.org/stable/c/160045fc943f6c46b227644261252c8a22b8a87a
    Added Reference https://git.kernel.org/stable/c/1627e7d5c9b09721a141d07cedb178882f1ded67
    Added Reference https://git.kernel.org/stable/c/175357ee0c596cb82054650dfa32fda51ad35aaa
    Added Reference https://git.kernel.org/stable/c/1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9
    Added Reference https://git.kernel.org/stable/c/63feb687e89a3a52a31e6e01764117cc500f1974
    Added Reference https://git.kernel.org/stable/c/a4f27ad055392fa164f5649e89a3637b033c5fcc
    Added Reference https://git.kernel.org/stable/c/b30771b69eafae750afb7385fbcc3d77ed3f3670
    Added Reference https://git.kernel.org/stable/c/dbd126539c098dba3159ce7d34b10b2daddcbd0f
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 8.1
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact