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CVE-2026-72310

HIGHCVSS 8.1/10EPSS 0.22%

Last modified

CVE-2026-72310 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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. EPSS estimates a 0.22% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
8.1/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

EPSS Probability
0.22%

12.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 2b1116bbe898aefdf584838448c6869f69851e0f, < 175357ee0c596cb82054650dfa32fda51ad35aaa; >= 2b1116bbe898aefdf584838448c6869f69851e0f, < dbd126539c098dba3159ce7d34b10b2daddcbd0f; >= 2b1116bbe898aefdf584838448c6869f69851e0f, < 63feb687e89a3a52a31e6e01764117cc500f1974; >= 2b1116bbe898aefdf584838448c6869f69851e0f, < 160045fc943f6c46b227644261252c8a22b8a87a; >= 2b1116bbe898aefdf584838448c6869f69851e0f, < b30771b69eafae750afb7385fbcc3d77ed3f3670; >= 2b1116bbe898aefdf584838448c6869f69851e0f, < 1627e7d5c9b09721a141d07cedb178882f1ded67; >= 2b1116bbe898aefdf584838448c6869f69851e0f, < 1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9; >= 2b1116bbe898aefdf584838448c6869f69851e0f, < a4f27ad055392fa164f5649e89a3637b033c5fcc; 2005c32ec99ee2490e8131b3953f3f212009ffea; >= 5.4.69, < 5.5
LinuxLinux5.5

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-72310?
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.
How severe is CVE-2026-72310?
CVE-2026-72310 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 0.22% probability of exploitation in the next 30 days.
How do I fix CVE-2026-72310?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST