In the Linux kernel, the following vulnerability has been resolved: smb: client: fix overflow in passthrough ioctl bounds check smb2_io…
CVE-2026-72310 · published 15 Aug 2026
How serious is it
- Severity: high, CVSS score 8.1 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-72310?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: 5.5
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/160045fc943f6c46b227644261252c8a22b8a87a
- git.kernel.org/stable/c/1627e7d5c9b09721a141d07cedb178882f1ded67
- git.kernel.org/stable/c/175357ee0c596cb82054650dfa32fda51ad35aaa
- git.kernel.org/stable/c/1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9
- git.kernel.org/stable/c/63feb687e89a3a52a31e6e01764117cc500f1974
- git.kernel.org/stable/c/a4f27ad055392fa164f5649e89a3637b033c5fcc
- git.kernel.org/stable/c/b30771b69eafae750afb7385fbcc3d77ed3f3670
- git.kernel.org/stable/c/dbd126539c098dba3159ce7d34b10b2daddcbd0f
Merged from NVD. Last updated 23 Oct 2026. All vulnerabilities · RSS · JSON