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.
Affected versions
Linux kernel versions
5.4.69,
5.5
and later are affected. Fixed in
5.10.261,
5.15.212,
6.1.178,
6.6.145,
6.12.97,
6.18.40,
7.1.5,
7.2-rc3
and their respective stable series.
References
8 totalFrequently asked questions
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What is CVE-2026-72310?
CVE-2026-72310 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.4.69 onward and has been patched in 5.10.261, 5.15.212, 6.1.178 and others. CVE-2026-72310 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-72310?
Yes. CVE-2026-72310 has been patched. Fixed versions include 5.10.261, 5.15.212, 6.1.178 and others. If you are running Linux kernel 5.4.69 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-72310 actively exploited?
No. CVE-2026-72310 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.