CVE-2026-64257

CVE CVE-2026-64257EUVD EUVD-2026-48969Published 2026-07-25T08:49:09.000ZLast changed 2026-08-05T12:40:19.000ZCVSS 9.1

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: smb: client: reject overlapping data areas in SMB2 responses Commit 53b7c271f06b ("smb: client: restrict implied bcc[0] exemption to responses without data area") restricted the implied bcc[0] length exception to responses without a data area. However, the overlap handling in __smb2_calc_size() clears data_length, which can make an invalid response appear to have no data area and so qualify for the exception. Track data area overlap separately and reject such responses before applying the length compatibility exceptions.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 573e502d14714d2947e22e7eff40ec20a6a44a42 <36bfa52459e45c0d5b668de2f1c91f6dc5c67775; 8d0bbc78046d264bbf6a574ea6f9072258a43e35; b6a381c01e2ac98a48e32ac0f2a45bbadd9e26b0; 53b7c271f06be4dd5cfc8c6ef552a8355c891a7f <8986c932905ea508d66da421eb2eb6e676ace1fe; 7.2-rc3; 5.15.212 <5.16; patch: 0; 5.10.261 <5.11; ceb875a375dedbf51c9425c1d13a2d7a8435c08c <fdafa1e68dc75045b7b617e6e7d2854950804d83; 419ec1b604d7fb60c10aec2dc062371f9fcd4940 <4a9d2657d3e05f6ed09c148cb127b4e58702275f; patch: 7.2-rc4; 31c6312608c60b72a1feb99a5afb680645a3e8a3 <445ece263131780dee273d727a4d6f11934feec7; 6e9d10f62773b99bd927940fd9cbdfe7207e23ff <57cba95f0e97c6f6e45e6731da30aff091bd7460

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Linux — Linux

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