{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64257", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.773Z", "datePublished": "2026-07-25T08:49:09.345Z", "dateUpdated": "2026-07-25T08:49:09.345Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-25T08:49:09.345Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: reject overlapping data areas in SMB2 responses\n\nCommit 53b7c271f06b (\"smb: client: restrict implied bcc[0] exemption to\nresponses without data area\") restricted the implied bcc[0] length\nexception to responses without a data area. However, the overlap\nhandling in __smb2_calc_size() clears data_length, which can make an\ninvalid response appear to have no data area and so qualify for the\nexception.\n\nTrack data area overlap separately and reject such responses before\napplying the length compatibility exceptions."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/smb2misc.c"], "versions": [{"version": "31c6312608c60b72a1feb99a5afb680645a3e8a3", "lessThan": "445ece263131780dee273d727a4d6f11934feec7", "status": "affected", "versionType": "git"}, {"version": "573e502d14714d2947e22e7eff40ec20a6a44a42", "lessThan": "36bfa52459e45c0d5b668de2f1c91f6dc5c67775", "status": "affected", "versionType": "git"}, {"version": "419ec1b604d7fb60c10aec2dc062371f9fcd4940", "lessThan": "4a9d2657d3e05f6ed09c148cb127b4e58702275f", "status": "affected", "versionType": "git"}, {"version": "ceb875a375dedbf51c9425c1d13a2d7a8435c08c", "lessThan": "fdafa1e68dc75045b7b617e6e7d2854950804d83", "status": "affected", "versionType": "git"}, {"version": "6e9d10f62773b99bd927940fd9cbdfe7207e23ff", "lessThan": "57cba95f0e97c6f6e45e6731da30aff091bd7460", "status": "affected", "versionType": "git"}, {"version": "53b7c271f06be4dd5cfc8c6ef552a8355c891a7f", "lessThan": "8986c932905ea508d66da421eb2eb6e676ace1fe", "status": "affected", "versionType": "git"}, {"version": "8d0bbc78046d264bbf6a574ea6f9072258a43e35", "status": "affected", "versionType": "git"}, {"version": "b6a381c01e2ac98a48e32ac0f2a45bbadd9e26b0", "status": "affected", "versionType": "git"}, {"version": "5.10.261", "lessThan": "5.11", "status": "affected", "versionType": "semver"}, {"version": "5.15.212", "lessThan": "5.16", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/smb2misc.c"], "versions": [{"version": "7.2-rc3", "status": "affected"}, {"version": "0", "lessThan": "7.2-rc3", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc4", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.2-rc3", "versionEndExcluding": "7.2-rc4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.261"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.212"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/445ece263131780dee273d727a4d6f11934feec7"}, {"url": "https://git.kernel.org/stable/c/36bfa52459e45c0d5b668de2f1c91f6dc5c67775"}, {"url": "https://git.kernel.org/stable/c/4a9d2657d3e05f6ed09c148cb127b4e58702275f"}, {"url": "https://git.kernel.org/stable/c/fdafa1e68dc75045b7b617e6e7d2854950804d83"}, {"url": "https://git.kernel.org/stable/c/57cba95f0e97c6f6e45e6731da30aff091bd7460"}, {"url": "https://git.kernel.org/stable/c/8986c932905ea508d66da421eb2eb6e676ace1fe"}], "title": "smb: client: reject overlapping data areas in SMB2 responses", "x_generator": {"engine": "bippy-1.2.0"}}}}

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