{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64382", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.784Z", "datePublished": "2026-07-25T08:50:31.937Z", "dateUpdated": "2026-08-17T04:54:33.945Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:54:33.945Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix double-free in SMB2_open() replay\n\nA response-bearing attempt can return a replayable error and free its\nresponse buffer. If SMB2_open_init() fails before the next send, cleanup\nretains the previous buffer type and frees that response again.\n\nReset response bookkeeping before each attempt to prevent the stale free." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - A malicious SMB2/SMB3 server can trigger the flaw through network-delivered CREATE error responses after a victim mounts or accesses its share.\nAC:L - The server controls the replayable status and can disconnect or refuse reconnection so the next initialization fails; it can repeat the sequence to overcome scheduling variance.\nPR:N - The attacking server needs no account or privileges on the client, because the victim supplies the mounted SMB session and initiates the request.\nUI:R - A victim must mount the malicious share or perform an operation such as statfs, ACL access, notification, or file access that causes SMB2_open() to run.\nS:U - The double-free corrupts memory within the client kernel's existing security authority and does not inherently cross a VM or IOMMU boundary.\nC:H - The double-free can produce overlapping live SMB buffers and use-after-free access, supporting kernel-memory disclosure and arbitrary-read exploitation.\nI:H - Reallocation of the freed mempool object permits attacker-controlled network data to corrupt live kernel objects or allocator metadata, enabling arbitrary writes or control-flow hijacking.\nA:H - The double-free can immediately trigger allocator diagnostics or heap corruption leading to a kernel oops or panic, and the server can repeatedly retrigger it." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/client/smb2pdu.c" ], "versions": [ { "version": "433042a91f9373241307725b52de573933ffedbf", "lessThan": "02bc2896bdc3e29362d6e40d404006944a159c25", "status": "affected", "versionType": "git" }, { "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "3196b5192f246df4272072f61a2f4a3e9967f55d", "status": "affected", "versionType": "git" }, { "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "14498ff5ce0f272ce0ef988721413e06b7038972", "status": "affected", "versionType": "git" }, { "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "ff2d30927bc3bf3c629f0768d2068096e64ef5ce", "status": "affected", "versionType": "git" }, { "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "b55e182f2324bc6a604c21a47aa6c448f719a532", "status": "affected", "versionType": "git" }, { "version": "6.6.32", "lessThan": "6.6.145", "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/smb2pdu.c" ], "versions": [ { "version": "6.8", "status": "affected" }, { "version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "6.6.32", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.12.96" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.18.39" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.1.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/02bc2896bdc3e29362d6e40d404006944a159c25" }, { "url": "https://git.kernel.org/stable/c/3196b5192f246df4272072f61a2f4a3e9967f55d" }, { "url": "https://git.kernel.org/stable/c/14498ff5ce0f272ce0ef988721413e06b7038972" }, { "url": "https://git.kernel.org/stable/c/ff2d30927bc3bf3c629f0768d2068096e64ef5ce" }, { "url": "https://git.kernel.org/stable/c/b55e182f2324bc6a604c21a47aa6c448f719a532" } ], "title": "smb: client: fix double-free in SMB2_open() replay", "x_generator": { "engine": "bippy-1.2.0" } } } }