{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64385","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-19T15:36:31.784Z","datePublished":"2026-07-25T08:50:33.997Z","dateUpdated":"2026-08-17T04:54:37.258Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T04:54:37.258Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix double-free in SMB2_ioctl() replay\n\nA response-bearing attempt can return a replayable error and free its\nresponse buffer. If SMB2_ioctl_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:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"AV:N - An attacker-controlled SMB server can deliver crafted SMB2 IOCTL responses over TCP, including through the kernel's periodic interface-query FSCTL on an existing SMB3 mount.\nAC:L - On a hard or retrans-enabled mount, the server controls replayable statuses, response contents, disconnects, reconnects, and repeated attempts, allowing it to drive both sides of the triggering sequence.\nPR:N - The malicious SMB server needs no account or privilege on the target; victim mounting authority and client authentication do not grant or require attacker-side target privileges.\nUI:N - Once the share is mounted, kernel delayed work can automatically issue the affected FSCTL when the server advertises multichannel support, requiring no user action during exploitation.\nS:U - The memory corruption compromises resources governed by the same host-kernel security authority and does not inherently cross a VM, container, or IOMMU boundary.\nC:H - The response-buffer double-free can corrupt SLUB or mempool state and create dangling or overlapping live buffers, enabling use-after-free exploitation and kernel-memory disclosure.\nI:H - Attacker-controlled network data can overwrite aliased or freed buffers and poison allocator state, supporting arbitrary writes and control-flow hijacking.\nA:H - The duplicate free can trigger an allocator BUG or corrupt kernel heap state, causing an oops, panic, or complete system crash."}]}],"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":"0be4bc64882edaefaaee8d1e27d083643eb778e6","status":"affected","versionType":"git"},{"version":"4f1fffa2376922f3d1d506e49c0fd445b023a28e","lessThan":"96fcfc8ae7359346156e492ca610e830d2649ad6","status":"affected","versionType":"git"},{"version":"4f1fffa2376922f3d1d506e49c0fd445b023a28e","lessThan":"276c8efbc49f9303ac76d0d4deab7128581b0f3b","status":"affected","versionType":"git"},{"version":"4f1fffa2376922f3d1d506e49c0fd445b023a28e","lessThan":"fc65ffb4ef1bf540da16b17c225ae51091e07d72","status":"affected","versionType":"git"},{"version":"4f1fffa2376922f3d1d506e49c0fd445b023a28e","lessThan":"f9bbadb6c94583e3b4af1afc449bfceb1d1ddec9","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/0be4bc64882edaefaaee8d1e27d083643eb778e6"},{"url":"https://git.kernel.org/stable/c/96fcfc8ae7359346156e492ca610e830d2649ad6"},{"url":"https://git.kernel.org/stable/c/276c8efbc49f9303ac76d0d4deab7128581b0f3b"},{"url":"https://git.kernel.org/stable/c/fc65ffb4ef1bf540da16b17c225ae51091e07d72"},{"url":"https://git.kernel.org/stable/c/f9bbadb6c94583e3b4af1afc449bfceb1d1ddec9"}],"title":"smb: client: fix double-free in SMB2_ioctl() replay","x_generator":{"engine":"bippy-1.2.0"}}}}