{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53010", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.378Z", "datePublished": "2026-06-24T16:29:21.211Z", "dateUpdated": "2026-08-05T12:32:37.574Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:32:37.574Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in smb2_open during durable reconnect\n\nIn smb2_open, the call to ksmbd_put_durable_fd(fp) drops the reference\nto the durable file descriptor early during the durable reconnect\nprocess. If an error occurs subsequently (eg, ksmbd_iov_pin_rsp fails)\nor a scavenger accesses the file, it leads to a use-after-free when\naccessing fp properties (eg fp->create_time).\n\nMove the single put to the end of the function below err_out2 so fp\nstays valid until smb2_open returns." } ], "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 - ksmbd is an in-kernel SMB server reachable over TCP, and SMB2_CREATE requests are dispatched from network-received SMB packets to smb2_open. The durable reconnect path is therefore remotely reachable over the network.\nAC:L - An attacker can drive the required SMB sequence by creating a durable handle, disconnecting, and sending a durable reconnect request with controlled create contexts. The bug is a use-after-free/lifetime error in the request path, not a race depending on conditions outside the attacker's control.\nPR:N - Although SMB2_CREATE requires a valid session and tree connect, ksmbd supports guest/anonymous users and guest shares, so a reasonable guest-enabled deployment lets an unauthenticated network client satisfy those gates. Scoring uses that highest reasonable exposure.\nUI:N - No victim user action is required once ksmbd is listening and the share is available. The attacker sends SMB protocol messages directly.\nS:U - The vulnerability is in the kernel SMB server and impacts the same kernel/server security authority. It does not cross a VM, IOMMU, or other separate security scope boundary.\nC:H - The bug is a use-after-free of struct ksmbd_file, which contains kernel pointers, file state, IDs, GUIDs, and list links. Kernel UAF memory corruption can be leveraged for information disclosure, so confidentiality impact is high.\nI:H - Use-after-free in kernel heap objects can be exploited through heap shaping and stale pointer reuse to corrupt kernel state or hijack control flow. Integrity impact is therefore high.\nA:H - The stale ksmbd_file can be dereferenced or closed after free on reconnect/error/scavenger paths, which can crash or destabilize the kernel. Availability impact is high." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/server/smb2pdu.c" ], "versions": [ { "version": "c8efcc786146a951091588e5fa7e3c754850cb3c", "lessThan": "ce2e164c1c51c3f7813b80f8c926836e896bcbb3", "status": "affected", "versionType": "git" }, { "version": "c8efcc786146a951091588e5fa7e3c754850cb3c", "lessThan": "97a0cd55283b4e63fd92804da91c8d9896adcad9", "status": "affected", "versionType": "git" }, { "version": "c8efcc786146a951091588e5fa7e3c754850cb3c", "lessThan": "1baff47b81f94f9231c91236aa511420d0e266b9", "status": "affected", "versionType": "git" }, { "version": "8df4bcdb0a4232192b2445256c39b787d58ef14d", "status": "affected", "versionType": "git" }, { "version": "6.6.32", "lessThan": "6.7", "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/server/smb2pdu.c" ], "versions": [ { "version": "6.9", "status": "affected" }, { "version": "0", "lessThan": "6.9", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "6.9", "versionEndExcluding": "6.18.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.0.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.1" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.32" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ce2e164c1c51c3f7813b80f8c926836e896bcbb3" }, { "url": "https://git.kernel.org/stable/c/97a0cd55283b4e63fd92804da91c8d9896adcad9" }, { "url": "https://git.kernel.org/stable/c/1baff47b81f94f9231c91236aa511420d0e266b9" } ], "title": "ksmbd: fix use-after-free in smb2_open during durable reconnect", "x_generator": { "engine": "bippy-1.2.0" } } } }