{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-38325", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:24.004Z", "datePublished": "2025-07-10T08:14:59.544Z", "dateUpdated": "2026-08-05T12:01:09.621Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:01:09.621Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: add free_transport ops in ksmbd connection\n\nfree_transport function for tcp connection can be called from smbdirect.\nIt will cause kernel oops. This patch add free_transport ops in ksmbd\nconnection, and add each free_transports for tcp and smbdirect." } ], "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 - The vulnerable teardown path belongs to ksmbd's in-kernel SMB Direct transport, whose RDMA CM listener accepts connections from remote peers on port 445 (InfiniBand) / 5445 (iWARP), and is reachable over routable IP via iWARP/RoCEv2 or software providers (siw/rxe). No local access is needed — a remote peer triggers it by establishing and dropping an SMB Direct connection.\nAC:L - The type confusion is deterministic — every SMB Direct connection teardown funnels through ksmbd_conn_free() → ksmbd_free_transport() and fabricates a socket pointer from the status/full_packet_received bytes, with no race or memory-layout precondition. The premature-free variant simply requires holding an oplock/lease at disconnect time, which the attacker fully controls.\nPR:N - Connection setup and teardown happen entirely before SMB2 SESSION_SETUP: the error path in smb_direct_handle_connect_request() and the normal ksmbd_conn_handler_loop() exit both call free_transport() with no credentials verified. An unauthenticated peer that connects and disconnects triggers the confused free.\nUI:N - The attacker drives the entire sequence by opening and closing an SMB Direct connection; no action by any local user or administrator is required beyond ksmbd already serving SMB Direct.\nS:U - The corruption is confined to kernel memory managed by the ksmbd server within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The type confusion plus the unconditional kfree(t) in the RDMA free_transport() leave conn->transport dangling and double-free the slab object, giving a use-after-free on a large kmalloc allocation that an attacker can reclaim and read back through ksmbd_conn_write()/rdma_read paths, which is leverageable for arbitrary kernel memory disclosure.\nI:H - This is a genuine type confusion combined with a double free and a use-after-free whose reuse ends in an indirect call through freed memory (conn->transport->ops->writev in __smb2_lease_break_noti()), a direct control-flow hijack primitive once the freed object is groomed.\nA:H - Every SMB Direct teardown calls sock_release() on a fabricated pointer built from the status enum, producing a guaranteed kernel oops that kills the ksmbd kthread and leaks its RDMA resources, and panics outright on panic_on_oops configurations common in appliances and embedded deployments." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/server/connection.c", "fs/smb/server/connection.h", "fs/smb/server/transport_rdma.c", "fs/smb/server/transport_tcp.c" ], "versions": [ { "version": "1da8bd9a10ecd718692732294d15fd801c0eabb5", "lessThan": "52f5a52dc17a4a7b4363ac03fe2c4ef26f020dc6", "status": "affected", "versionType": "git" }, { "version": "1aec4d14cf81b7b3e7b69eb1cfa94144eed7138e", "lessThan": "3890da762a66191c440b0bd6e3ee45501edbb0c1", "status": "affected", "versionType": "git" }, { "version": "21a4e47578d44c6b37c4fc4aba8ed7cc8dbb13de", "lessThan": "3f3aae77280aad9f5acc6709c596148966f765c7", "status": "affected", "versionType": "git" }, { "version": "21a4e47578d44c6b37c4fc4aba8ed7cc8dbb13de", "lessThan": "a89f5fae998bdc4d0505306f93844c9ae059d50c", "status": "affected", "versionType": "git" }, { "version": "e59796fc80603bcd8569d4d2e10b213c1918edb4", "status": "affected", "versionType": "git" }, { "version": "6.12.26", "lessThan": "6.12.35", "status": "affected", "versionType": "semver" }, { "version": "6.14.4", "lessThan": "6.15", "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/connection.c", "fs/smb/server/connection.h", "fs/smb/server/transport_rdma.c", "fs/smb/server/transport_tcp.c" ], "versions": [ { "version": "6.15", "status": "affected" }, { "version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.35", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.15.4", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16", "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": "6.12.26", "versionEndExcluding": "6.12.35" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "6.15.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "6.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14.4" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/52f5a52dc17a4a7b4363ac03fe2c4ef26f020dc6" }, { "url": "https://git.kernel.org/stable/c/3890da762a66191c440b0bd6e3ee45501edbb0c1" }, { "url": "https://git.kernel.org/stable/c/3f3aae77280aad9f5acc6709c596148966f765c7" }, { "url": "https://git.kernel.org/stable/c/a89f5fae998bdc4d0505306f93844c9ae059d50c" } ], "title": "ksmbd: add free_transport ops in ksmbd connection", "x_generator": { "engine": "bippy-1.2.0" } } } }