222 lines
12 KiB
JSON
222 lines
12 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-37899",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T04:51:23.965Z",
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"datePublished": "2025-05-20T15:21:34.782Z",
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"dateUpdated": "2026-08-05T11:58:10.107Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:58:10.107Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in session logoff\n\nThe sess->user object can currently be in use by another thread, for\nexample if another connection has sent a session setup request to\nbind to the session being free'd. The handler for that connection could\nbe in the smb2_sess_setup function which makes use of sess->user."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - ksmbd is the in-kernel SMB server; both the freeing SMB2 LOGOFF and the racing SMB2 SESSION_SETUP (multichannel bind) are ordinary SMB PDUs delivered over TCP/445 from a remote client. No local access is required.\nAC:L - The attacker controls both sides of the race — they open both TCP connections and choose when to send LOGOFF and the binding SESSION_SETUP — and both paths block on slow ksmbd.mountd IPC round trips (`ksmbd_ipc_login_request()` / `ksmbd_ipc_logout_request()`), giving a very wide window that can be retried indefinitely with fresh sessions.\nPR:L - `smb2_session_logoff()` is gated by `ksmbd_conn_good()` and a successful `ksmbd_session_lookup_all()`, and channel binding requires a non-guest session, so the attacker needs one ordinary unprivileged SMB account (any share user, no admin rights) — matching the kernel CNA scoring of the sibling multichannel session UAFs CVE-2025-22040/22041.\nUI:N - The attacker drives both connections and both SMB requests entirely on their own; no action by any local user or administrator is needed.\nS:U - The corruption stays within the kernel's own memory and security authority — a standard in-kernel use-after-free with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The freed `struct ksmbd_user` holds `name`, `passkey` and `passkey_sz`; after reclaim, `ksmbd_compare_user()` performs a `memcmp` of attacker-chosen length through a dangling pointer (unbounded OOB read usable as an oracle) and `smb2_query_info` FS_OBJECTID copies 16 bytes via `user_passkey(sess->user)` straight into the network response, disclosing kernel memory and the victim's NTLM passkey to the remote client.\nI:H - `set_user_flag(sess->user, KSMBD_USER_FLAG_BAD_PASSWORD)` performs an OR-write into the freed object, and `sess->user->uid`/`->gid` from freed memory drive `smb_inherit_dacl()` and file ownership; combined with heap spraying of the reclaimed slab object this yields a write primitive suitable for control-flow hijack.\nA:H - Dereferencing the freed `ksmbd_user` (and the `sess->user = NULL` store racing other readers) reliably produces kernel oopses, slab corruption, or a panic, taking down the file server."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/smb/server/smb2pdu.c"
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],
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"status": "affected",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"fs/smb/server/smb2pdu.c"
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],
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"versions": [
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{
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"version": "5.15",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.15",
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"status": "unaffected",
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"versionType": "semver"
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},
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"version": "6.1.159",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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"version": "6.6.119",
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"lessThanOrEqual": "6.6.*",
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},
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"version": "6.12.28",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.14.6",
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"lessThanOrEqual": "6.14.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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"version": "6.15",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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"url": "https://sean.heelan.io/2025/05/22/how-i-used-o3-to-find-cve-2025-37899-a-remote-zeroday-vulnerability-in-the-linux-kernels-smb-implementation/"
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