180 lines
9.8 KiB
JSON
180 lines
9.8 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-2025-37802",
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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": "2025-04-16T04:51:23.941Z",
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"datePublished": "2025-05-08T06:26:03.075Z",
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"dateUpdated": "2026-09-14T11:57:58.953Z"
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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": "2026-09-14T11:57:58.953Z"
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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 WARNING \"do not call blocking ops when !TASK_RUNNING\"\n\nwait_event_timeout() will set the state of the current\ntask to TASK_UNINTERRUPTIBLE, before doing the condition check. This\nmeans that ksmbd_durable_scavenger_alive() will try to acquire the mutex\nwhile already in a sleeping state. The scheduler warns us by giving\nthe following warning:\n\ndo not call blocking ops when !TASK_RUNNING; state=2 set at\n [<0000000061515a6f>] prepare_to_wait_event+0x9f/0x6c0\nWARNING: CPU: 2 PID: 4147 at kernel/sched/core.c:10099 __might_sleep+0x12f/0x160\n\nmutex lock is not needed in ksmbd_durable_scavenger_alive()."
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}
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],
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{
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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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 - The vulnerable code is in ksmbd, the in-kernel SMB server listening on TCP/445, and the trigger is SMB2 SESSION_SETUP / connection teardown traffic from a remote peer. No local access is needed.\nAC:L - The scavenger kthread hits the bad `mutex_lock()`-under-TASK_UNINTERRUPTIBLE on its very first wait, deterministically, whenever a session is destroyed while a durable handle exists; the attacker also controls both sides of the lock contention by churning sessions across parallel connections.\nPR:N - `ksmbd_session_destroy()` — which launches the scavenger — is reached before authentication, via `ksmbd_session_register()`→`ksmbd_expire_session()` reaping a non-VALID (unauthenticated) session and via `ksmbd_sessions_deregister()` on connection close; on guest-mapped shares the attacker can also populate the durable-handle table with no credentials.\nUI:N - Exploitation requires only that the attacker open SMB connections and issue SESSION_SETUP requests; no action by a local user or administrator is needed.\nS:U - The corrupted task state and the resulting warning/spin are confined to the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - There is no out-of-bounds read or use-after-free; the WARN backtrace goes to the kernel log, which is not accessible to the remote attacker.\nI:N - No memory corruption or data modification occurs — the only state damaged is the scavenger kthread's own scheduler state, which does not yield a write primitive.\nA:H - The bug produces a kernel WARNING splat that becomes a full panic under `panic_on_warn`, and the clobbered task state turns the scavenger into a busy loop repeatedly holding `write_lock(&global_ft.lock)`, exhausting a CPU and stalling all SMB file open/close processing."
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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/vfs_cache.c"
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],
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"versions": [
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{
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"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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"status": "affected",
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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/vfs_cache.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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"status": "unaffected",
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},
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{
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"version": "6.6.157",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.12.26",
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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": "6.14.5",
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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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{
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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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"references": [
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{
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"url": "https://git.kernel.org/stable/c/97aabdbf7ba82da20e698f0e62917fb206d42941"
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},
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{
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"url": "https://git.kernel.org/stable/c/8f805b3746d2f41702c77cba22f94f8415fadd1a"
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},
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{
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"url": "https://git.kernel.org/stable/c/cd161198e091e8a62b9bd631be970ea9a87d2d6a"
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},
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{
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"url": "https://git.kernel.org/stable/c/1df0d4c616138784e033ad337961b6e1a6bcd999"
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}
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],
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"title": "ksmbd: fix WARNING \"do not call blocking ops when !TASK_RUNNING\"",
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