192 lines
11 KiB
JSON
192 lines
11 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-2025-37845",
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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": "2025-04-16T04:51:23.953Z",
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"datePublished": "2025-05-09T06:41:54.022Z",
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"dateUpdated": "2026-08-05T11:57:48.902Z"
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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": "2026-08-05T11:57:48.902Z"
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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\ntracing: fprobe events: Fix possible UAF on modules\n\nCommit ac91052f0ae5 (\"tracing: tprobe-events: Fix leakage of module\nrefcount\") moved try_module_get() from __find_tracepoint_module_cb()\nto find_tracepoint() caller, but that introduced a possible UAF\nbecause the module can be unloaded before try_module_get(). In this\ncase, the module object should be freed too. Thus, try_module_get()\ndoes not only fail but may access to the freed object.\n\nTo avoid that, try_module_get() in __find_tracepoint_module_cb()\nagain."
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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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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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:L - The vulnerable path is reached only by writing a tracepoint probe definition to the tracefs `dynamic_events` file (`trace_fprobe_create()` → `find_tracepoint()`), which requires local access to the machine. There is no network-facing consumer of this code.\nAC:L - The attacker drives both sides of the race — repeatedly issuing `t:` tprobe creations while causing module load/unload churn — and the operation can be retried indefinitely at no cost until the window between `mutex_unlock()` in `for_each_module_tracepoint()` and `try_module_get()` is hit. `CONFIG_FPROBE_EVENTS` is `default y`, so no rare configuration is required.\nPR:L - Exploitation needs write access to the tracefs `dynamic_events` interface, which is routinely delegated to non-root tracing/debug accounts and groups (Android shell/system, ChromeOS debugd, perf/tracing groups, container debug sidecars) rather than being an exclusively root-only capability. No credential check exists in the code path itself beyond file permissions.\nUI:N - The attacker performs the tracefs write and the concurrent module operations entirely on their own; no victim action or interaction is needed.\nS:U - The use-after-free corrupts kernel memory within the same security authority as the kernel itself; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The stale `struct module` and the stale tracepoint structure are read after being freed, and if the freed region is reclaimed by attacker-sprayed allocations the resulting values (`probestub` address, funcname resolved via `kallsyms_lookup()`) feed back into observable state, giving a path to kernel memory disclosure.\nI:H - `try_module_get()` performs an atomic increment into freed memory, and a \"successful\" get lets the code register a tracepoint probe and an ftrace hook using function pointers read out of freed, reclaimable memory — a write plus control-flow-hijack primitive.\nA:H - Touching the freed module allocation (vmalloc-backed, so frequently unmapped on free) produces an immediate oops or panic, and the subsequent probe registration on freed tracepoint data reliably destabilizes the kernel."
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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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"kernel/trace/trace_fprobe.c"
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],
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"versions": [
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{
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"version": "71c9cf87776eaa556fc0a0a060df94200e1f521c",
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"lessThan": "868df4eb784c3ccc7e4340a9ea993cbbedca167e",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9db2b8cf4ea07b579db588e0353d5680f5d1f071",
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"lessThan": "a27d2de2472b1cc7d582ab405d1d5832a80481de",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "ac91052f0ae5be9e46211ba92cc31c0e3b0a933a",
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"lessThan": "626f01f4d26e8cf92e69c1df53036153c8e98a20",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "ac91052f0ae5be9e46211ba92cc31c0e3b0a933a",
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"lessThan": "dd941507a9486252d6fcf11814387666792020f3",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "6.12.21",
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"lessThan": "6.12.24",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.13.9",
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"lessThan": "6.13.12",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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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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"programFiles": [
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"kernel/trace/trace_fprobe.c"
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],
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"versions": [
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{
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"version": "6.14",
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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": "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": "6.12.24",
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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": "6.13.12",
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"lessThanOrEqual": "6.13.*",
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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": "6.14.3",
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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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}
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]
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}
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],
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"cpeApplicability": [
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"nodes": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.12.21",
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"versionEndExcluding": "6.12.24"
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},
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/868df4eb784c3ccc7e4340a9ea993cbbedca167e"
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},
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{
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"url": "https://git.kernel.org/stable/c/a27d2de2472b1cc7d582ab405d1d5832a80481de"
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},
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{
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"url": "https://git.kernel.org/stable/c/626f01f4d26e8cf92e69c1df53036153c8e98a20"
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},
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{
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"url": "https://git.kernel.org/stable/c/dd941507a9486252d6fcf11814387666792020f3"
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}
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],
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"title": "tracing: fprobe events: Fix possible UAF on modules",
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