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vuln-cve/data/2025/37xxx/CVE-2025-37923.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-37923",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-04-16T04:51:23.969Z",
"datePublished": "2025-05-20T15:21:51.927Z",
"dateUpdated": "2026-08-05T11:58:24.005Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T11:58:24.005Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix oob write in trace_seq_to_buffer()\n\nsyzbot reported this bug:\n==================================================================\nBUG: KASAN: slab-out-of-bounds in trace_seq_to_buffer kernel/trace/trace.c:1830 [inline]\nBUG: KASAN: slab-out-of-bounds in tracing_splice_read_pipe+0x6be/0xdd0 kernel/trace/trace.c:6822\nWrite of size 4507 at addr ffff888032b6b000 by task syz.2.320/7260\n\nCPU: 1 UID: 0 PID: 7260 Comm: syz.2.320 Not tainted 6.15.0-rc1-syzkaller-00301-g3bde70a2c827 #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:408 [inline]\n print_report+0xc3/0x670 mm/kasan/report.c:521\n kasan_report+0xe0/0x110 mm/kasan/report.c:634\n check_region_inline mm/kasan/generic.c:183 [inline]\n kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189\n __asan_memcpy+0x3c/0x60 mm/kasan/shadow.c:106\n trace_seq_to_buffer kernel/trace/trace.c:1830 [inline]\n tracing_splice_read_pipe+0x6be/0xdd0 kernel/trace/trace.c:6822\n ....\n==================================================================\n\nIt has been reported that trace_seq_to_buffer() tries to copy more data\nthan PAGE_SIZE to buf. Therefore, to prevent this, we should use the\nsmaller of trace_seq_used(&iter->seq) and PAGE_SIZE as an argument."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - Exploitation requires opening `/sys/kernel/tracing/trace_pipe` (or a per-CPU variant) on the local system and issuing `splice(2)` against it. There is no network-facing path to `tracing_splice_read_pipe()`.\nAC:L - The overflow is deterministic and fully attacker-driven: generate more than one page of formatted trace output (a single ~4096-byte `trace_marker` record, or simply let `tracing_fill_pipe_page()` accumulate events up to the 8K trace_seq limit) and then splice from trace_pipe. No race, no memory-layout luck, and no non-default kernel config is needed.\nPR:L - `tracing_open_pipe()` contains no capability check whatsoever — reachability is gated only by DAC on the tracefs inode, and tracefs exposes `uid=`/`gid=`/`mode=` mount parameters precisely so a non-root group can be granted ftrace access. Android grants `shell`/atrace/Perfetto (`AID_READTRACEFS`) access to trace_pipe and distro/CI/observability deployments commonly chgrp the tracing tree, so an unprivileged local account reaches this path.\nUI:N - The attacker performs every step (open, generate trace data, splice) from its own process. No victim action or interaction is required.\nS:U - The out-of-bounds write and disclosure occur within kernel memory under the same security authority as the kernel itself; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Before the fix `spd.partial[i].len` was set to `trace_seq_used()` (up to ~8152) for a 4096-byte page, so `splice_to_pipe()` returns a pipe buffer that lets userspace read roughly 4KB of adjacent kernel memory directly — an arbitrary-content kernel infoleak, on top of the OOB write's exploitability for further disclosure.\nI:H - `trace_seq_to_buffer()` memcpy's up to ~4056 bytes past the end of a freshly allocated order-0 page into adjacent kernel memory, with largely attacker-chosen content (e.g. arbitrary bytes injected via `trace_marker`). A ~4KB controlled linear-map overflow with attacker-groomable neighbours is a strong write primitive suitable for control-flow hijacking.\nA:H - The overflow corrupts whatever kernel memory follows the page, reliably producing KASAN splats, oopses, or panics as reported by syzbot, and it can be re-triggered at will."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
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],
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"status": "affected",
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{
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{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"kernel/trace/trace.c"
],
"versions": [
{
"version": "2.6.30",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.30",
"status": "unaffected",
"versionType": "semver"
},
{
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"lessThanOrEqual": "5.4.*",
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{
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"lessThanOrEqual": "5.10.*",
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},
{
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"lessThanOrEqual": "5.15.*",
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},
{
"version": "6.1.138",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
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},
{
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"lessThanOrEqual": "6.6.*",
"status": "unaffected",
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},
{
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"lessThanOrEqual": "6.12.*",
"status": "unaffected",
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},
{
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"lessThanOrEqual": "6.14.*",
"status": "unaffected",
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},
{
"version": "6.15",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
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"cpeApplicability": [
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"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
{
"url": "https://git.kernel.org/stable/c/f4b0174e9f18aaba59ee6ffdaf8827a7f94eb606"
},
{
"url": "https://git.kernel.org/stable/c/665ce421041890571852422487f4c613d1824ba9"
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{
"url": "https://git.kernel.org/stable/c/1a3f9482b50b74fa9421bff8ceecfefd0dc06f8f"
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{
"url": "https://git.kernel.org/stable/c/f5178c41bb43444a6008150fe6094497135d07cb"
}
],
"title": "tracing: Fix oob write in trace_seq_to_buffer()",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"title": "CVE Program Container",
"references": [
{
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
},
{
"url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"
}
],
"providerMetadata": {
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE",
"dateUpdated": "2025-11-03T19:57:21.994Z"
}
}
]
}
}
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