159 lines
9.6 KiB
JSON
159 lines
9.6 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-2023-54303",
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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": "2025-12-30T12:06:44.529Z",
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"datePublished": "2025-12-30T12:23:37.827Z",
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"dateUpdated": "2026-08-05T09:19:03.573Z"
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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": "2026-08-05T09:19:03.573Z"
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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\nbpf: Disable preemption in bpf_perf_event_output\n\nThe nesting protection in bpf_perf_event_output relies on disabled\npreemption, which is guaranteed for kprobes and tracepoints.\n\nHowever bpf_perf_event_output can be also called from uprobes context\nthrough bpf_prog_run_array_sleepable function which disables migration,\nbut keeps preemption enabled.\n\nThis can cause task to be preempted by another one inside the nesting\nprotection and lead eventually to two tasks using same perf_sample_data\nbuffer and cause crashes like:\n\n kernel tried to execute NX-protected page - exploit attempt? (uid: 0)\n BUG: unable to handle page fault for address: ffffffff82be3eea\n ...\n Call Trace:\n ? __die+0x1f/0x70\n ? page_fault_oops+0x176/0x4d0\n ? exc_page_fault+0x132/0x230\n ? asm_exc_page_fault+0x22/0x30\n ? perf_output_sample+0x12b/0x910\n ? perf_event_output+0xd0/0x1d0\n ? bpf_perf_event_output+0x162/0x1d0\n ? bpf_prog_c6271286d9a4c938_krava1+0x76/0x87\n ? __uprobe_perf_func+0x12b/0x540\n ? uprobe_dispatcher+0x2c4/0x430\n ? uprobe_notify_resume+0x2da/0xce0\n ? atomic_notifier_call_chain+0x7b/0x110\n ? exit_to_user_mode_prepare+0x13e/0x290\n ? irqentry_exit_to_user_mode+0x5/0x30\n ? asm_exc_int3+0x35/0x40\n\nFixing this by disabling preemption in bpf_perf_event_output."
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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 code is BPF/uprobe tracing infrastructure reached only by executing code on the machine (hitting an instrumented userspace function via local process execution). There is no remote or adjacent-network entry point.\nAC:L - The attacker controls both racing sides — they run all the threads that hit the uprobe — and can pin them to a single CPU with sched_setaffinity, widen the window with large bpf_perf_event_output payloads, and rely on full preemption being the default on PREEMPT_DYNAMIC distro and Android kernels. Nothing required is outside attacker influence.\nPR:L - In the realistic worst case — a host running a system-wide uprobe/USDT observability agent (bpftrace, BCC, continuous profiler), whose programs use perf_submit()/bpf_perf_event_output by default — any unprivileged local user triggers the corruption merely by executing the instrumented binary concurrently. No capability of the attacker's own is needed.\nUI:N - The attacker's own threads hit the uprobe and generate the preemption; no victim action or interaction is required.\nS:U - The corrupted per-CPU perf_sample_data and the resulting code execution are entirely within the kernel's own security authority, with no crossing into a hypervisor, IOMMU, or other authority.\nC:H - The shared slot leaves data->raw pointing at another task's freed/reused kernel stack, so __output_copy() copies frag->size bytes from an arbitrary frag->data pointer into the mmapped perf ring buffer, yielding arbitrary kernel memory disclosure.\nI:H - __output_custom() performs an indirect call through frag->copy read from a reused kernel stack — confirmed by the \"kernel tried to execute NX-protected page - exploit attempt?\" oops — giving an attacker-sprayable control-flow hijack primitive on top of concurrent writes to a shared perf_sample_data.\nA:H - The commit message documents a reproducible kernel page fault / oops in perf_output_sample, and the race can be re-triggered at will to repeatedly panic the system."
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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/bpf_trace.c"
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],
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"versions": [
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{
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"version": "8c7dcb84e3b744b2b70baa7a44a9b1881c33a9c9",
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"lessThan": "3654ed5daf492463c3faa434c7000d45c2da2ace",
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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": "8c7dcb84e3b744b2b70baa7a44a9b1881c33a9c9",
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"lessThan": "a0ac32cf61e5a76e2429e486925a52ee41dd75e3",
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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": "8c7dcb84e3b744b2b70baa7a44a9b1881c33a9c9",
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"lessThan": "f2c67a3e60d1071b65848efaa8c3b66c363dd025",
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"status": "affected",
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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/bpf_trace.c"
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],
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"versions": [
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{
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"version": "6.0",
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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": "6.0",
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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": "6.1.45",
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"lessThanOrEqual": "6.1.*",
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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": "6.4.10",
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"lessThanOrEqual": "6.4.*",
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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": "6.5",
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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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{
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.0",
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"versionEndExcluding": "6.1.45"
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},
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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": "6.0",
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},
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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": "6.0",
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}
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]
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}
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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/3654ed5daf492463c3faa434c7000d45c2da2ace"
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},
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{
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"url": "https://git.kernel.org/stable/c/a0ac32cf61e5a76e2429e486925a52ee41dd75e3"
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},
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{
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"url": "https://git.kernel.org/stable/c/f2c67a3e60d1071b65848efaa8c3b66c363dd025"
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}
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],
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"title": "bpf: Disable preemption in bpf_perf_event_output",
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}
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} |