214 lines
11 KiB
JSON
214 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-2024-47675",
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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": "2024-09-30T16:00:12.937Z",
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"datePublished": "2024-10-21T11:53:19.762Z",
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"dateUpdated": "2026-08-05T11:39:21.879Z"
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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": "2026-08-05T11:39:21.879Z"
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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: Fix use-after-free in bpf_uprobe_multi_link_attach()\n\nIf bpf_link_prime() fails, bpf_uprobe_multi_link_attach() goes to the\nerror_free label and frees the array of bpf_uprobe's without calling\nbpf_uprobe_unregister().\n\nThis leaks bpf_uprobe->uprobe and worse, this frees bpf_uprobe->consumer\nwithout removing it from the uprobe->consumers list."
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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 vulnerability is reached only through the local `bpf(BPF_LINK_CREATE)` syscall with a `BPF_TRACE_UPROBE_MULTI` attach type, and the freed memory is subsequently dereferenced by executing a local file. There is no remote or adjacent-network path into `bpf_uprobe_multi_link_attach()`.\nAC:L - The failing condition is `bpf_link_prime()` returning `-EMFILE` from `get_unused_fd_flags()`, which the attacker forces deterministically by exhausting or lowering `RLIMIT_NOFILE` before the call — no race and no uncontrolled state. The attacker also chooses the freed allocation size via `cnt` and triggers the dangling consumer at will by exec'ing their own uprobe'd binary.\nPR:L - Loading the `BPF_PROG_TYPE_KPROBE` program requires `CAP_BPF`+`CAP_PERFMON`, which is a restricted tracing capability set rather than full administrative control, and it is routinely delegated to unprivileged contexts via BPF tokens (bpffs `delegate_cmds`/`delegate_progs`) or granted to non-root observability/container workloads. Such a caller has no other authority over the kernel, so this is low privilege, not high.\nUI:N - The attacker performs every step themselves — attach the multi-uprobe link, force the `bpf_link_prime()` failure, spray the freed slab, then execute their own traced binary to hit the breakpoint. No victim action is required.\nS:U - The use-after-free corrupts kernel heap memory and hijacks kernel control flow within the same kernel security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed `struct bpf_uprobe` array is reclaimed by attacker-sprayed data and then used as a `struct uprobe_consumer` with attacker-controlled `handler`/`next`/`link` pointers, yielding arbitrary kernel-memory read via the resulting indirect calls and `bpf_prog_run()` dereferences. That is full disclosure of kernel memory.\nI:H - The dangling `uc->handler(uc, regs)` call in `handler_chain()` and the `prog->bpf_func()` dispatch reached through the freed `uprobe->link` give control-flow hijack from an attacker-sized, attacker-timed heap object, which is a standard route to arbitrary kernel write and privilege escalation.\nA:H - Even without exploitation, walking the freed consumer list on the next breakpoint hit dereferences poisoned or reused slab memory, producing a KASAN slab-use-after-free and a kernel oops/panic — exactly what syzbot reported. It can be re-triggered at will."
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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": "89ae89f53d201143560f1e9ed4bfa62eee34f88e",
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"lessThan": "790c630ab0e7d7aba6d186581d4627c09fce60f3",
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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": "89ae89f53d201143560f1e9ed4bfa62eee34f88e",
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"lessThan": "7c1d782e5afbf7c50ba74ecc4ddc18a05d63e5ee",
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"status": "affected",
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"lessThan": "cdf27834c3dd5d9abf7eb8e4ee87ee9e307eb25c",
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"lessThan": "5fe6e308abaea082c20fbf2aa5df8e14495622cf",
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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": "6.6",
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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": "6.6",
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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": "6.6.54",
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"lessThanOrEqual": "6.6.*",
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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": "6.10.13",
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"lessThanOrEqual": "6.10.*",
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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": "6.11.2",
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"lessThanOrEqual": "6.11.*",
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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",
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6",
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"versionEndExcluding": "6.6.54"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/790c630ab0e7d7aba6d186581d4627c09fce60f3"
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},
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{
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"url": "https://git.kernel.org/stable/c/7c1d782e5afbf7c50ba74ecc4ddc18a05d63e5ee"
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},
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{
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"url": "https://git.kernel.org/stable/c/cdf27834c3dd5d9abf7eb8e4ee87ee9e307eb25c"
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},
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{
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"url": "https://git.kernel.org/stable/c/5fe6e308abaea082c20fbf2aa5df8e14495622cf"
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}
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],
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"title": "bpf: Fix use-after-free in bpf_uprobe_multi_link_attach()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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"adp": [
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{
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"metrics": [
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{
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"type": "ssvc",
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"content": {
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"id": "CVE-2024-47675",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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],
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"version": "2.0.3",
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"timestamp": "2024-10-21T13:08:07.484678Z"
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}
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],
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"title": "CISA ADP Vulnrichment",
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"dateUpdated": "2024-10-21T13:14:17.530Z"
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} |