246 lines
14 KiB
JSON
246 lines
14 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-2024-35860",
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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": "2024-05-17T13:50:33.107Z",
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"datePublished": "2024-05-19T08:34:19.368Z",
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"dateUpdated": "2026-10-30T12:18:16.969Z"
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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": "2026-10-30T12:18:16.969Z"
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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: support deferring bpf_link dealloc to after RCU grace period\n\nBPF link for some program types is passed as a \"context\" which can be\nused by those BPF programs to look up additional information. E.g., for\nmulti-kprobes and multi-uprobes, link is used to fetch BPF cookie values.\n\nBecause of this runtime dependency, when bpf_link refcnt drops to zero\nthere could still be active BPF programs running accessing link data.\n\nThis patch adds generic support to defer bpf_link dealloc callback to\nafter RCU GP, if requested. This is done by exposing two different\ndeallocation callbacks, one synchronous and one deferred. If deferred\none is provided, bpf_link_free() will schedule dealloc_deferred()\ncallback to happen after RCU GP.\n\nBPF is using two flavors of RCU: \"classic\" non-sleepable one and RCU\ntasks trace one. The latter is used when sleepable BPF programs are\nused. bpf_link_free() accommodates that by checking underlying BPF\nprogram's sleepable flag, and goes either through normal RCU GP only for\nnon-sleepable, or through RCU tasks trace GP *and* then normal RCU GP\n(taking into account rcu_trace_implies_rcu_gp() optimization), if BPF\nprogram is sleepable.\n\nWe use this for multi-kprobe and multi-uprobe links, which dereference\nlink during program run. We also preventively switch raw_tp link to use\ndeferred dealloc callback, as upcoming changes in bpf-next tree expose\nraw_tp link data (specifically, cookie value) to BPF program at runtime\nas well."
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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 solely through the local `bpf()` syscall — `BPF_PROG_LOAD` plus `BPF_LINK_CREATE` for a kprobe_multi/uprobe_multi link, then closing the link fd while the probes fire. No network or remote-peer input is involved anywhere on the path.\nAC:L - The attacker controls both sides of the race: it picks which kernel/user functions are probed (including ones that block, so return-hooks fire arbitrarily late), drives them in a loop across all CPUs, and closes the link fd at will; three independent syzbot reproducers hit it in practice, so no condition outside attacker influence is required.\nPR:L - Creating these links needs CAP_BPF+CAP_PERFMON, which `bpf_token_capable()` grants at `ns_capable()` level to a delegated BPF token inside a container, and which ordinary non-root tracing/observability service accounts routinely hold — that is a low-privileged account, not administrative control of the host.\nUI:N - The whole sequence — load program, create link, trigger the probes, close the fd — happens inside the attacker's own process. No action by any other user or administrator is needed.\nS:U - The use-after-free and everything it corrupts stay inside the kernel's own memory and privilege domain; no hypervisor, IOMMU, or other security-authority boundary is crossed.\nC:H - `bpf_kprobe_multi_cookie()` bsearches the freed `addrs` array and returns `*cookie` from the freed `cookies` allocation directly to the running BPF program, which can exfiltrate it via a map — a read primitive over attacker-sprayed reclaimed slab, and the freed link is fully groomable.\nI:H - `kprobe_multi_link_prog_run()`/`uprobe_prog_run()` load `link->link.prog` out of freed memory and then indirect-call through it via `bpf_prog_run()`, and `fprobe_exit_handler()` calls `fp->exit_handler` from the same freed object — an attacker-controlled function-pointer dispatch giving control-flow hijack and full kernel-integrity compromise.\nA:H - Even without weaponization, dereferencing and calling through the freed link produces a KASAN slab-use-after-free splat and a wild indirect branch — an immediate oops or panic — and the attacker can repeat the create/trigger/close cycle indefinitely."
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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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"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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"include/linux/bpf.h",
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"kernel/bpf/syscall.c",
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"kernel/trace/bpf_trace.c"
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],
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"versions": [
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"lessThan": "ac48dc6ac9240f73bf08d29edf65c2deca93ee5d",
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"status": "affected",
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"status": "affected",
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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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"include/linux/bpf.h",
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"kernel/bpf/syscall.c",
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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": "5.18",
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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": "5.18",
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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": "6.1.191",
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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": "6.6.26",
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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": "6.8.5",
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"lessThanOrEqual": "6.8.*",
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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": "6.9",
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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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"role": "CISA Coordinator",
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