252 lines
13 KiB
JSON
252 lines
13 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-2024-40909",
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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": "2024-07-12T12:17:45.580Z",
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"datePublished": "2024-07-12T12:20:48.447Z",
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"dateUpdated": "2026-10-30T12:18:36.759Z"
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},
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-10-30T12:18:36.759Z"
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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 a potential use-after-free in bpf_link_free()\n\nAfter commit 1a80dbcb2dba, bpf_link can be freed by\nlink->ops->dealloc_deferred, but the code still tests and uses\nlink->ops->dealloc afterward, which leads to a use-after-free as\nreported by syzbot. Actually, one of them should be sufficient, so\njust call one of them instead of both. Also add a WARN_ON() in case\nof any problematic implementation."
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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 exclusively through the local `bpf()` syscall — creating a raw_tracepoint/kprobe_multi/uprobe_multi link and then closing its file descriptor. No network or remote-peer data is involved.\nAC:L - The attacker drives the free side directly and can repeat the create/close cycle in an unbounded loop across all CPUs while generating scheduling and RCU load to force preemption between `call_rcu()` and the stale `link->ops` read; syzbot triggered it in practice, so the window is reachable without relying on conditions outside attacker influence.\nPR:L - `bpf_token_capable()` grants BPF/PERFMON at `ns_capable()` level when a BPF token is delegated (kernel/bpf/token.c:17-28), so a process unprivileged in the init namespace inside a container can load these tracing programs and create the affected links; the same path is reachable by ordinary non-root service accounts holding only CAP_BPF+CAP_PERFMON, which is not administrative control of the host.\nUI:N - The entire sequence — link creation and fd close — is performed by the attacker's own process with no action required from any other user.\nS:U - The corruption and its consequences are confined to the kernel's own memory and privilege domain; no hypervisor, IOMMU, or other security-authority boundary is crossed.\nC:H - The use-after-free reads the `ops` pointer out of a freed slab object that the attacker can reallocate and fill via heap spraying, yielding an arbitrary kernel pointer dereference and an arbitrary-read primitive over kernel memory.\nI:H - After the stale `link->ops` read, the code performs `link->ops->dealloc(link)` — an indirect call through an attacker-controlled function pointer table, giving control-flow hijack and full kernel-integrity compromise.\nA:H - Even unweaponized, dereferencing and calling through a freed/recycled `ops` pointer produces a wild indirect branch and immediate kernel oops or panic, and the attacker can trigger it repeatedly."
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}
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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": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"kernel/bpf/syscall.c"
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"status": "affected",
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"status": "affected",
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},
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"version": "1a80dbcb2dbaf6e4c216e62e30fa7d3daa8001ce",
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"version": "6.6.26",
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"lessThan": "6.6.35",
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"status": "affected",
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"versionType": "semver"
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},
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"version": "6.8.5",
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"kernel/bpf/syscall.c"
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],
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"versions": [
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"version": "0",
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"version": "6.6.35",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.9.6",
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"lessThanOrEqual": "6.9.*",
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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",
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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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