443 lines
21 KiB
JSON
443 lines
21 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-2024-56606",
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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": "2024-12-27T14:03:06.013Z",
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"datePublished": "2024-12-27T14:51:11.327Z",
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"dateUpdated": "2026-10-15T00:59:48.866Z"
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},
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"containers": {
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:45:27.108Z"
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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\naf_packet: avoid erroring out after sock_init_data() in packet_create()\n\nAfter sock_init_data() the allocated sk object is attached to the provided\nsock object. On error, packet_create() frees the sk object leaving the\ndangling pointer in the sock object on return. Some other code may try\nto use this pointer and cause use-after-free."
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}
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],
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"metrics": [
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{
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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 purely through the local `socket(AF_PACKET, ...)` syscall path (`__sys_socket` → `__sock_create` → `packet_create`); no network packet or remote peer is involved in triggering it.\nAC:L - The attacker controls both preconditions — they can exhaust percpu/slab memory themselves (mass socket and BPF-map allocation, netns churn) and retry the cheap `socket()` call in an unbounded loop until `alloc_percpu()` fails, and can heap-spray the generic kmalloc cache to reclaim the freed `packet_sock`.\nPR:L - The only gate is `ns_capable(net->user_ns, CAP_NET_RAW)` at af_packet.c:3394, which any unprivileged user satisfies inside a user+network namespace (`unshare -Urn`), and which containers hold by default.\nUI:N - The attacker triggers the entire sequence from their own process via repeated `socket()` calls; no action by any other user or administrator is required.\nS:U - The dangling pointer, the freed object, and the resulting corruption are all within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The use-after-free reads freed slab memory (`atomic64_read(&sk->sk_cookie)` in `__sock_gen_cookie()`), and since `packet_sock` comes from a generic kmalloc cache the attacker can reclaim the object with sprayed content, turning this into a controllable kernel memory disclosure primitive.\nI:H - `__sock_gen_cookie()` performs an `atomic64_cmpxchg()` on the freed object — an 8-byte write into attacker-reclaimed slab memory at a controlled offset, which is a classic stepping stone to control-flow hijack and privilege escalation.\nA:H - Dereferencing the dangling `sock->sk` after `sk_free()` corrupts freed slab memory and reliably produces a KASAN splat, oops, or panic, as shown in the reference report for this bug class."
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}
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]
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}
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"net/packet/af_packet.c"
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],
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"versions": [
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"version": "3.14",
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{
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"version": "0",
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"lessThanOrEqual": "5.4.*",
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},
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{
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"version": "5.10.231",
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"lessThanOrEqual": "5.10.*",
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},
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"type": "ssvc",
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"title": "CVE Program Container",
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"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
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"url": "https://cert-portal.siemens.com/productcert/html/ssa-355557.html"
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