ping: Fix potentail NULL deref for /proc/net/icmp.

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  "url": "https://osv.dev/vulnerability/CVE-2023-53987",
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  "payload": {
    "kind": "advisory",
    "title": "ping: Fix potentail NULL deref for /proc/net/icmp.",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ping: Fix potentail NULL deref for /proc/net/icmp. After commit dbca1596bbb0 (\"ping: convert to RCU lookups, get rid of rwlock\"), we use RCU for ping sockets, but we should use spinlock for /proc/net/icmp to avoid a potential NULL deref mentioned in the previous patch. Let's go back to using spinlock there. Note we can convert ping sockets to use hlist instead of hlist_nulls because we do not use SLAB_TYPESAFE_BY_RCU for ping sockets.",
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      "modified": "2026-10-08T02:48:35.375029950Z",
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  "source_id": "core-osv",
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  "published_at": "2025-12-24T10:55:27.032+00:00"
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