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vuln-cve/data/2025/38xxx/CVE-2025-38460.json
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{
"dataType": "CVE_RECORD",
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"cveId": "CVE-2025-38460",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-04-16T04:51:24.019Z",
"datePublished": "2025-07-25T15:27:38.608Z",
"dateUpdated": "2026-10-15T21:52:16.661Z"
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\natm: clip: Fix potential null-ptr-deref in to_atmarpd().\n\natmarpd is protected by RTNL since commit f3a0592b37b8 (\"[ATM]: clip\ncauses unregister hang\").\n\nHowever, it is not enough because to_atmarpd() is called without RTNL,\nespecially clip_neigh_solicit() / neigh_ops->solicit() is unsleepable.\n\nAlso, there is no RTNL dependency around atmarpd.\n\nLet's use a private mutex and RCU to protect access to atmarpd in\nto_atmarpd()."
}
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"baseScore": 7,
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"value": "AV:L - The race is driven from local context — an ATM socket's ATMARPD_CTRL open/close on one side and local packet transmission over the atm%d CLIP device (clip_start_xmit/clip_neigh_solicit) on the other. Received network packets can only supply one half of the race and give a remote party no influence over the teardown side, so Local is the accurate vector.\nAC:H - Scoring the security-meaningful attacker (unprivileged local user), the exploit requires being inside to_atmarpd() exactly while atmarpd_close() NULLs and frees the daemon's vcc — the daemon teardown is a system condition that an unprivileged attacker cannot induce, even though they can hammer the trigger path continuously.\nPR:L - No privileges are needed to reach the vulnerable function: any local user sending IP traffic to unresolved addresses on a configured CLIP interface drives clip_start_xmit()/clip_neigh_solicit() → to_atmarpd(). Only the administrative setup (SIOCMKCLIP/ATMARPD_CTRL, capable(CAP_NET_ADMIN)) is privileged, and that is the pre-existing deployment, not the attack.\nUI:N - No victim action is required — the attacker's own traffic triggers the vulnerable path, and the daemon-teardown condition is accounted for in Attack Complexity rather than user interaction.\nS:U - Both the flaw and its impact are confined to the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Winning the race leaves the racing thread operating on a freed struct atm_vcc/sock allocated from the generic kmalloc caches, and a use-after-free of a sprayable sock object can be leveraged to read kernel memory.\nI:H - The stale pointer is used for an atomic_add() write, an skb_queue_tail() list insertion into freed memory, and an indirect call through the freed sock's sk_data_ready() — a write primitive plus control-flow hijack after heap grooming.\nA:H - The minimum outcome is a kernel oops — a NULL (or freed) sock dereference in atm_force_charge()/skb_queue_tail() and a call through a NULL/garbage sk_data_ready pointer — panicking the system."
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"title": "atm: clip: Fix potential null-ptr-deref in to_atmarpd().",
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