{"id":"CVE-2024-36971","state":"PUBLISHED","title":"net: fix __dst_negative_advice() race","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix __dst_negative_advice() race\n\n__dst_negative_advice() does not enforce proper RCU rules when\nsk->dst_cache must be cleared, leading to possible UAF.\n\nRCU rules are that we must first clear sk->sk_dst_cache,\nthen call dst_release(old_dst).\n\nNote that sk_dst_reset(sk) is implementing this protocol correctly,\nwhile __dst_negative_advice() uses the wrong order.\n\nGiven that ip6_negative_advice() has special logic\nagainst RTF_CACHE, this means each of the three ->negative_advice()\nexisting methods must perform the sk_dst_reset() themselves.\n\nNote the check against NULL dst is centralized in\n__dst_negative_advice(), there is no need to duplicate\nit in various callbacks.\n\nMany thanks to Clement Lecigne for tracking this issue.\n\nThis old bug became visible after the blamed commit, using UDP sockets.","publishedAt":"2024-06-10T09:03:23.878Z","updatedAt":"2026-08-05T11:32:22.196Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux 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fix __dst_negative_advice() race","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix __dst_negative_advice() race\n\n__dst_negative_advice() does not enforce proper RCU rules when\nsk->dst_cache must be cleared, leading to possible UAF.\n\nRCU rules are that we must first clear sk->sk_dst_cache,\nthen call dst_release(old_dst).\n\nNote that sk_dst_reset(sk) is implementing this protocol correctly,\nwhile __dst_negative_advice() uses the wrong order.\n\nGiven that ip6_negative_advice() has special logic\nagainst RTF_CACHE, this means each of the three ->negative_advice()\nexisting methods must perform the sk_dst_reset() themselves.\n\nNote the check against NULL dst is centralized in\n__dst_negative_advice(), there is no need to duplicate\nit in various callbacks.\n\nMany thanks to Clement Lecigne for tracking this issue.\n\nThis old bug became visible after the blamed commit, using UDP 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- The race must be driven by two concurrent local socket operations on the same fd — `setsockopt(SO_CNX_ADVICE)` and a lockless `udp_sendmsg()` — so the attacker needs local syscall access. A remote peer can drive only the free side (TCP retransmit timeouts, ICMP-induced PMTU/redirect exceptions), not the racing `sk_dst_cache` writer.\nAC:L - The attacker controls both sides of the race (one thread calling `SO_CNX_ADVICE`, another calling `sendmsg()` on the same connected socket) and can create the required route-exception/obsolete-dst precondition at will, retrying indefinitely across many sockets; in-the-wild exploitation confirms it is reliably winnable.\nPR:L - `SO_CNX_ADVICE` in `sock_setsockopt()` carries no capability check and a connected UDP socket needs no privileges, so any unprivileged local user — including a sandboxed Android app, as in the observed real-world exploit — can reach the code.\nUI:N - Exploitation is entirely self-driven through the attacker's own socket, timers and threads; no victim action is needed.\nS:U - The corrupted `dst_entry` and the resulting code execution are both within the kernel's own security authority — standard local privilege escalation, no VM/IOMMU boundary crossed.\nC:H - The refcount underflow yields a use-after-free on a `dst_entry` whose contents (ops table, metrics, neighbour and function pointers) can be replaced by attacker-sprayed data, giving a kernel read primitive and full disclosure once escalated to root.\nI:H - `dst_entry` holds `ops`, `input()` and `output()` function pointers invoked on every transmit, so reclaiming the freed object gives direct control-flow hijack and arbitrary kernel write — this was weaponized as an in-the-wild Android privilege escalation.\nA:H - Even unweaponized, the premature free and dangling `sk_dst_cache` dereference cause refcount WARNs, memory corruption and kernel oops/panic, and the trigger can be repeated freely by an unprivileged 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