{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64025",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64025"
  ],
  "published": "2026-07-19T15:41:06Z",
  "summary": "bpf, skmsg: fix verdict sk_data_ready racing with ktls rx",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, skmsg: fix verdict sk_data_ready racing with ktls rx\n\nsk_psock_strp_data_ready() already checks tls_sw_has_ctx_rx() and\ndefers to psock->saved_data_ready when a TLS RX context is present,\navoiding a conflict with the TLS strparser's ownership of the receive\nqueue (commit e91de6afa81c, \"bpf: Fix running sk_skb program types\nwith ktls\").\n\nsk_psock_verdict_data_ready() has no equivalent guard.  When a socket\nis inserted into a sockmap (BPF_SK_SKB_VERDICT) before TLS RX is\nconfigured, tls_sw_strparser_arm() saves sk_psock_verdict_data_ready\nas rx_ctx->saved_data_ready.  On data arrival:\n\n  tls_data_ready -> tls_strp_data_ready -> tls_rx_msg_ready\n    -> saved_data_ready() = sk_psock_verdict_data_ready()\n      -> tcp_read_skb() drains sk_receive_queue via __skb_unlink()\n         without calling tcp_eat_skb(), so copied_seq is not advanced.\n\ntls_strp_msg_load() then finds tcp_inq() >= full_len (stale), calls\ntcp_recv_skb() on the now-empty queue, hits WARN_ON_ONCE(!first), and\nreturns with rx_ctx->strp.anchor.frag_list pointing at a psock-owned\n(potentially freed) skb.  tls_decrypt_sg() subsequently walks that\nfrag_list: use-after-free.\n\nApply the same fix as sk_psock_strp_data_ready(): if a TLS RX context\nis present, call psock->saved_data_ready (sock_def_readable) to wake\nrecv() waiters and return immediately, leaving the receive queue\nuntouched.  TLS retains sole ownership of the queue and decrypts the\nrecord normally through tls_sw_recvmsg().",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64025"
    },
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    "upstream_modified": "2026-08-05T13:16:28Z",
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      "scenario": "AV:N - The UAF is triggered on the kTLS software RX path when a remote TLS peer sends TCP data; inbound network packets drive tls_data_ready through to sk_psock_verdict_data_ready and tls_decrypt_sg on internet-facing eBPF/kTLS proxy servers.\nAC:L - Once the sockmap-before-TLS-RX configuration exists, the bug fires deterministically on the first arriving TLS record; the attacker controls packet delivery and timing without needing to win an uncontrollable race.\nPR:N - A remote unauthenticated TLS client needs no privileges on the victim host to trigger the bug on a server already running BPF sockmap verdict with kTLS RX; local exploitation via user namespaces only raises the bar to CAP_NET_ADMIN/CAP_BPF (PR:L), not higher.\nUI:N - Exploitation requires only sending TLS traffic to a vulnerable socket; no victim user action such as opening files or mounting filesystems is needed.\nS:U - Impact is kernel heap corruption within the host kernel security boundary; it does not inherently cross VM, container, or IOMMU isolation boundaries without separate escalation.\nC:H - The bug is a use-after-free where tls_decrypt_sg() walks a dangling skb frag_list via skb_to_sgvec/skb_copy_bits, enabling arbitrary kernel memory read primitives from attacker-influenced freed heap objects.\nI:H - Heap UAF over sk_buff structures in the TLS decrypt path can be leveraged for arbitrary kernel memory writes and control-flow hijacking, not merely a bounded or transient corruption.\nA:H - The failure path hits WARN_ON_ONCE in tls_strp_load_anchor_with_queue and the UAF in tls_decrypt_sg can cause kernel oops, panic, or crash during softirq TLS receive processing."
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}