{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64025","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-19T07:54:57.027Z","datePublished":"2026-07-19T15:39:17.178Z","dateUpdated":"2026-08-05T12:38:19.891Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:38:19.891Z"},"descriptions":[{"lang":"en","value":"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()."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"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."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/skmsg.c"],"versions":[{"version":"ef5659280eb13e8ac31c296f58cfdfa1684ac06b","lessThan":"c9ea01768903ae47f210cd457af1dead6de7a9c3","status":"affected","versionType":"git"},{"version":"ef5659280eb13e8ac31c296f58cfdfa1684ac06b","lessThan":"7c8cf21bc4efb4af18d6096db3f8bd06d622251c","status":"affected","versionType":"git"},{"version":"ef5659280eb13e8ac31c296f58cfdfa1684ac06b","lessThan":"1861d369efd62d67796563bf3e01fc22e5626f8b","status":"affected","versionType":"git"},{"version":"ef5659280eb13e8ac31c296f58cfdfa1684ac06b","lessThan":"8a52139560f833c3975032e1f5762611e3a36d71","status":"affected","versionType":"git"},{"version":"ef5659280eb13e8ac31c296f58cfdfa1684ac06b","lessThan":"ddf8029623a1af20e984c040e89ff918158397ab","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/skmsg.c"],"versions":[{"version":"5.10","status":"affected"},{"version":"0","lessThan":"5.10","status":"unaffected","versionType":"semver"},{"version":"6.6.142","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.92","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.34","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.0.11","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.6.142"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.12.92"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.18.34"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"7.0.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"7.1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/c9ea01768903ae47f210cd457af1dead6de7a9c3"},{"url":"https://git.kernel.org/stable/c/7c8cf21bc4efb4af18d6096db3f8bd06d622251c"},{"url":"https://git.kernel.org/stable/c/1861d369efd62d67796563bf3e01fc22e5626f8b"},{"url":"https://git.kernel.org/stable/c/8a52139560f833c3975032e1f5762611e3a36d71"},{"url":"https://git.kernel.org/stable/c/ddf8029623a1af20e984c040e89ff918158397ab"}],"title":"bpf, skmsg: fix verdict sk_data_ready racing with ktls rx","x_generator":{"engine":"bippy-1.2.0"}}}}