{ "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" } } } }