FKIE_CVE-2026-64025

Vulnerability from fkie_nvd - Published: 2026-07-19 16:17 - Updated: 2026-07-20 15:17
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf, skmsg: fix verdict sk_data_ready racing with ktls rx sk_psock_strp_data_ready() already checks tls_sw_has_ctx_rx() and defers to psock->saved_data_ready when a TLS RX context is present, avoiding a conflict with the TLS strparser's ownership of the receive queue (commit e91de6afa81c, "bpf: Fix running sk_skb program types with ktls"). sk_psock_verdict_data_ready() has no equivalent guard. When a socket is inserted into a sockmap (BPF_SK_SKB_VERDICT) before TLS RX is configured, tls_sw_strparser_arm() saves sk_psock_verdict_data_ready as rx_ctx->saved_data_ready. On data arrival: tls_data_ready -> tls_strp_data_ready -> tls_rx_msg_ready -> saved_data_ready() = sk_psock_verdict_data_ready() -> tcp_read_skb() drains sk_receive_queue via __skb_unlink() without calling tcp_eat_skb(), so copied_seq is not advanced. tls_strp_msg_load() then finds tcp_inq() >= full_len (stale), calls tcp_recv_skb() on the now-empty queue, hits WARN_ON_ONCE(!first), and returns with rx_ctx->strp.anchor.frag_list pointing at a psock-owned (potentially freed) skb. tls_decrypt_sg() subsequently walks that frag_list: use-after-free. Apply the same fix as sk_psock_strp_data_ready(): if a TLS RX context is present, call psock->saved_data_ready (sock_def_readable) to wake recv() waiters and return immediately, leaving the receive queue untouched. TLS retains sole ownership of the queue and decrypts the record normally through tls_sw_recvmsg().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1861d369efd62d67796563bf3e01fc22e5626f8b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7c8cf21bc4efb4af18d6096db3f8bd06d622251c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8a52139560f833c3975032e1f5762611e3a36d71
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c9ea01768903ae47f210cd457af1dead6de7a9c3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ddf8029623a1af20e984c040e89ff918158397ab
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/skmsg.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c9ea01768903ae47f210cd457af1dead6de7a9c3",
              "status": "affected",
              "version": "ef5659280eb13e8ac31c296f58cfdfa1684ac06b",
              "versionType": "git"
            },
            {
              "lessThan": "7c8cf21bc4efb4af18d6096db3f8bd06d622251c",
              "status": "affected",
              "version": "ef5659280eb13e8ac31c296f58cfdfa1684ac06b",
              "versionType": "git"
            },
            {
              "lessThan": "1861d369efd62d67796563bf3e01fc22e5626f8b",
              "status": "affected",
              "version": "ef5659280eb13e8ac31c296f58cfdfa1684ac06b",
              "versionType": "git"
            },
            {
              "lessThan": "8a52139560f833c3975032e1f5762611e3a36d71",
              "status": "affected",
              "version": "ef5659280eb13e8ac31c296f58cfdfa1684ac06b",
              "versionType": "git"
            },
            {
              "lessThan": "ddf8029623a1af20e984c040e89ff918158397ab",
              "status": "affected",
              "version": "ef5659280eb13e8ac31c296f58cfdfa1684ac06b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/core/skmsg.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.10"
            },
            {
              "lessThan": "5.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.142",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.92",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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-\u003esaved_data_ready when a TLS RX context is present,\navoiding a conflict with the TLS strparser\u0027s 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-\u003esaved_data_ready.  On data arrival:\n\n  tls_data_ready -\u003e tls_strp_data_ready -\u003e tls_rx_msg_ready\n    -\u003e saved_data_ready() = sk_psock_verdict_data_ready()\n      -\u003e 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() \u003e= full_len (stale), calls\ntcp_recv_skb() on the now-empty queue, hits WARN_ON_ONCE(!first), and\nreturns with rx_ctx-\u003estrp.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-\u003esaved_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()."
    }
  ],
  "id": "CVE-2026-64025",
  "lastModified": "2026-07-20T15:17:03.353",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-07-19T16:17:42.527",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1861d369efd62d67796563bf3e01fc22e5626f8b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7c8cf21bc4efb4af18d6096db3f8bd06d622251c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8a52139560f833c3975032e1f5762611e3a36d71"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c9ea01768903ae47f210cd457af1dead6de7a9c3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ddf8029623a1af20e984c040e89ff918158397ab"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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