{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  tcp: fix use-after-free in do_tcp_getsockopt(TCP_CONGESTION)  do_tcp_getsockopt() reads icsk-\u003eicsk_ca_ops-\u003ename without holding rcu_read_lock(). Since commit 0baf26b0fcd7 (\"bpf: tcp: Support tcp_congestion_ops in bpf\"), icsk_ca_ops can point to dynamically allocated BPF struct_ops memory that may be freed concurrently via setsockopt(TCP_CONGESTION), leading to a use-after-free.    BUG: KASAN: slab-use-after-free in _copy_to_user+0x37/0x60   Read of size 16 at addr ffff888013505260 by task exploit/149    _copy_to_user+0x37/0x60    do_tcp_getsockopt+0x158a/0x2460 (net/ipv4/tcp.c:4585)    tcp_getsockopt+0x91/0xf0    __sys_getsockopt+0xf7/0x170  Fix this by holding rcu_read_lock() around the ca_ops-\u003ename access, using READ_ONCE() to load icsk_ca_ops, and copying the name to a stack buffer before releasing the lock. Also annotate the relevant icsk_ca_ops stores with WRITE_ONCE() to fix the accompanying KCSAN data-race issue.",
  "id": "DEBIAN-CVE-2026-99139",
  "modified": "2026-10-29T05:47:28.956407301Z",
  "published": "2026-10-28T11:17:33.850Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-99139"
    }
  ],
  "upstream": [
    "CVE-2026-99139"
  ]
}