{
  "cveId": "CVE-2026-99138",
  "url": "https://patchblox.com/security/cve/CVE-2026-99138",
  "summary": "CVE-2026-99138 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-99138, released November 3, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "tcp: fix use-after-free in do_tcp_getsockopt(TCP_CC_INFO)",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  tcp: fix use-after-free in do_tcp_getsockopt(TCP_CC_INFO)  do_tcp_getsockopt() reads icsk-\u003Eicsk_ca_ops and dereferences the get_info function pointer without rcu_read_lock(). With BPF struct_ops congestion control, ca_ops can point to dynamically allocated memory that is freed concurrently, resulting in a use-after-free when the kernel dereferences or calls through the stale pointer.    BUG: KASAN: slab-use-after-free in do_tcp_getsockopt\u002B0x2037/0x23e0   Read of size 8 at addr ffff888013701258 by task exploit/149    do_tcp_getsockopt\u002B0x2037/0x23e0 (net/ipv4/tcp.c:4564)    tcp_getsockopt\u002B0x91/0xf0    __sys_getsockopt\u002B0xf7/0x170  Fix this by wrapping the ca_ops load and get_info call within rcu_read_lock()/rcu_read_unlock(), and using READ_ONCE() to load the icsk_ca_ops pointer.",
  "published": "2026-10-28T11:17:33Z",
  "severity": "Important",
  "cvss": 7.8,
  "epss": 0.00177,
  "epssPercentile": 0.07339,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99138",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-99138",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99138",
      "released": "2026-11-03T18:58:21Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.13-1",
      "fix": "DEBIAN-CVE-2026-99138",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99138",
      "released": "2026-11-03T18:58:21Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}