{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72390",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72390"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "net/sched: sch_teql: Introduce slaves_lock to avoid race condition and UAF",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_teql: Introduce slaves_lock to avoid race condition and UAF\n\nThe teql master->slaves singly linked list is not protected against\nmultiple writes. It can be mod'ed concurently from teql_master_xmit(),\nteql_dequeue(), teql_init() and teql_destroy() without holding any list\nlock or RCU protection.\n\nzdi-disclosures@trendmicro.com has demonstrated that the qdisc is freed\nafter an RCU grace period, but teql_master_xmit() running on another\nCPU can still hold a stale pointer into the list, resulting in a\nslab-use-after-free:\n\nBUG: KASAN: slab-use-after-free in teql_master_xmit+0xf0f/0x16b0\nRead of size 8 at addr ffff888013fb0440 by task poc/332\nFreed 512-byte region [ffff888013fb0400, ffff888013fb0600) (kmalloc-512)\n\nThe fix?\nAdd a per-master slaves_lock spinlock that serializes all mutations of\nmaster->slaves and the NEXT_SLAVE() links in teql_destroy() and\nteql_qdisc_init(). teql_master_xmit() also takes the same slaves_lock\naround those updates.\nAnnotate master->slaves and the per-slave ->next pointer with __rcu and\nuse the appropriate RCU accessors everywhere they are touched:\nrcu_assign_pointer() on the writer side (under slaves_lock),\nrcu_dereference_protected() for the writer-side loads (also under\nslaves_lock), rcu_dereference_bh() for the loads in teql_master_xmit() and\nrtnl_dereference() for the loads in teql_master_open()/teql_master_mtu(),\nwhich run under RTNL.\nPair this with rcu_read_lock_bh()/rcu_read_unlock_bh() around the list\ntraversal in teql_master_xmit(), so that readers either observe a fully\nlinked list or are deferred until the in-flight mutation completes. The two\nearly-return paths in teql_master_xmit() are updated to release the RCU-bh\nread-side critical section before returning, since leaving it held would\ndisable BH on that CPU for good.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72390"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/03c67781254c574ae7fa75e881239a78473bdf42"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/735567bde7401f82b064f9f107b52ee1bf84ed8c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/11402e6e18e96df615cbcc58157818dd604b23ff"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9b7d05cbaa60108642402100efa6aa288dd33023"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b26aa9d993537a4c3167d8ceead3b7c69c3a0aac"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e5b811fe793166aecc59b085c1b7c31262ef2316"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires local rtnetlink tc/qdisc operations (RTM_NEWQDISC/RTM_DELQDISC) to attach or tear down TEQL slaves and local packet injection through teql0 to drive teql_master_xmit/teql_dequeue; remote peers cannot reach these control paths without prior CAP_NET_ADMIN setup.\nAC:L - The attacker controls both sides of the race by concurrently churning TEQL slave qdiscs via netlink teardown/re-add while flooding teql0 to keep teql_master_xmit traversing master->slaves; Trend Micro demonstrated reliable slab-use-after-free under this attacker-driven timing.\nPR:L - Configuring and deleting qdiscs requires CAP_NET_ADMIN, but rtnetlink checks netlink_net_capable() against the network namespace user_ns, so an unprivileged local user can obtain CAP_NET_ADMIN via user/network namespaces (unshare -Urn) without init-namespace root.\nUI:N - No victim interaction is required; the attacker programmatically loads/configures TEQL, starts transmit workers, and races qdisc deletion in parallel to trigger the use-after-free.\nS:U - Impact is kernel memory corruption and potential privilege escalation within the same kernel security domain; it does not inherently cross VM, container host, or IOMMU boundaries without separate further exploitation.\nC:H - Demonstrated slab-use-after-free reads through a stale Qdisc pointer in teql_master_xmit (8-byte read from a freed kmalloc-512 object); UAF on Qdisc structures enables heap spraying and arbitrary kernel memory disclosure.\nI:H - Use-after-free of the Qdisc object allows reallocating attacker-controlled data into the freed slab, corrupting list traversal and adjacent qdisc fields to obtain arbitrary kernel write primitives and potential code execution.\nA:H - The bug causes kernel oops/panic from dereferencing freed Qdisc memory during teql_master_xmit list walks; KASAN confirmed slab-use-after-free, and repeated triggering can deny service on affected systems."
    }
  }
}