{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"
            },
            {
              "fixed": "03c67781254c574ae7fa75e881239a78473bdf42"
            },
            {
              "fixed": "735567bde7401f82b064f9f107b52ee1bf84ed8c"
            },
            {
              "fixed": "11402e6e18e96df615cbcc58157818dd604b23ff"
            },
            {
              "fixed": "9b7d05cbaa60108642402100efa6aa288dd33023"
            },
            {
              "fixed": "b26aa9d993537a4c3167d8ceead3b7c69c3a0aac"
            },
            {
              "fixed": "e5b811fe793166aecc59b085c1b7c31262ef2316"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.12"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72390.json"
  },
  "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-\u003eslaves 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-\u003eslaves 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-\u003eslaves and the per-slave -\u003enext 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.",
  "id": "CVE-2026-72390",
  "modified": "2026-08-16T03:31:29.130507044Z",
  "published": "2026-08-15T05:56:19.186Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/03c67781254c574ae7fa75e881239a78473bdf42"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/11402e6e18e96df615cbcc58157818dd604b23ff"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/735567bde7401f82b064f9f107b52ee1bf84ed8c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b7d05cbaa60108642402100efa6aa288dd33023"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b26aa9d993537a4c3167d8ceead3b7c69c3a0aac"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e5b811fe793166aecc59b085c1b7c31262ef2316"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72390.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72390"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "net/sched: sch_teql: Introduce slaves_lock to avoid race condition and UAF"
}