{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "0190c1d452a91c38a3462abdd81752be1b9006a8"
            },
            {
              "fixed": "39b751a210bf61a374afa82749afc7a77a08bf1d"
            },
            {
              "fixed": "dd80a7519824b72c8fcfd3cc50cb93f7e2d90923"
            },
            {
              "fixed": "6bf076258aac4e0af69ef317656c31ce6444d647"
            },
            {
              "fixed": "6c9f07bf8800171de2cd3f02815cebe1f4d45f2d"
            },
            {
              "fixed": "259caa711b7688365676442e2fdb286b8aceaa80"
            },
            {
              "fixed": "968550a439f64bd1a6c0d88efb92e4f082f84a26"
            },
            {
              "fixed": "a9551f26287debe6d8aa6e8841974661065b975f"
            },
            {
              "fixed": "c82b797abe668d0b668601a93ba2c0b071a63574"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.19.0"
            },
            {
              "fixed": "5.10.271"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.222"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.189"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.158"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.112"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.55"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98380.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: reject IDR error pointers when deleting actions\n\ntcf_action_delete() drops the reference held by its lookup before calling\ntcf_idr_delete_index() with the saved action index.  An unlocked\nclassifier can remove that action and reserve the same IDR slot with\nERR_PTR(-EBUSY) in between.\n\ntcf_idr_delete_index() only checks the lookup result for NULL.  It\ntherefore treats the reservation as a tc_action and dereferences\ntcfa_bindcnt.  A hardware execution breakpoint was used to schedule the\ninterleaving without changing the kernel source.  KASAN reported this\ndecoded trace:\n\n  BUG: KASAN: null-ptr-deref in tca_action_gd+0x5b9/0x1010\n  Read of size 4 at addr 0000000000000010 by task poc/150\n  Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002\n  RIP: tca_action_gd+0x5c0/0x1010:\n    arch_atomic_read at arch/x86/include/asm/atomic.h:23\n    raw_atomic_read at include/linux/atomic/atomic-arch-fallback.h:457\n    atomic_read at include/linux/atomic/atomic-instrumented.h:33\n    tcf_idr_delete_index at net/sched/act_api.c:766\n    tcf_action_delete at net/sched/act_api.c:1859\n    tcf_del_notify at net/sched/act_api.c:2014\n    tca_action_gd at net/sched/act_api.c:2064\n  R13: 0000000000000010 R15: fffffffffffffff0\n  Kernel panic - not syncing: Fatal exception\n\nR15 contains ERR_PTR(-EBUSY), and adding the tcfa_bindcnt offset produces\nthe address in R13.  With the guard applied, the same reproducer returned\n-ENOENT without a KASAN report or panic.  Treat error pointers as absent\nand return -ENOENT.",
  "id": "CVE-2026-98380",
  "modified": "2026-10-11T02:30:21.237474624Z",
  "published": "2026-10-09T07:34:20.218Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/259caa711b7688365676442e2fdb286b8aceaa80"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/39b751a210bf61a374afa82749afc7a77a08bf1d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6bf076258aac4e0af69ef317656c31ce6444d647"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6c9f07bf8800171de2cd3f02815cebe1f4d45f2d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/968550a439f64bd1a6c0d88efb92e4f082f84a26"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a9551f26287debe6d8aa6e8841974661065b975f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c82b797abe668d0b668601a93ba2c0b071a63574"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dd80a7519824b72c8fcfd3cc50cb93f7e2d90923"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98380.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98380"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "net/sched: reject IDR error pointers when deleting actions"
}