{
  "affected": [
    {
      "ranges": [
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          "events": [
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              "introduced": "9b2c3184e126b941dfa716b8128ed6db92a64e2f"
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              "fixed": "21fc07924e996e1e661268ca269c86b8d59d25b3"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "type": "GIT"
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              "introduced": "73af53d82076bbe184d9ece9e14b0dc8599e6055"
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            {
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              "fixed": "f6696481eedfd5752b4b56eed715d0b0fe48b9c5"
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            {
              "fixed": "2f898f9ec7c73c5697ee462681e7ea6984ee1f3d"
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          "type": "GIT"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
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      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
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              "introduced": "0"
            },
            {
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          ],
          "type": "ECOSYSTEM"
        },
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          ],
          "type": "ECOSYSTEM"
        },
        {
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              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.112"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
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              "introduced": "6.12.0"
            },
            {
              "fixed": "6.18.55"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
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              "introduced": "6.13.0"
            },
            {
              "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-2026-98629.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_u32: fix manual hash table handle IDR aliasing\n\nA u32 hash table created with an explicit handle ('tc filter add ...\nhandle 801: u32 divisor N') keys its IDR entry on the raw handle, while\nthe destroy paths free it under handle2id(handle). The two key domains\ndisagree for handles in the 0x800..0xFFF htid range:\nhandle2id() folds them back into the auto-allocated id space (1..0x7FF).\n\nA manual table therefore leaves its raw-keyed IDR entry unreachable on\ndelete (a permanent leak), and its delete can drop the idr entry of an\nunrelated live auto table. A later auto allocation can then hand out a\nhandle that aliases the live manual table; u32_lookup_ht() first-match\nroutes lookups and TCA_U32_LINK for that htid to the wrong table.\n\nKey the divisor-path alloc on handle2id(handle) so allocation and\nremoval share one key domain. A manual handle that maps onto an id\nalready in use is rejected with -ENOSPC, and auto allocation skips ids\nheld by live manual tables.\n\nConditions to recreate:\n  ip link add test0 type dummy\n  tc qdisc add dev test0 clsact\n  tc filter add dev test0 ingress protocol ip pref 1 \\\n          handle 801: u32 divisor 16\n  tc filter add dev test0 ingress protocol ip pref 2 u32 divisor 16\n  tc -d filter show dev test0 ingress | grep 'fh 801:'\n  # unpatched: two live tables with handle 0x80100000 (the pref 2 root\n  # hnode is auto-allocated id 1); patched: the auto hnode takes id 2.\n\nAlso tested with a poc with a live u32 table on the block, add/delete a manual\ntable 'handle 901: u32 divisor 1' twice; unpatched, the re-add fails with\n-ENOSPC because the raw key leaked on the first delete.",
  "id": "CVE-2026-98629",
  "modified": "2026-10-19T02:30:16.621480888Z",
  "published": "2026-10-18T15:19:50.589Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0a5f5d9e94dead312d32c366b917c64e552b72f7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0fac292d93fdb313099e98cce928b3a524c92c94"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/21fc07924e996e1e661268ca269c86b8d59d25b3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2f898f9ec7c73c5697ee462681e7ea6984ee1f3d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/54a454c5e41f5e2cb70c8163140ce095c5d5eefd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f6696481eedfd5752b4b56eed715d0b0fe48b9c5"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98629.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98629"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "net/sched: cls_u32: fix manual hash table handle IDR aliasing"
}