{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "9473e1f631de339c50bde1e3bd09e1045fe90fd5"
            },
            {
              "fixed": "91fc387f63c00ddfb5221127a17bac97549a8343"
            },
            {
              "fixed": "68e8737fe8e72f085c608cff322b3d2de8340af1"
            },
            {
              "fixed": "8fe2c53fb81f5ad5be43af2ad09583f7c78b4b77"
            },
            {
              "fixed": "bdcda866c89f9a8b1acdabf02d26cde9fbe501d8"
            },
            {
              "fixed": "48996649222e95008cdb98cd58579e3fc8e5ee06"
            },
            {
              "fixed": "0f679e0523ddfff3fb554336ceb874b0e51e9cd3"
            },
            {
              "fixed": "5f35a29a5eed3d80befd32050843ac88dea3d61a"
            },
            {
              "fixed": "5d9e3bf34fec9a5d237e4b7cef4a707bc2e091bc"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.25"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89783.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full\n\nThe depth check in xfrm6_input_addr() is off by one:\n\n  if (1 + sp-\u003elen == XFRM_MAX_DEPTH)\n          goto drop;\n  ...\n  sp-\u003exvec[sp-\u003elen++] = x;\n\nxfrm_input() can leave sp-\u003elen == XFRM_MAX_DEPTH, and the transport-mode\nreceive path re-enters IPv6 input via xfrm_trans_reinject() with that\nsecpath preserved. If the inner packet carries a destination-options HAO\noption or a type-2 routing header, xfrm6_input_addr() is called with\nsp-\u003elen == XFRM_MAX_DEPTH; the check (1 + 6 == 6) is false, so\nsp-\u003exvec[sp-\u003elen++] writes one slot past the 6-element xvec[]. The write\nstays within the sec_path allocation (invisible to KASAN); UBSAN_BOUNDS\nflags it and panics under panic_on_warn.\n\nUse \"sp-\u003elen \u003e= XFRM_MAX_DEPTH\", matching xfrm_input(). This also\nrestores one chain level the old check rejected at sp-\u003elen == 5.\n\n  UBSAN: array-index-out-of-bounds in net/ipv6/xfrm6_input.c:309:10\n  index 6 is out of range for type 'xfrm_state *[6]'",
  "id": "CVE-2026-89783",
  "modified": "2026-09-18T03:30:16.929992808Z",
  "published": "2026-09-16T08:48:21.761Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f679e0523ddfff3fb554336ceb874b0e51e9cd3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/48996649222e95008cdb98cd58579e3fc8e5ee06"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d9e3bf34fec9a5d237e4b7cef4a707bc2e091bc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5f35a29a5eed3d80befd32050843ac88dea3d61a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/68e8737fe8e72f085c608cff322b3d2de8340af1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8fe2c53fb81f5ad5be43af2ad09583f7c78b4b77"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/91fc387f63c00ddfb5221127a17bac97549a8343"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bdcda866c89f9a8b1acdabf02d26cde9fbe501d8"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89783.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89783"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full"
}