{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full  The depth check in xfrm6_input_addr() is off by one:    if (1 + sp-\u003elen == XFRM_MAX_DEPTH)           goto drop;   ...   sp-\u003exvec[sp-\u003elen++] = x;  xfrm_input() can leave sp-\u003elen == XFRM_MAX_DEPTH, and the transport-mode receive path re-enters IPv6 input via xfrm_trans_reinject() with that secpath preserved. If the inner packet carries a destination-options HAO option or a type-2 routing header, xfrm6_input_addr() is called with sp-\u003elen == XFRM_MAX_DEPTH; the check (1 + 6 == 6) is false, so sp-\u003exvec[sp-\u003elen++] writes one slot past the 6-element xvec[]. The write stays within the sec_path allocation (invisible to KASAN); UBSAN_BOUNDS flags it and panics under panic_on_warn.  Use \"sp-\u003elen \u003e= XFRM_MAX_DEPTH\", matching xfrm_input(). This also restores one chain level the old check rejected at sp-\u003elen == 5.    UBSAN: array-index-out-of-bounds in net/ipv6/xfrm6_input.c:309:10   index 6 is out of range for type 'xfrm_state *[6]'",
  "id": "DEBIAN-CVE-2026-89783",
  "modified": "2026-09-17T04:47:37.156935667Z",
  "published": "2026-09-16T09:17:08.930Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-89783"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-89783"
  ]
}