{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.94-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.0.12-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  ipv6: ioam: refresh hdr pointer before ioam6_event()  Reported by Sashiko:  In ipv6_hop_ioam(), the hdr pointer is initialized to point into the skb's linear data buffer. Later, the code calls skb_ensure_writable(), which might reallocate the buffer:  \tif (skb_ensure_writable(skb, optoff + 2 + hdr-\u003eopt_len)) \t\tgoto drop;  \t/* Trace pointer may have changed */ \ttrace = (struct ioam6_trace_hdr *)(skb_network_header(skb) \t\t\t\t\t   + optoff + sizeof(*hdr));  \tioam6_fill_trace_data(skb, ns, trace, true);  \tioam6_event(IOAM6_EVENT_TRACE, dev_net(skb-\u003edev), \t\t    GFP_ATOMIC, (void *)trace, hdr-\u003eopt_len - 2);  If the skb is cloned or lacks sufficient linear headroom, skb_ensure_writable() will invoke pskb_expand_head(), which reallocates the skb's data buffer and frees the old one, invalidating pointers to it. While the code recalculates the trace pointer immediately after the call to skb_ensure_writable(), it fails to recalculate the hdr pointer.  This patch fixes the above by recalculating the hdr pointer before passing hdr-\u003eopt_len to ioam6_event(), so that we avoid any UaF.",
  "id": "DEBIAN-CVE-2026-64132",
  "modified": "2026-09-14T16:47:35.048245579Z",
  "published": "2026-07-19T16:17:55Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-64132"
    }
  ],
  "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-2026-64132"
  ]
}