{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.187-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.101-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.6-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux-6.12"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.101-1~deb12u1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  xfrm: policy: preallocate inexact bins before xfrm_hash_rebuild reinsert  xfrm_hash_rebuild()'s first loop preallocates the bins/chains the reinsert loop needs, so the reinsert (after hlist_del_rcu()) cannot allocate or fail. But its guard is inverted: it skips policies with prefixlen \u003c threshold and preallocates for the rest.  prefixlen \u003c threshold is exactly when policy_hash_bysel() returns NULL and the reinsert takes the allocating xfrm_policy_inexact_insert() path. So the loop preallocates for the exact policies (which never allocate) and skips the inexact ones, whose bin/node is then allocated GFP_ATOMIC during reinsert. On failure the error path only WARN_ONCE()s and continues, leaving a poisoned bydst node; the next rebuild's hlist_del_rcu() dereferences LIST_POISON2 and takes a GPF. Reachable under memory pressure, deterministic via failslab.  Invert the guard so preallocation covers exactly the reinserted policies; the reinsert then allocates nothing and cannot fail.  Crash:   Oops: general protection fault, probably for non-canonical address   0xfbd59c0000000024: 0000 [#1] SMP KASAN NOPTI   KASAN: maybe wild-memory-access in range [0xdead...]   ...   Workqueue: events xfrm_hash_rebuild   RIP: 0010:xfrm_hash_rebuild+0x5b3/0x1190   RAX: dead000000000122   (LIST_POISON2 + offset)   ...   Call Trace:    hlist_del_rcu (include/linux/rculist.h:599)    xfrm_hash_rebuild (net/xfrm/xfrm_policy.c:1365)    process_one_work (kernel/workqueue.c:3322)    worker_thread (kernel/workqueue.c:3486)    kthread (kernel/kthread.c:436)    ret_from_fork (arch/x86/kernel/process.c:158)    ret_from_fork_asm (arch/x86/entry/entry_64.S:245)    ...   Kernel panic - not syncing: Fatal exception in interrupt",
  "id": "DEBIAN-CVE-2026-64579",
  "modified": "2026-09-14T16:47:27.704878327Z",
  "published": "2026-08-05T08:16:37.893Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-64579"
    }
  ],
  "upstream": [
    "CVE-2026-64579"
  ]
}