{
  "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": "6.12.105-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.10-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux-6.12"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.107-1~deb12u1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  netfilter: ipset: fix refcount race between list:set GC and swap  __ip_set_put_byindex() resolved the index to a set pointer under RCU, then took ip_set_ref_lock in __ip_set_put() to decrement set-\u003eref. ip_set_swap() holds that same lock while swapping both the ip_set_list slots and the two sets' ref counters, so it can interleave between the dereference and the lock acquisition, leaving the caller to decrement a set whose reference already moved to the other index and hit BUG_ON(set-\u003eref == 0). list_set_gc() reaches this from timer softirq, which the nfnl mutex does not serialize against swap: an expiring list:set member calls list_set_del() -\u003e ip_set_put_byindex() while IPSET_CMD_SWAP runs on the referenced sets.  Resolve the index and decrement under ip_set_ref_lock, as ip_set_swap() already does, keeping the refcount tied to the index rather than to a stale set pointer.    kernel BUG at net/netfilter/ipset/ip_set_core.c:685!   Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI   RIP: 0010:ip_set_put_byindex (net/netfilter/ipset/ip_set_core.c:870)   Call Trace:    \u003cIRQ\u003e    list_set_del (net/netfilter/ipset/ip_set_list_set.c:159)    set_cleanup_entries (net/netfilter/ipset/ip_set_list_set.c:181)    list_set_gc (net/netfilter/ipset/ip_set_list_set.c:578)    call_timer_fn (kernel/time/timer.c:1748)    __run_timers (kernel/time/timer.c:1799 kernel/time/timer.c:2374)    run_timer_softirq (kernel/time/timer.c:2405)    \u003c/IRQ\u003e   Kernel panic - not syncing: Fatal exception in interrupt",
  "id": "DEBIAN-CVE-2026-74748",
  "modified": "2026-09-19T21:47:32.476827240Z",
  "published": "2026-08-26T15:16:53.770Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-74748"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-74748"
  ]
}