{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.180-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.100-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.5-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux-6.12"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.100-1~deb12u1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  net/smc: fix UAF in smc_cdc_rx_handler() by pinning the socket  smc_cdc_rx_handler() looks up the connection by token under the link group's conns_lock, drops the lock, and then dereferences conn and the smc_sock derived from it, ending in sock_hold(\u0026smc-\u003esk) inside smc_cdc_msg_recv(). No reference is held across the lock release.  The only reference pinning the socket while the connection is discoverable in the link group is taken in smc_lgr_register_conn() (sock_hold) and dropped in __smc_lgr_unregister_conn() (sock_put), both under conns_lock. Once the handler drops conns_lock, a concurrent close() -\u003e smc_release() -\u003e smc_conn_free() -\u003e smc_lgr_unregister_conn() can drop that reference and free the smc_sock, so the handler's later sock_hold() runs on freed memory:    WARNING: lib/refcount.c:25 at refcount_warn_saturate   Workqueue: rxe_wq do_work    refcount_warn_saturate (lib/refcount.c:25)    smc_cdc_msg_recv (net/smc/smc_cdc.c:430)    smc_cdc_rx_handler (net/smc/smc_cdc.c:502)    smc_wr_rx_tasklet_fn (net/smc/smc_wr.c:445)    tasklet_action_common (kernel/softirq.c:938)    handle_softirqs (kernel/softirq.c:622)   Kernel panic - not syncing: panic_on_warn set  Only SMC-R is affected. The SMC-D receive tasklet is stopped by tasklet_kill(\u0026conn-\u003erx_tsklet) in smc_conn_free() before the connection is unregistered, so it cannot run concurrently with the free.  Take the socket reference while still holding conns_lock, so the registration reference can no longer be the last one, and drop it once the handler is done.",
  "id": "DEBIAN-CVE-2026-64541",
  "modified": "2026-09-14T16:47:36.621491710Z",
  "published": "2026-07-27T21:17:06.570Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-64541"
    }
  ],
  "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-2026-64541"
  ]
}