{
  "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:  RDMA/ucma: Lock the handler in ucma_set_ib_path()  ucma_set_ib_path() calls ucma_event_handler() straight from the write() path, without the handler lock that keeps ctx-\u003efile stable while a uevent is queued.  The handler re-reads ctx-\u003efile for every dereference:  \tmutex_lock(\u0026ctx-\u003efile-\u003emut);\t\t\t/* file A */ \tlist_add_tail(\u0026uevent-\u003elist, \u0026ctx-\u003efile-\u003eevent_list);\t/* file B */ \tmutex_unlock(\u0026ctx-\u003efile-\u003emut);\t\t\t/* file B */ \twake_up_interruptible(\u0026ctx-\u003efile-\u003epoll_wait);\t/* file B */  A concurrent ucma_migrate_id() reassigns ctx-\u003efile while the SET_OPTION caller sleeps in mutex_lock(), so the list_add_tail() lands on file B's event_list while only file A's mutex is held, racing every other user of that list:    BUG: KASAN: slab-use-after-free in __list_add_valid_or_report+0x1aa/0x1c0   Read of size 8 at addr ffff888153c6a418 by task poc_corr/486   Call Trace:    __list_add_valid_or_report+0x1aa/0x1c0    ucma_event_handler+0x1be/0xc00    ucma_set_ib_path+0x45e/0x710    ucma_set_option+0x32e/0x590    ucma_write+0x1f9/0x330   Allocated by task 505:    ucma_write_cm_event+0x1a1/0x660   Freed by task 505:    kfree+0x1da/0x4c0    ucma_get_event+0x5d5/0x7e0  The freed object is a ucma_event that another thread dequeued from file B's list under file B's mutex.  File A's mut is left held on top of that, wedging its next writer in uninterruptible sleep.  This path needs a bound and address-resolved cm_id, so it requires an RDMA device to be present.  Take the handler lock around the call.",
  "id": "DEBIAN-CVE-2026-89508",
  "modified": "2026-09-15T08:47:42.785558943Z",
  "published": "2026-09-11T20:19:33.143Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-89508"
    }
  ],
  "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-2026-89508"
  ]
}