{
  "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"
            },
            {
              "fixed": "7.2.8-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  exec: Cleanup POSIX timers right after de_thread()  A per-thread CPU timer holds a reference to the PID of the thread it is attached to and, while it is armed, its node is queued in that thread's posix_cputimers. The task is looked up by that PID.  When a non-leader thread exec()s, de_thread() changes which task owns that PID. pid_task(timer-\u003eit.cpu.pid, PIDTYPE_PID) then returns NULL, but the node is still queued on tsk, which is alive. timer_lock_sighand() takes a failed lookup to mean that the node is already dequeued, so it has nothing to undo.  begin_new_exec() calls posix_cpu_timers_exit(me) right after exec_task_namespaces() and that removes the leftover node, so the state normally stays invisible. But bprm-\u003epoint_of_no_return is set before de_thread(), so if unshare_files(), set_mm_exe_file(), exec_mmap() or exec_task_namespaces() fails, the task dies before it gets there. exit_itimers() then frees the k_itimer while its node is still queued, and reaping tsk later erases that freed node from the rbtree.  In short:        the non-leader thread B           the parent    timer_create(CLOCK_THREAD_CPUTIME_ID)   timer_settime()     arm_timer()            // the node is queued on B   execve()     de_thread(B)       exchange_tids(B, leader)  // B's PID now belongs to the leader       release_task(leader)         __exit_signal(leader)           posix_cpu_timers_exit(leader)  // cleans leader's queue, not B's           __unhash_process(leader)  // that PID has no task anymore     exec_mmap()       mmap_read_lock_killable(old_mm)                                 kill(B, SIGKILL)       // -EINTR   get_signal()     do_exit()       exit_itimers()         posix_timer_delete()           posix_cpu_timer_del()         posix_timer_unhash_and_free()  // freed while still queued                                 wait4()                                   release_task(B)                                     posix_cpu_timers_exit(B)                                       cleanup_timerqueue()                                         timerqueue_del()  // use-after-free  Move the POSIX timer cleanup right after de_thread() before any of the later failure conditions brings the task into do_exit().  [ tglx: Move the cleanup right after de_thread() ]",
  "id": "DEBIAN-CVE-2026-98260",
  "modified": "2026-10-08T09:47:27.100137121Z",
  "published": "2026-10-06T09:18:15.040Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-98260"
    }
  ],
  "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-2026-98260"
  ]
}