CVE-2025-40163

{
  "id": "CVE-2025-40163",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-11-12T11:15:46.517",
  "lastModified": "2026-10-19T21:10:00.160",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/deadline: Stop dl_server before CPU goes offline\n\nIBM CI tool reported kernel warning[1] when running a CPU removal\noperation through drmgr[2]. i.e \"drmgr -c cpu -r -q 1\"\n\nWARNING: CPU: 0 PID: 0 at kernel/sched/cpudeadline.c:219 cpudl_set+0x58/0x170\nNIP [c0000000002b6ed8] cpudl_set+0x58/0x170\nLR [c0000000002b7cb8] dl_server_timer+0x168/0x2a0\nCall Trace:\n[c000000002c2f8c0] init_stack+0x78c0/0x8000 (unreliable)\n[c0000000002b7cb8] dl_server_timer+0x168/0x2a0\n[c00000000034df84] __hrtimer_run_queues+0x1a4/0x390\n[c00000000034f624] hrtimer_interrupt+0x124/0x300\n[c00000000002a230] timer_interrupt+0x140/0x320\n\nGit bisects to: commit 4ae8d9aa9f9d (\"sched/deadline: Fix dl_server getting stuck\")\n\nThis happens since:\n- dl_server hrtimer gets enqueued close to cpu offline, when\n  kthread_park enqueues a fair task.\n- CPU goes offline and drmgr removes it from cpu_present_mask.\n- hrtimer fires and warning is hit.\n\nFix it by stopping the dl_server before CPU is marked dead.\n\n[1]: https://lore.kernel.org/all/[email protected]/\n[2]: https://github.com/ibm-power-utilities/powerpc-utils/tree/next/src/drmgr\n\n[sshegde: wrote the changelog and tested it]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nsched/deadline: Detener dl_server antes de que la CPU se desconecte\n\nLa herramienta de CI de IBM informó una advertencia del kernel[1] al ejecutar una operación de eliminación de CPU a través de drmgr[2]. Es decir, “drmgr -c cpu -r -q 1”\n\nADVERTENCIA: CPU: 0 PID: 0 en kernel/sched/cpudeadline.c:219 cpudl_set+0x58/0x170\nNIP [c0000000002b6ed8] cpudl_set+0x58/0x170\nLR [c0000000002b7cb8] dl_server_timer+0x168/0x2a0\nRastreo de Llamadas:\n[c000000002c2f8c0] init_stack+0x78c0/0x8000 (no fiable)\n[c0000000002b7cb8] dl_server_timer+0x168/0x2a0\n[c00000000034df84] __hrtimer_run_queues+0x1a4/0x390\n[c00000000034f624] hrtimer_interrupt+0x124/0x300\n[c00000000002a230] timer_interrupt+0x140/0x320\n\nGit bisecta a: commit 4ae8d9aa9f9d (“sched/deadline: Solucionar el bloqueo de dl_server”)\n\nEsto ocurre porque:\n- el hrtimer de dl_server se encola cerca de la desconexión de la CPU, cuando kthread_park encola una tarea justa.\n- la CPU se desconecta y drmgr la elimina de cpu_present_mask.\n- el hrtimer se activa y se produce la advertencia.\n\nSe soluciona deteniendo el dl_server antes de que la CPU sea marcada como inactiva.\n\n[1]: https://lore.kernel.org/all/[email protected]/\n[2]: https://github.com/ibm-power-utilities/powerpc-utils/tree/next/src/drmgr\n\n[sshegde: escribió el registro de cambios y lo probó]"
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "kernel/sched/core.c",
            "kernel/sched/deadline.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "030167dcadf50a9f9dac4de6fa4c34f4f7afeed7",
              "lessThan": "d7fd56ed5e07e053a5eea6112d61fcaded653b87",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4ae8d9aa9f9dc7137ea5e564d79c5aa5af1bc45c",
              "lessThan": "ab6c0f158508bb16d483add70b73a73f95651c33",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4ae8d9aa9f9dc7137ea5e564d79c5aa5af1bc45c",
              "lessThan": "ee6e44dfe6e50b4a5df853d933a96bdff5309e6e",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "kernel/sched/core.c",
            "kernel/sched/deadline.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.17",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.17",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.17.5",
              "lessThanOrEqual": "6.17.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/ab6c0f158508bb16d483add70b73a73f95651c33",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d7fd56ed5e07e053a5eea6112d61fcaded653b87",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ee6e44dfe6e50b4a5df853d933a96bdff5309e6e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}