CVE-2025-39765 (GCVE-0-2025-39765)

Vulnerability from cvelistv5 – Published: 2025-09-11 16:56 – Updated: 2026-05-11 21:35
VLAI
Title
ALSA: timer: fix ida_free call while not allocated
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: timer: fix ida_free call while not allocated In the snd_utimer_create() function, if the kasprintf() function return NULL, snd_utimer_put_id() will be called, finally use ida_free() to free the unallocated id 0. the syzkaller reported the following information: ------------[ cut here ]------------ ida_free called for id=0 which is not allocated. WARNING: CPU: 1 PID: 1286 at lib/idr.c:592 ida_free+0x1fd/0x2f0 lib/idr.c:592 Modules linked in: CPU: 1 UID: 0 PID: 1286 Comm: syz-executor164 Not tainted 6.15.8 #3 PREEMPT(lazy) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-4.fc42 04/01/2014 RIP: 0010:ida_free+0x1fd/0x2f0 lib/idr.c:592 Code: f8 fc 41 83 fc 3e 76 69 e8 70 b2 f8 (...) RSP: 0018:ffffc900007f79c8 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 1ffff920000fef3b RCX: ffffffff872176a5 RDX: ffff88800369d200 RSI: 0000000000000000 RDI: ffff88800369d200 RBP: 0000000000000000 R08: ffffffff87ba60a5 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f6f1abc1740(0000) GS:ffff8880d76a0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6f1ad7a784 CR3: 000000007a6e2000 CR4: 00000000000006f0 Call Trace: <TASK> snd_utimer_put_id sound/core/timer.c:2043 [inline] [snd_timer] snd_utimer_create+0x59b/0x6a0 sound/core/timer.c:2184 [snd_timer] snd_utimer_ioctl_create sound/core/timer.c:2202 [inline] [snd_timer] __snd_timer_user_ioctl.isra.0+0x724/0x1340 sound/core/timer.c:2287 [snd_timer] snd_timer_user_ioctl+0x75/0xc0 sound/core/timer.c:2298 [snd_timer] vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __x64_sys_ioctl+0x198/0x200 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x7b/0x160 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x76/0x7e [...] The utimer->id should be set properly before the kasprintf() function, ensures the snd_utimer_put_id() function will free the allocated id.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6843 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 37745918e0e7575bc40f38da93a99b9fa6406224 , < 34327b362ce2849a5eb02f47e800049e7a20a0ba (git)
Affected: 37745918e0e7575bc40f38da93a99b9fa6406224 , < af386b52531d14c4b20f11c452787b1b6dd4eb8d (git)
Affected: 37745918e0e7575bc40f38da93a99b9fa6406224 , < 5003a65790ed66be882d1987cc2ca86af0de3db1 (git)
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Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.12.44 , ≤ 6.12.* (semver)
Unaffected: 6.16.4 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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        "descriptions": [
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: timer: fix ida_free call while not allocated\n\nIn the snd_utimer_create() function, if the kasprintf() function return\nNULL, snd_utimer_put_id() will be called, finally use ida_free()\nto free the unallocated id 0.\n\nthe syzkaller reported the following information:\n  ------------[ cut here ]------------\n  ida_free called for id=0 which is not allocated.\n  WARNING: CPU: 1 PID: 1286 at lib/idr.c:592 ida_free+0x1fd/0x2f0 lib/idr.c:592\n  Modules linked in:\n  CPU: 1 UID: 0 PID: 1286 Comm: syz-executor164 Not tainted 6.15.8 #3 PREEMPT(lazy)\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-4.fc42 04/01/2014\n  RIP: 0010:ida_free+0x1fd/0x2f0 lib/idr.c:592\n  Code: f8 fc 41 83 fc 3e 76 69 e8 70 b2 f8 (...)\n  RSP: 0018:ffffc900007f79c8 EFLAGS: 00010282\n  RAX: 0000000000000000 RBX: 1ffff920000fef3b RCX: ffffffff872176a5\n  RDX: ffff88800369d200 RSI: 0000000000000000 RDI: ffff88800369d200\n  RBP: 0000000000000000 R08: ffffffff87ba60a5 R09: 0000000000000000\n  R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000\n  R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000\n  FS:  00007f6f1abc1740(0000) GS:ffff8880d76a0000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 00007f6f1ad7a784 CR3: 000000007a6e2000 CR4: 00000000000006f0\n  Call Trace:\n   \u003cTASK\u003e\n   snd_utimer_put_id sound/core/timer.c:2043 [inline] [snd_timer]\n   snd_utimer_create+0x59b/0x6a0 sound/core/timer.c:2184 [snd_timer]\n   snd_utimer_ioctl_create sound/core/timer.c:2202 [inline] [snd_timer]\n   __snd_timer_user_ioctl.isra.0+0x724/0x1340 sound/core/timer.c:2287 [snd_timer]\n   snd_timer_user_ioctl+0x75/0xc0 sound/core/timer.c:2298 [snd_timer]\n   vfs_ioctl fs/ioctl.c:51 [inline]\n   __do_sys_ioctl fs/ioctl.c:907 [inline]\n   __se_sys_ioctl fs/ioctl.c:893 [inline]\n   __x64_sys_ioctl+0x198/0x200 fs/ioctl.c:893\n   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n   do_syscall_64+0x7b/0x160 arch/x86/entry/syscall_64.c:94\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e\n  [...]\n\nThe utimer-\u003eid should be set properly before the kasprintf() function,\nensures the snd_utimer_put_id() function will free the allocated id."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nALSA: timer: corregir la llamada a ida_free mientras no est\u00e1 asignado\n\nEn la funci\u00f3n snd_utimer_create(), si la funci\u00f3n kasprintf() devuelve NULL, se llamar\u00e1 a snd_utimer_put_id(), finalmente se usar\u00e1 ida_free() para liberar el id 0 no asignado.\n\nsyzkaller inform\u00f3 la siguiente informaci\u00f3n:\n  ------------[ cut here ]------------\n  ida_free called for id=0 which is not allocated.\n  WARNING: CPU: 1 PID: 1286 at lib/idr.c:592 ida_free+0x1fd/0x2f0 lib/idr.c:592\n  Modules linked in:\n  CPU: 1 UID: 0 PID: 1286 Comm: syz-executor164 Not tainted 6.15.8 #3 PREEMPT(lazy)\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-4.fc42 04/01/2014\n  RIP: 0010:ida_free+0x1fd/0x2f0 lib/idr.c:592\n  Code: f8 fc 41 83 fc 3e 76 69 e8 70 b2 f8 (...)\n  RSP: 0018:ffffc900007f79c8 EFLAGS: 00010282\n  RAX: 0000000000000000 RBX: 1ffff920000fef3b RCX: ffffffff872176a5\n  RDX: ffff88800369d200 RSI: 0000000000000000 RDI: ffff88800369d200\n  RBP: 0000000000000000 R08: ffffffff87ba60a5 R09: 0000000000000000\n  R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000\n  R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000\n  FS:  00007f6f1abc1740(0000) GS:ffff8880d76a0000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 00007f6f1ad7a784 CR3: 000000007a6e2000 CR4: 00000000000006f0\n  Call Trace:\n   \u003cTASK\u003e\n   snd_utimer_put_id sound/core/timer.c:2043 [inline] [snd_timer]\n   snd_utimer_create+0x59b/0x6a0 sound/core/timer.c:2184 [snd_timer]\n   snd_utimer_ioctl_create sound/core/timer.c:2202 [inline] [snd_timer]\n   __snd_timer_user_ioctl.isra.0+0x724/0x1340 sound/core/timer.c:2287 [snd_timer]\n   snd_timer_user_ioctl+0x75/0xc0 sound/core/timer.c:2298 [snd_timer]\n   vfs_ioctl fs/ioctl.c:51 [inline]\n   __do_sys_ioctl fs/ioctl.c:907 [inline]\n   __se_sys_ioctl fs/ioctl.c:893 [inline]\n   __x64_sys_ioctl+0x198/0x200 fs/ioctl.c:893\n   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n   do_syscall_64+0x7b/0x160 arch/x86/entry/syscall_64.c:94\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e\n  [...]\n\nEl utimer-\u003eid deber\u00eda establecerse correctamente antes de la funci\u00f3n kasprintf(), asegura que la funci\u00f3n snd_utimer_put_id() liberar\u00e1 el id asignado."
          }
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        "id": "CVE-2025-39765",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {
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              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
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        "published": "2025-09-11T17:15:40.807",
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        "vulnStatus": "Analyzed",
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    "redhat_vex": {
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      "current_release_date": "2026-06-30T01:19:55+00:00",
      "cve": "CVE-2025-39765",
      "id": "CVE-2025-39765",
      "initial_release_date": "2025-09-11T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ALSA: timer: fix ida_free call while not allocated",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39765.json",
      "version": "3"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.