CVE-2025-39765 (GCVE-0-2025-39765)
Vulnerability from cvelistv5
Published
2025-09-11 16:56
Modified
2025-09-11 16:56
Severity ?
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/34327b362ce2849a5eb02f47e800049e7a20a0ba
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5003a65790ed66be882d1987cc2ca86af0de3db1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/af386b52531d14c4b20f11c452787b1b6dd4eb8d
Impacted products
Vendor Product Version
Linux Linux Version: 37745918e0e7575bc40f38da93a99b9fa6406224
Version: 37745918e0e7575bc40f38da93a99b9fa6406224
Version: 37745918e0e7575bc40f38da93a99b9fa6406224
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   Linux Linux Version: 6.12
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/core/timer.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "34327b362ce2849a5eb02f47e800049e7a20a0ba",
              "status": "affected",
              "version": "37745918e0e7575bc40f38da93a99b9fa6406224",
              "versionType": "git"
            },
            {
              "lessThan": "af386b52531d14c4b20f11c452787b1b6dd4eb8d",
              "status": "affected",
              "version": "37745918e0e7575bc40f38da93a99b9fa6406224",
              "versionType": "git"
            },
            {
              "lessThan": "5003a65790ed66be882d1987cc2ca86af0de3db1",
              "status": "affected",
              "version": "37745918e0e7575bc40f38da93a99b9fa6406224",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "sound/core/timer.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.44",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.4",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17-rc3",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-11T16:56:20.738Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/34327b362ce2849a5eb02f47e800049e7a20a0ba"
        },
        {
          "url": "https://git.kernel.org/stable/c/af386b52531d14c4b20f11c452787b1b6dd4eb8d"
        },
        {
          "url": "https://git.kernel.org/stable/c/5003a65790ed66be882d1987cc2ca86af0de3db1"
        }
      ],
      "title": "ALSA: timer: fix ida_free call while not allocated",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39765",
    "datePublished": "2025-09-11T16:56:20.738Z",
    "dateReserved": "2025-04-16T07:20:57.126Z",
    "dateUpdated": "2025-09-11T16:56:20.738Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39765\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-11T17:15:40.807\",\"lastModified\":\"2025-09-15T15:22:38.297\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/34327b362ce2849a5eb02f47e800049e7a20a0ba\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5003a65790ed66be882d1987cc2ca86af0de3db1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/af386b52531d14c4b20f11c452787b1b6dd4eb8d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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