CVE-2025-39765
Full vulnerability record from the local CVENow database.
Description
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.
View original CVE JSON
{
"id": "CVE-2025-39765",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-09-11T17:15:40.807",
"lastModified": "2026-10-19T21:10:00.160",
"vulnStatus": "Analyzed",
"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 <TASK>\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->id 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 está asignado\n\nEn la función snd_utimer_create(), si la función kasprintf() devuelve NULL, se llamará a snd_utimer_put_id(), finalmente se usará ida_free() para liberar el id 0 no asignado.\n\nsyzkaller informó la siguiente información:\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 <TASK>\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->id debería establecerse correctamente antes de la función kasprintf(), asegura que la función snd_utimer_put_id() liberará el id asignado."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"sound/core/timer.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "37745918e0e7575bc40f38da93a99b9fa6406224",
"lessThan": "34327b362ce2849a5eb02f47e800049e7a20a0ba",
"versionType": "git",
"status": "affected"
},
{
"version": "37745918e0e7575bc40f38da93a99b9fa6406224",
"lessThan": "af386b52531d14c4b20f11c452787b1b6dd4eb8d",
"versionType": "git",
"status": "affected"
},
{
"version": "37745918e0e7575bc40f38da93a99b9fa6406224",
"lessThan": "5003a65790ed66be882d1987cc2ca86af0de3db1",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"sound/core/timer.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.12",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.12",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.44",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.16.4",
"lessThanOrEqual": "6.16.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.17",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Primary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "CWE-476"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.12",
"versionEndExcluding": "6.12.44",
"matchCriteriaId": "14C4B269-8787-47B5-A04C-8BFCE8F9C2D8"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.13",
"versionEndExcluding": "6.16.4",
"matchCriteriaId": "AFC28995-B8C3-4B68-8CB6-78E792B6629D"
},
{
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"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*",
"matchCriteriaId": "327D22EF-390B-454C-BD31-2ED23C998A1C"
},
{
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"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*",
"matchCriteriaId": "C730CD9A-D969-4A8E-9522-162AAF7C0EE9"
}
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]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/34327b362ce2849a5eb02f47e800049e7a20a0ba",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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{
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}