CVE-2026-98314
Estado: RecibidaSin puntuar—
In the Linux kernel, the following vulnerability has been resolved:
ALSA: pcm: set timer->private_data before registering the PCM timer
snd_pcm_timer_init() calls snd_device_register() to link the new struct snd_timer into the global timer list while it still carries hw.c_resolution = snd_pcm_timer_resolution (and hw.start/hw.stop), and only afterwards sets timer->private_data = substream.
Once the timer is on the list under register_mutex, a concurrent reader can already reach it through the same mutex and invoke these callbacks. /proc/asound/timers does this via c_resolution(), and snd_timer_open()+snd_timer_start() reach start()/stop() the same way. All three dereference timer->private_data, which for this brief window is NULL, giving a NULL-pointer dereference:
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Move the private_data/private_free assignment before snd_device_register() so the timer is never visible on the list without its private_data set. On the snd_device_register() failure path, private_free() (snd_pcm_timer_free()) can now run, but it only does substream->timer = NULL, which is already NULL at that point since substream->timer is set to the new timer just once, after a successful registration -- so the failure path stays safe.
Detalles técnicos trazas, registros y código del informe original
substream = timer->private_data; return substream->runtime ? ... // substream is NULL
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.18%
- Percentil entre todas las CVEs puntuadas: 7
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/0b349249d572633d7c8cdeb917623d1676a2b7c3
- https://git.kernel.org/stable/c/1e713f9bb2ac583521f06b0eb4e22440b1e3d078
- https://git.kernel.org/stable/c/27f167e117eca310661fbcbacb352ea08face067
- https://git.kernel.org/stable/c/555d168bd98daa46daccc68c908201388c834293
- https://git.kernel.org/stable/c/686c7a6af1eea8d2a919303e4c6bbec3de79dbdc
- https://git.kernel.org/stable/c/8c869d5cf5affb20994bdbb60e7d46d65c91b55f
- https://git.kernel.org/stable/c/d63f5a9f8121fb43c798056d7dd34c58f47185d7
- https://git.kernel.org/stable/c/e1eee8f16628f8b6bcae0a366fd6a2dd65e71edd
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-98314",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
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{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
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{
"status": "unaffected",
"version": "6.1.189",
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{
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}
],
"published": "2026-10-06T09:18:23.033",
"references": [
{
"url": "https://git.kernel.org/stable/c/0b349249d572633d7c8cdeb917623d1676a2b7c3",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/8c869d5cf5affb20994bdbb60e7d46d65c91b55f",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/d63f5a9f8121fb43c798056d7dd34c58f47185d7",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e1eee8f16628f8b6bcae0a366fd6a2dd65e71edd",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: pcm: set timer->private_data before registering the PCM timer\n\nsnd_pcm_timer_init() calls snd_device_register() to link the new\nstruct snd_timer into the global timer list while it still carries\nhw.c_resolution = snd_pcm_timer_resolution (and hw.start/hw.stop),\nand only afterwards sets timer->private_data = substream.\n\nOnce the timer is on the list under register_mutex, a concurrent\nreader can already reach it through the same mutex and invoke these\ncallbacks. /proc/asound/timers does this via c_resolution(), and\nsnd_timer_open()+snd_timer_start() reach start()/stop() the same way.\nAll three dereference timer->private_data, which for this brief\nwindow is NULL, giving a NULL-pointer dereference:\n\n substream = timer->private_data;\n return substream->runtime ? ... // substream is NULL\n\nMove the private_data/private_free assignment before\nsnd_device_register() so the timer is never visible on the list\nwithout its private_data set. On the snd_device_register() failure\npath, private_free() (snd_pcm_timer_free()) can now run, but it only\ndoes substream->timer = NULL, which is already NULL at that point\nsince substream->timer is set to the new timer just once, after a\nsuccessful registration -- so the failure path stays safe."
}
],
"lastModified": "2026-10-06T09:18:23.033",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}