CVE-2026-98314 (GCVE-0-2026-98314)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:46 – Updated: 2026-10-06 08:46
VLAI
Title
ALSA: pcm: set timer->private_data before registering the PCM timer
Summary
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: substream = timer->private_data; return substream->runtime ? ... // substream is NULL 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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6666 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 27f167e117eca310661fbcbacb352ea08face067 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 555d168bd98daa46daccc68c908201388c834293 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8c869d5cf5affb20994bdbb60e7d46d65c91b55f (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 686c7a6af1eea8d2a919303e4c6bbec3de79dbdc (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e1eee8f16628f8b6bcae0a366fd6a2dd65e71edd (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d63f5a9f8121fb43c798056d7dd34c58f47185d7 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0b349249d572633d7c8cdeb917623d1676a2b7c3 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1e713f9bb2ac583521f06b0eb4e22440b1e3d078 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.54 , ≤ 6.18.* (semver)
Unaffected: 7.2.8 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: pcm: set timer-\u003eprivate_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-\u003eprivate_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-\u003eprivate_data, which for this brief\nwindow is NULL, giving a NULL-pointer dereference:\n\n  substream = timer-\u003eprivate_data;\n  return substream-\u003eruntime ? ...   // 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-\u003etimer = NULL, which is already NULL at that point\nsince substream-\u003etimer is set to the new timer just once, after a\nsuccessful registration -- so the failure path stays safe."
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          "url": "https://git.kernel.org/stable/c/1e713f9bb2ac583521f06b0eb4e22440b1e3d078"
        }
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: pcm: set timer-\u003eprivate_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-\u003eprivate_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-\u003eprivate_data, which for this brief\nwindow is NULL, giving a NULL-pointer dereference:\n\n  substream = timer-\u003eprivate_data;\n  return substream-\u003eruntime ? ...   // 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-\u003etimer = NULL, which is already NULL at that point\nsince substream-\u003etimer is set to the new timer just once, after a\nsuccessful registration -- so the failure path stays safe."
          }
        ],
        "id": "CVE-2026-98314",
        "lastModified": "2026-10-06T09:18:23.033",
        "metrics": {},
        "published": "2026-10-06T09:18:23.033",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
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      "current_release_date": "2026-10-09T17:54:36+00:00",
      "cve": "CVE-2026-98314",
      "id": "CVE-2026-98314",
      "initial_release_date": "2026-10-06T00:00:00+00:00",
      "product_status:known_affected": "263",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ALSA: pcm: set timer-\u003eprivate_data before registering the PCM timer",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98314.json",
      "version": "3"
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      "cve": "CVE-2026-98314",
      "id": "CVE-2026-98314",
      "initial_release_date": "2026-10-07T00:00:44Z",
      "product_status:known_affected": "269",
      "product_status:known_not_affected": "78",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98314",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-98314.json",
      "version": "2"
    }
  }
}



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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

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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.
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  • 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.
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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.