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
References
Impacted products
Vendor Product Version
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)
Create a notification for this product.
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)
Create a notification for this product.
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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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            "lang": "en",
            "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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          }
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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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      "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/2026/cve-2026-98314.json",
      "version": "2"
    }
  }
}



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Taxonomy of the tags.





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.



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.