VulnerabilityPublished 23 Oct 2026Updated 26 Oct 2026

CVE-2026-98912: Linux kernel · ALSA: seq: oss: Reject reads that cannot fit the next event

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in b3b4b647313757a275be7f7f9d0415d0a90acf73 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:18 UTC

Severity

Low

Rated Low by Threat Radar's AI analysis · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 8% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in b3b4b647313757a275be7f7f9d0415d0a90acf73, 591226398c1f93bd994678237ff0be229b19d3bb, 7483fd5f6990f43cc266e94b3f50ce84856ebb97 +4

Exploitation evidence

Disclosed: evidence found.
CVE published 23 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < b3b4b647313757a275be7f7f9d0415d0a90acf73	Fixed in b3b4b647313757a275be7f7f9d0415d0a90acf73
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 591226398c1f93bd994678237ff0be229b19d3bb	Fixed in 591226398c1f93bd994678237ff0be229b19d3bb
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 7483fd5f6990f43cc266e94b3f50ce84856ebb97	Fixed in 7483fd5f6990f43cc266e94b3f50ce84856ebb97
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 2922cf2583e590f51bed613a6fcd27b9aea83674	Fixed in 2922cf2583e590f51bed613a6fcd27b9aea83674
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 611f538253d970f4d152003841544e875828d015	Fixed in 611f538253d970f4d152003841544e875828d015
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 372bec8a01e2ab8eaa6851bdc346ede5f82dba99	Fixed in 372bec8a01e2ab8eaa6851bdc346ede5f82dba99

AI-suggested

The issue is fixed in the Linux kernel commits identified by the provided fixedVersions hashes. Users should update their Linux kernel to a version including these fixes. No additional mitigation is indicated.

Description

A vulnerability in the Linux kernel ALSA sequencer OSS interface causes incorrect handling of read buffer sizes. The snd_seq_oss_read() function incorrectly checks if the next event fits in the remaining userspace buffer, leading to potential improper event copying or misinterpretation of end-of-file conditions. This flaw has been fixed in later kernel commits.

Impact

This vulnerability could cause incorrect behavior in applications reading OSS sequencer events, such as missing events or reading partial events incorrectly. It may lead to data inconsistency or application errors when processing ALSA sequencer events. There is no indication of privilege escalation or remote code execution impact.

Summary

The Linux kernel ALSA sequencer OSS interface had a logic error in snd_seq_oss_read() where the check for whether the next queued OSS sequencer event fits in the remaining userspace buffer was inverted. This caused normal 4-byte events to be skipped when the read buffer was 8 bytes, and conversely allowed 8-byte events to be copied into smaller buffers. The fix changes the condition to break only when the remaining buffer is smaller than the next event and returns -EINVAL if no complete event was copied, preventing undersized reads from appearing as end-of-file while leaving events queued for later reads.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 09:34 UTC

Technical details

References

Community reviews

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