CVE-2026-98912

ALSA: seq: oss: Reject reads that cannot fit the next event

Published Oct 23, 2026 CVSS 3.1 · 4.4 Medium EPSS < 1% KEV · Not listed

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.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`1da177e4c3f41524e886b7f1b8a0c1fc7321cac2`	affected	< b3b4b647313757a275be7f7f9d0415d0a90acf73
`1da177e4c3f41524e886b7f1b8a0c1fc7321cac2`	affected	< 591226398c1f93bd994678237ff0be229b19d3bb
`1da177e4c3f41524e886b7f1b8a0c1fc7321cac2`	affected	< 372bec8a01e2ab8eaa6851bdc346ede5f82dba99
`1da177e4c3f41524e886b7f1b8a0c1fc7321cac2`	affected	< 2922cf2583e590f51bed613a6fcd27b9aea83674
`1da177e4c3f41524e886b7f1b8a0c1fc7321cac2`	affected	< 7483fd5f6990f43cc266e94b3f50ce84856ebb97
`1da177e4c3f41524e886b7f1b8a0c1fc7321cac2`	affected	< 20b8520d1ef996173065f7abdde47b99136c0785
`1da177e4c3f41524e886b7f1b8a0c1fc7321cac2`	affected	< 611f538253d970f4d152003841544e875828d015

Linux

affected

Version	Status	Constraints
`2.6.12`	affected	—
`0`	unaffected	< 2.6.12
`5.10.271`	unaffected	≤ 5.10.*
`5.15.222`	unaffected	≤ 5.15.*
`6.1.189`	unaffected	≤ 6.1.*
`6.6.158`	unaffected	≤ 6.6.*
`6.12.111`	unaffected	≤ 6.12.*
`6.18.53`	unaffected	≤ 6.18.*
`7.2`	unaffected	≤ *

No data.

Vendor Product Versions

Linux

Version	Status	Scheme	Platform
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,b3b4b647313757a275be7f7f9d0415d0a90acf73)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,591226398c1f93bd994678237ff0be229b19d3bb)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,372bec8a01e2ab8eaa6851bdc346ede5f82dba99)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,2922cf2583e590f51bed613a6fcd27b9aea83674)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,7483fd5f6990f43cc266e94b3f50ce84856ebb97)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,20b8520d1ef996173065f7abdde47b99136c0785)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,611f538253d970f4d152003841544e875828d015)`	affected	code_commit	—
`[0,5.10.271)`	affected	semver	—
`[0,5.15.222)`	affected	semver	—
`[0,6.1.189)`	affected	semver	—
`[0,6.6.158)`	affected	semver	—
`[0,6.12.111)`	affected	semver	—
`[0,6.18.53)`	affected	semver	—

Linux

Version	Status	Scheme	Platform
`[5.10.271,5.11.0)`	unaffected	semver	—
`[5.15.222,5.16.0)`	unaffected	semver	—
`[6.1.189,6.2.0)`	unaffected	semver	—
`[6.6.158,6.7.0)`	unaffected	semver	—
`[6.12.111,6.13.0)`	unaffected	semver	—
`[6.18.53,6.19.0)`	unaffected	semver	—
`[7.2,*]`	unaffected	generic	—

Linux

Linux Kernel

Version	Status	Scheme	Platform
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,b3b4b647313757a275be7f7f9d0415d0a90acf73)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,591226398c1f93bd994678237ff0be229b19d3bb)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,372bec8a01e2ab8eaa6851bdc346ede5f82dba99)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,2922cf2583e590f51bed613a6fcd27b9aea83674)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,7483fd5f6990f43cc266e94b3f50ce84856ebb97)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,20b8520d1ef996173065f7abdde47b99136c0785)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,611f538253d970f4d152003841544e875828d015)`	affected	code_commit	—
`[0,5.10.271)`	affected	semver	—
`[0,5.15.222)`	affected	semver	—
`[0,6.1.189)`	affected	semver	—
`[0,6.6.158)`	affected	semver	—
`[0,6.12.111)`	affected	semver	—
`[0,6.18.53)`	affected	semver	—

Linux

Linux Kernel

Version	Status	Scheme	Platform
`[5.10.271,5.11.0)`	unaffected	semver	—
`[5.15.222,5.16.0)`	unaffected	semver	—
`[6.1.189,6.2.0)`	unaffected	semver	—
`[6.6.158,6.7.0)`	unaffected	semver	—
`[6.12.111,6.13.0)`	unaffected	semver	—
`[6.18.53,6.19.0)`	unaffected	semver	—
`[7.2,*]`	unaffected	generic	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
Ubuntu USN	USN-8961-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9019-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9020-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9022-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9023-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9024-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9025-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9026-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9029-1	Linux kernel (Raspberry Pi) vulnerabilities
Ubuntu USN	USN-9039-1	Linux kernel (Azure CVM) vulnerabilities
Ubuntu USN	USN-9040-1	Linux kernel (Low Latency NVIDIA) vulnerabilities
Ubuntu USN	USN-9066-1	Linux kernel (HWE) vulnerabilities
Ubuntu USN	USN-9091-1	Linux kernel (NVIDIA Tegra) vulnerabilities

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.187% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98912.mbox
https://git.kernel.org/stable/c/20b8520d1ef996173065f7abdde47b99136c0785
https://git.kernel.org/stable/c/2922cf2583e590f51bed613a6fcd27b9aea83674
https://git.kernel.org/stable/c/372bec8a01e2ab8eaa6851bdc346ede5f82dba99
https://git.kernel.org/stable/c/591226398c1f93bd994678237ff0be229b19d3bb
https://git.kernel.org/stable/c/611f538253d970f4d152003841544e875828d015
https://git.kernel.org/stable/c/7483fd5f6990f43cc266e94b3f50ce84856ebb97
https://git.kernel.org/stable/c/b3b4b647313757a275be7f7f9d0415d0a90acf73
https://nvd.nist.gov/vuln/detail/CVE-2026-98912
https://www.cve.org/CVERecord?id=CVE-2026-98912

History

Oct 29, 2026 12:15 PM Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
References		https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98912.mbox https://nvd.nist.gov/vuln/detail/CVE-2026-98912 https://www.cve.org/CVERecord?id=CVE-2026-98912
Metrics	threat_severity `None`	cvssV3_1 `{'score': 4.4, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L'}` threat_severity `Moderate`

Oct 23, 2026 6:00 PM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-787

Oct 23, 2026 4:30 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Linux linux
Vendors & Products		Linux linux

Oct 23, 2026 12:00 PM Description updated. Title updated. First appearance in the feed. Affected versions updated. Affected vendors updated. Added references View changes

Type	Values Removed	Values Added
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.
Title		ALSA: seq: oss: Reject reads that cannot fit the next event
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/20b8520d1ef996173065f7abdde47b99136c0785 https://git.kernel.org/stable/c/2922cf2583e590f51bed613a6fcd27b9aea83674 https://git.kernel.org/stable/c/372bec8a01e2ab8eaa6851bdc346ede5f82dba99 https://git.kernel.org/stable/c/591226398c1f93bd994678237ff0be229b19d3bb https://git.kernel.org/stable/c/611f538253d970f4d152003841544e875828d015 https://git.kernel.org/stable/c/7483fd5f6990f43cc266e94b3f50ce84856ebb97 https://git.kernel.org/stable/c/b3b4b647313757a275be7f7f9d0415d0a90acf73