Incorrect comparison in Linux kernel - CVE-2026-98912

Vulnerability identifier: #VU157596

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98912

CWE-ID: CWE-697

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause data to be written beyond the requested userspace buffer length.

The vulnerability exists due to an inverted buffer-length comparison in snd_seq_oss_read() when processing reads of queued OSS sequencer events. A local user can request a read shorter than the next queued event to cause the event to be copied beyond the requested userspace buffer length.

Linux kernel
Ubuntu
linux-nvidia-tegra (Ubuntu package)
linux-nvidia-tegra-igx (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-aws (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-nvidia-tegra (Ubuntu package) - update to 5.15.0-1070.72
linux-nvidia-tegra-igx (Ubuntu package) - update to 5.15.0-1059.59
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1070.72~20.04.1
linux (Ubuntu package) - update to 7.0.0-42.42
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

• 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

• Incorrect comparison in Linux kernel seq oss
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more
• Ubuntu update for linux-nvidia-tegra, linux-nvidia-tegra-5.15, linux-nvidia-tegra-igx
• Ubuntu update for linux, linux-aws, linux-aws-5.15 and more