SB20261022235 - Out-of-bounds read in Linux kernel s390 kernel

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2026-98648)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause an out-of-bounds read that may disclose sensitive information or cause a denial of service.

The vulnerability exists due to an out-of-bounds read in the Linux kernel s390/uv function find_secret_in_page when searching a secret-list page using the overall secret count rather than the number of secrets stored on that page. A local user can trigger a search for a secret located on a subsequent page or absent from the list to read beyond the page's secret array, potentially disclosing sensitive information or causing a denial of service.

The issue occurs when the system has more than 85 secrets, exceeding the number of entries held on one page.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/04bb5b2eb9f1d56110f14d3a4e31fa2c65fb026f
• https://git.kernel.org/stable/c/116bba758533a139bbede8d717a1371bd6d890f6
• https://git.kernel.org/stable/c/f47190b08b71e8482072978373ee88cb2dfbdaf4