SB2026102401 - Out-of-bounds write in Linux kernel damon

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds write (CVE-ID: CVE-2026-98918)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to corrupt kernel memory and cause a denial of service.

The vulnerability exists due to an out-of-bounds write in the Linux kernel's damon_ptep_mkold() function when an unaligned sampling address is passed to arm64 page-table access-flag clearing helpers. A local privileged user can trigger affected DAMON sampling to cause the page-table walk to clear access flags beyond the sampled block and potentially beyond the page-table page, corrupting adjacent kernel memory and causing a denial of service.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/d5208de0799c506d3315b6f96d034c38e4509dbb
• https://git.kernel.org/stable/c/f166586f74dd5d9cbadaabf86ef81c8ddf6cafa7