SB2026082848 - Out-of-bounds write in Linux kernel mm
Published: August 28, 2026
Security Bulletin ID
SB2026082848
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds write (CVE-ID: CVE-2026-80718)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds write in pcpu_create_chunk() when initializing the populated bitmap for percpu chunks with more than one unit. A local user can trigger the vulnerable code path to cause a denial of service.
The issue occurs because a total backing allocation page count is used to update a bitmap sized only for per-unit page offsets.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/01504da375f5b19df195cb1cb1cf1dd184318f97
- https://git.kernel.org/stable/c/32134cf9211b83bed9076d0739c5906fbea4c763
- https://git.kernel.org/stable/c/5c7fc39bf19abb38a996aaad77b3e3a8f48581c3
- https://git.kernel.org/stable/c/5f43d2c1bea280dcdfabaf156c25e7402fb8039f
- https://git.kernel.org/stable/c/6fc7da2a052f2825fff785e860e67183f5acaaba
- https://git.kernel.org/stable/c/89b1b79c308818a715e75f28744b70d8940a07c9
- https://git.kernel.org/stable/c/92c43ac3c2b09eb16162e8144e73c00b7c3e29d6
- https://git.kernel.org/stable/c/a6940b84c8c035da465b7165fdfcfb005545724e