SB20260812392 - Out-of-bounds write in Linux kernel iomap
Published: August 12, 2026
Security Bulletin ID
SB20260812392
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-2026-68145)
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 ifs_set_range_dirty() when processing a zero-length range. A local user can trigger a user buffer fault that results in copied == 0 during a write operation to cause a denial of service.
The issue is reachable from __iomap_write_end() when copy_folio_from_iter_atomic() returns 0 and the folio is already uptodate.
Remediation
Install update from vendor's website.