SB2026082172 - Reachable assertion in Linux kernel proc
Published: August 21, 2026
Security Bulletin ID
SB2026082172
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Reachable assertion (CVE-ID: CVE-2026-72173)
CWE-ID: CWE-617 - Reachable Assertion
CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a local user to trigger a kernel warning.
The vulnerability exists due to a reachable stale assertion in pagemap_pmd_range_thp() in fs/proc/task_mmu.c when processing pagemap PMD entries. A local user can trigger processing of a PMD device-private entry to trigger a kernel warning.
The condition involves device-private entries at the PMD level.
Remediation
Install update from vendor's website.