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In the Linux kernel, the following vulnerability has been resolved: bpf: Reset register bounds before narrowing retval range in check_mem_access()… (CVE-2026-72111)

0
Unknown
Published: 08/15/2026 (08/15/2026, 06:32:12 UTC)
Source: GCVE Database

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Reset register bounds before narrowing retval range in check_mem_access() When the BPF verifier processes a context load of an LSM hook return value, it calls __mark_reg_s32_range() to narrow the register to the hook's valid range. However, __mark_reg_s32_range() intersects the new range with the register's existing bounds using max_t()/min_t() rather than replacing them. If the destination register carries stale bounds from a prior instruction (e.g. BPF_MOV64_IMM), the intersection can produce a range narrower than reality. The verifier then believes it knows the register's exact value, while at runtime the actual hook return value is loaded, creating a verifier/runtime mismatch that can be used to bypass BPF memory safety checks. The else branch already calls mark_reg_unknown() to reset register state before any narrowing. Apply the same reset in the is_retval path so stale bounds are cleared before __mark_reg_s32_range() intersects.

Technical Details

Gcve Source
db.gcve.eu
Osv Id
GHSA-vhcf-p8jc-x5f6
Osv Schema Version
1.4.0
Aliases
["CVE-2026-72111"]
Ecosystems
[]
Database Specific Severity
null
Cvss Version
null

Threat ID: 6a808b76bf8831d539500131

Added to database: 08/15/2026, 15:53:26 UTC

Last updated: 08/15/2026, 15:54:50 UTC

Views: 1

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