Description
Some futex functions in futex.c for Linux kernel 2.6.x perform get_user calls while holding the mmap_sem semaphore, which could allow local users to cause a deadlock condition in do_page_fault by triggering get_user faults while another thread is executing mmap or other functions.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 4 | kernel +6 | 2.6.9-11.EL | RHSA-2005:420 |
Advisories 1
- RHSA-2005:420 Red Hat Security Advisory: Updated kernel packages available for Red Hat Enterprise Linux 4 Update 1 Red Hat Security Advisories (RHSA) · Jun 26, 2026
References
- http://linux.bkbits.net:8080/linux-2.6/cset%40421cfc11zFsK9gxvSJ2t__FCmuUd3Q
- http://lkml.org/lkml/2005/2/22/123
- oval:org.mitre.oval:def:10037 vdb-entry signature
- RHSA-2005:420 vendor-advisory
- FLSA:157459-3 vendor-advisory