Description
Linux kernel before 2.6.16.21 and 2.6.17, when running on PowerPC, does not perform certain required access_ok checks, which allows local users to read arbitrary kernel memory on 64-bit systems (signal_64.c) and cause a denial of service (crash) and possibly read kernel memory on 32-bit systems (signal_32.c).
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 +8 | 2.6.9-42.EL | RHSA-2006:0575 |
Advisories 1
- RHSA-2006:0575 Red Hat Security Advisory: Updated kernel packages available for Red Hat Enterprise Linux 4 Update 4 Red Hat Security Advisories (RHSA) · Jun 26, 2026
References
- 20703 third-party-advisory
- ADV-2006-2451 vdb-entry
- SUSE-SA:2006:042 vendor-advisory
- 20060623 rPSA-2006-0110-1 kernel mailing-list
- SUSE-SA:2006:047 vendor-advisory
- oval:org.mitre.oval:def:10040 vdb-entry signature
- http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=7c85d1f9d358b24c5b05c3a2783a78423775a080
- 2006-0037 vendor-advisory
- RHSA-2006:0575 vendor-advisory
- https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=194215
- USN-311-1 vendor-advisory
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.16.21
- 21465 third-party-advisory
- 20831 third-party-advisory
- 21498 third-party-advisory
- 18616 vdb-entry
- http://support.avaya.com/elmodocs2/security/ASA-2006-200.htm
- 22417 third-party-advisory
- 20991 third-party-advisory
- 21179 third-party-advisory