Linux kernel before 2.6.18, when running on x86_64 systems, does not properly save or restore EFLAGS during a context switch, which allows local users to cause a denial of service (crash) by causing SYSENTER to set an NT flag, which can trigger a crash on the IRET of the next task.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Linux_kernel | Linux | * | 2.6.17 (including) |
| Red Hat Enterprise Linux 5 | RedHat | kernel-0:2.6.18-92.1.18.el5 | * |
| Linux-source-2.6.15 | Ubuntu | dapper | * |
| Linux-source-2.6.17 | Ubuntu | edgy | * |
References
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=658fdbef66e5e9be79b457edc2cbbb3add840aa9
- http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=658fdbef66e5e9be79b457edc2cbbb3add840aa9
- http://secunia.com/advisories/24098
- http://secunia.com/advisories/25691
- http://secunia.com/advisories/26620
- http://secunia.com/advisories/26994
- http://secunia.com/advisories/32485
- http://www.debian.org/security/2007/dsa-1381
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.18
- http://www.kernel.org/pub/linux/kernel/v2.6/snapshots/patch-2.6.18-git13.log
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:171
- http://www.redhat.com/support/errata/RHSA-2008-0957.html
- http://www.securityfocus.com/archive/1/471457
- http://www.securityfocus.com/bid/26060
- http://www.ubuntu.com/usn/usn-416-1
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9554
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=658fdbef66e5e9be79b457edc2cbbb3add840aa9
- http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=658fdbef66e5e9be79b457edc2cbbb3add840aa9
- http://secunia.com/advisories/24098
- http://secunia.com/advisories/25691
- http://secunia.com/advisories/26620
- http://secunia.com/advisories/26994
- http://secunia.com/advisories/32485
- http://www.debian.org/security/2007/dsa-1381
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.18
- http://www.kernel.org/pub/linux/kernel/v2.6/snapshots/patch-2.6.18-git13.log
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:171
- http://www.redhat.com/support/errata/RHSA-2008-0957.html
- http://www.securityfocus.com/archive/1/471457
- http://www.securityfocus.com/bid/26060
- http://www.ubuntu.com/usn/usn-416-1
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9554