Title: Linux Kernel Futex Local Deadlock Denial Of Service Vulnerability
Severity: MODERATE
Description:
The Linux kernel provides a mutex functionality, 'Fast Userspace muTexes' (futex) as a part of fast userland memory locking and semaphores.
The Linux kernel futex functions are reported prone to a local denial of service vulnerability. The issue is reported to manifest because several futex functions perform 'get_user()' calls and at the same time hold mmap_sem for reading purposes. It is reported that if the 'get_user()' call fails and a separate thread is in mmap, or alternatively elsewhere holding/waiting for 'down_write' on the same semaphore, do_page_fault will deadlock.
A local attacker may potentially leverage this issue to trigger a kernel deadlock and potentially deny service for legitimate users.
This vulnerability is reported to exist in the 2.6 Linux kernel tree.
Affected Products:
- Linux kernel 2.5.0 .0
- Linux kernel 2.5.1
- Linux kernel 2.5.10
- Linux kernel 2.5.11
- Linux kernel 2.5.12
- Linux kernel 2.5.13
- Linux kernel 2.5.14
- Linux kernel 2.5.15
- Linux kernel 2.5.16
- Linux kernel 2.5.17
- Linux kernel 2.5.18
- Linux kernel 2.5.19
- Linux kernel 2.5.2
- Linux kernel 2.5.20
- Linux kernel 2.5.21
- Linux kernel 2.5.22
- Linux kernel 2.5.23
- Linux kernel 2.5.24
- Linux kernel 2.5.25
- Linux kernel 2.5.26
- Linux kernel 2.5.27
- Linux kernel 2.5.28
- Linux kernel 2.5.29
- Linux kernel 2.5.3
- Linux kernel 2.5.30
- Linux kernel 2.5.31
- Linux kernel 2.5.32
- Linux kernel 2.5.33
- Linux kernel 2.5.34
- Linux kernel 2.5.35
- Linux kernel 2.5.36
- Linux kernel 2.5.37
- Linux kernel 2.5.38
- Linux kernel 2.5.39
- Linux kernel 2.5.4
- Linux kernel 2.5.40
- Linux kernel 2.5.41
- Linux kernel 2.5.42
- Linux kernel 2.5.43
- Linux kernel 2.5.44
- Linux kernel 2.5.45
- Linux kernel 2.5.46
- Linux kernel 2.5.47
- Linux kernel 2.5.48
- Linux kernel 2.5.49
- Linux kernel 2.5.5
- Linux kernel 2.5.50
- Linux kernel 2.5.51
- Linux kernel 2.5.52
- Linux kernel 2.5.53
- Linux kernel 2.5.54
- Linux kernel 2.5.55
- Linux kernel 2.5.56
- Linux kernel 2.5.57
- Linux kernel 2.5.58
- Linux kernel 2.5.59
- Linux kernel 2.5.6
- Linux kernel 2.5.60
- Linux kernel 2.5.61
- Linux kernel 2.5.62
- Linux kernel 2.5.63
- Linux kernel 2.5.64
- Linux kernel 2.5.65
- Linux kernel 2.5.66
- Linux kernel 2.5.67
- Linux kernel 2.5.68
- Linux kernel 2.5.69
- Linux kernel 2.5.7
- Linux kernel 2.5.8
- Linux kernel 2.5.9
- Linux kernel 2.6.0
- Linux kernel 2.6.0 -test1
- Linux kernel 2.6.0 -test10
- Linux kernel 2.6.0 -test11
- Linux kernel 2.6.0 -test2
- Linux kernel 2.6.0 -test3
- Linux kernel 2.6.0 -test4
- Linux kernel 2.6.0 -test5
- Linux kernel 2.6.0 -test6
- Linux kernel 2.6.0 -test7
- Linux kernel 2.6.0 -test8
- Linux kernel 2.6.0 -test9
- Linux kernel 2.6.0 -test9-CVS
- Linux kernel 2.6.0 .10
- Linux kernel 2.6.1
- Linux kernel 2.6.1 -rc1
- Linux kernel 2.6.1 -rc2
- Linux kernel 2.6.10
- Linux kernel 2.6.10 rc2
- Linux kernel 2.6.11
- Linux kernel 2.6.11 -rc2
- Linux kernel 2.6.11 -rc3
- Linux kernel 2.6.11 -rc4
- Linux kernel 2.6.11 .5
- Linux kernel 2.6.11 .6
- Linux kernel 2.6.2
- Linux kernel 2.6.3
- Linux kernel 2.6.4
- Linux kernel 2.6.5
- Linux kernel 2.6.6
- Linux kernel 2.6.6 rc1
- Linux kernel 2.6.7
- Linux kernel 2.6.7 rc1
- Linux kernel 2.6.8
- Linux kernel 2.6.8 rc1
- Linux kernel 2.6.8 rc2
- Linux kernel 2.6.8 rc3
- Linux kernel 2.6.9
- MandrakeSoft Linux Mandrake 10.1.0
- MandrakeSoft Linux Mandrake 10.1.0 x86_64
- RedHat Desktop 4.0.0
- RedHat Enterprise Linux AS 4
- RedHat Enterprise Linux ES 4
- RedHat Enterprise Linux WS 4
- RedHat Fedora Core2
- RedHat Fedora Core3
- RedHat Fedora Core4
- S.u.S.E. Linux Enterprise Server 9
- S.u.S.E. Linux Personal 9.1.0
- S.u.S.E. Linux Personal 9.1.0 x86_64
- S.u.S.E. Linux Personal 9.2.0
- S.u.S.E. Linux Personal 9.2.0 x86_64
- Trustix Secure Linux 3.0.0
- Ubuntu Ubuntu Linux 4.1.0 ia32
- Ubuntu Ubuntu Linux 4.1.0 ia64
- Ubuntu Ubuntu Linux 4.1.0 ppc
- Ubuntu Ubuntu Linux 5.0.0 4 amd64
- Ubuntu Ubuntu Linux 5.0.0 4 i386
- Ubuntu Ubuntu Linux 5.0.0 4 powerpc
References:
- Olof Johansson: Re: [PATCH/RFC] Futex mmap_sem deadlock
- RedHat: RHSA-2005:420-24 - kernel
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