Title: Linux Kernel eCryptfs Lower Dentry Null Pointer Dereference Local Denial of Service Vulnerability
Severity: MODERATE
Description:
The Linux kernel is prone to a local denial-of-service vulnerability in the 'eCryptfs' component. This issue occurs in the 'encryptds_read_update_a_time()' and the 'encryptfs_getxattr()' functions. Specifically, when invoking the 'vfs_unlink() function on the lower 'dentry', 'd_delete() functions will turn the 'dentry' into a negative value when 'd_count' is set to 1. This will cause a NULL-pointer dereference when a read or write is performed on the negative dentry's 'dinode'.
Attackers can exploit this issue to corrupt memory, resulting in a denial-of-service condition. Given the nature of this issue, attackers may also be able to run arbitrary code, but this has not been confirmed.
Versions prior to Linux kernel 2.6.31.2 are vulnerable.
Affected Products:
- Debian Linux 4.0
- Debian Linux 4.0 alpha
- Debian Linux 4.0 amd64
- Debian Linux 4.0 arm
- Debian Linux 4.0 hppa
- Debian Linux 4.0 ia-32
- Debian Linux 4.0 ia-64
- Debian Linux 4.0 m68k
- Debian Linux 4.0 mips
- Debian Linux 4.0 mipsel
- Debian Linux 4.0 powerpc
- Debian Linux 4.0 s/390
- Debian Linux 4.0 sparc
- 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
- Linux kernel 2.6.10 rc2
- Linux kernel 2.6.11
- 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 .11
- Linux kernel 2.6.11 .12
- Linux kernel 2.6.11 .4
- Linux kernel 2.6.11 .5
- Linux kernel 2.6.11 .6
- Linux kernel 2.6.11 .7
- Linux kernel 2.6.11 .8
- Linux kernel 2.6.11.4
- Linux kernel 2.6.12
- Linux kernel 2.6.12
- Linux kernel 2.6.12 -rc1
- Linux kernel 2.6.12 -rc4
- Linux kernel 2.6.12 -rc5
- Linux kernel 2.6.12 .1
- Linux kernel 2.6.12 .12
- Linux kernel 2.6.12 .2
- Linux kernel 2.6.12 .22
- Linux kernel 2.6.12 .3
- Linux kernel 2.6.12 .4
- Linux kernel 2.6.12 .5
- Linux kernel 2.6.12 .6
- Linux kernel 2.6.13
- Linux kernel 2.6.13
- Linux kernel 2.6.13 -rc1
- Linux kernel 2.6.13 -rc4
- Linux kernel 2.6.13 -rc6
- Linux kernel 2.6.13 -rc7
- Linux kernel 2.6.13 .1
- Linux kernel 2.6.13 .2
- Linux kernel 2.6.13 .3
- Linux kernel 2.6.13 .4
- Linux kernel 2.6.14
- Linux kernel 2.6.14
- Linux kernel 2.6.14 -rc1
- Linux kernel 2.6.14 -rc2
- Linux kernel 2.6.14 -rc3
- Linux kernel 2.6.14 -rc4
- Linux kernel 2.6.14 .1
- Linux kernel 2.6.14 .2
- Linux kernel 2.6.14 .3
- Linux kernel 2.6.14.4
- Linux kernel 2.6.14.5
- Linux kernel 2.6.15
- Linux kernel 2.6.15
- Linux kernel 2.6.15 -rc1
- Linux kernel 2.6.15 -rc2
- Linux kernel 2.6.15 -rc3
- Linux kernel 2.6.15 -rc4
- Linux kernel 2.6.15 -rc5
- Linux kernel 2.6.15 -rc6
- Linux kernel 2.6.15 .4
- Linux kernel 2.6.15-27.48
- Linux kernel 2.6.15.1
- Linux kernel 2.6.15.11
- Linux kernel 2.6.15.2
- Linux kernel 2.6.15.3
- Linux kernel 2.6.15.5
- Linux kernel 2.6.15.6
- Linux kernel 2.6.16
- Linux kernel 2.6.16
- Linux kernel 2.6.16 -rc1
- Linux kernel 2.6.16 .1
- Linux kernel 2.6.16 .11
- Linux kernel 2.6.16 .12
- Linux kernel 2.6.16 .19
- Linux kernel 2.6.16 .23
- Linux kernel 2.6.16 .7
- Linux kernel 2.6.16 .9
- Linux kernel 2.6.16 13
- Linux kernel 2.6.16 27
- Linux kernel 2.6.16.16
- Linux kernel 2.6.16.17
- Linux kernel 2.6.16.18
- Linux kernel 2.6.16.2
- Linux kernel 2.6.16.21
- Linux kernel 2.6.16.3
- Linux kernel 2.6.16.4
- Linux kernel 2.6.16.5
- Linux kernel 2.6.16.8
- Linux kernel 2.6.17
- Linux kernel 2.6.17
- Linux kernel 2.6.17
- Linux kernel 2.6.17
- Linux kernel 2.6.17 -rc5
- Linux kernel 2.6.17 .8
- Linux kernel 2.6.17.1
- Linux kernel 2.6.17.10
- Linux kernel 2.6.17.11
- Linux kernel 2.6.17.12
- Linux kernel 2.6.17.13
- Linux kernel 2.6.17.14
- Linux kernel 2.6.17.2
- Linux kernel 2.6.17.3
- Linux kernel 2.6.17.4
- Linux kernel 2.6.17.5
- Linux kernel 2.6.17.6
- Linux kernel 2.6.17.7
- Linux kernel 2.6.17.9
- Linux kernel 2.6.18
- Linux kernel 2.6.18
- Linux kernel 2.6.18 .1
- Linux kernel 2.6.18-53
- Linux kernel 2.6.18-8.1.8.el5
- Linux kernel 2.6.18.3
- Linux kernel 2.6.18.4
- Linux kernel 2.6.19
- Linux kernel 2.6.19 -rc1
- Linux kernel 2.6.19 -rc2
- Linux kernel 2.6.19 -rc3
- Linux kernel 2.6.19 -rc4
- Linux kernel 2.6.19 -rc6
- Linux kernel 2.6.19.1
- Linux kernel 2.6.19.1
- Linux kernel 2.6.19.2
- Linux kernel 2.6.2
- Linux kernel 2.6.20
- Linux kernel 2.6.20
- Linux kernel 2.6.20 -git5
- Linux kernel 2.6.20-2
- Linux kernel 2.6.20-rc2
- Linux kernel 2.6.20.1
- Linux kernel 2.6.20.11
- Linux kernel 2.6.20.13
- Linux kernel 2.6.20.15
- Linux kernel 2.6.20.2
- Linux kernel 2.6.20.3
- Linux kernel 2.6.20.4
- Linux kernel 2.6.20.5
- Linux kernel 2.6.20.8
- Linux kernel 2.6.20.9
- Linux kernel 2.6.21
- Linux kernel 2.6.21 .1
- Linux kernel 2.6.21 4
- Linux kernel 2.6.21-RC3
- Linux kernel 2.6.21-RC3
- Linux kernel 2.6.21-RC4
- Linux kernel 2.6.21-RC5
- Linux kernel 2.6.21-RC6
- Linux kernel 2.6.21-git8
- Linux kernel 2.6.21.2
- Linux kernel 2.6.21.3
- Linux kernel 2.6.21.6
- Linux kernel 2.6.21.7
- Linux kernel 2.6.22
- Linux kernel 2.6.22-rc1
- Linux kernel 2.6.22-rc7
- Linux kernel 2.6.22.1
- Linux kernel 2.6.22.11
- Linux kernel 2.6.22.12
- Linux kernel 2.6.22.13
- Linux kernel 2.6.22.14
- Linux kernel 2.6.22.15
- Linux kernel 2.6.22.16
- Linux kernel 2.6.22.17
- Linux kernel 2.6.22.2
- Linux kernel 2.6.22.3
- Linux kernel 2.6.22.4
- Linux kernel 2.6.22.5
- Linux kernel 2.6.22.6
- Linux kernel 2.6.22.7
- Linux kernel 2.6.22.8
- Linux kernel 2.6.23
- Linux kernel 2.6.23-rc1
- Linux kernel 2.6.23-rc2
- Linux kernel 2.6.23.09
- Linux kernel 2.6.23.1
- Linux kernel 2.6.23.10
- Linux kernel 2.6.23.14
- Linux kernel 2.6.23.2
- Linux kernel 2.6.23.3
- Linux kernel 2.6.23.4
- Linux kernel 2.6.23.5
- Linux kernel 2.6.23.6
- Linux kernel 2.6.23.7
- Linux kernel 2.6.24
- Linux kernel 2.6.24-git13
- Linux kernel 2.6.24-rc1
- Linux kernel 2.6.24-rc2
- Linux kernel 2.6.24-rc3
- Linux kernel 2.6.24-rc4
- Linux kernel 2.6.24-rc5
- Linux kernel 2.6.24.1
- Linux kernel 2.6.24.2
- Linux kernel 2.6.24.6
- Linux kernel 2.6.25
- Linux kernel 2.6.25
- Linux kernel 2.6.25 .15
- Linux kernel 2.6.25 19
- Linux kernel 2.6.25-rc1
- Linux kernel 2.6.25.1
- Linux kernel 2.6.25.10
- Linux kernel 2.6.25.11
- Linux kernel 2.6.25.12
- Linux kernel 2.6.25.13
- Linux kernel 2.6.25.2
- Linux kernel 2.6.25.3
- Linux kernel 2.6.25.4
- Linux kernel 2.6.25.5
- Linux kernel 2.6.25.6
- Linux kernel 2.6.25.7
- Linux kernel 2.6.25.8
- Linux kernel 2.6.25.9
- Linux kernel 2.6.26
- Linux kernel 2.6.26 -rc6
- Linux kernel 2.6.26 .5
- Linux kernel 2.6.26 7
- Linux kernel 2.6.26-rc5-git1
- Linux kernel 2.6.26.1
- Linux kernel 2.6.26.3
- Linux kernel 2.6.26.4
- Linux kernel 2.6.26.6
- Linux kernel 2.6.27
- Linux kernel 2.6.27 -rc6-git6
- Linux kernel 2.6.27 -rc8
- Linux kernel 2.6.27 -rc8-git5
- Linux kernel 2.6.27 .5
- Linux kernel 2.6.27 12
- Linux kernel 2.6.27 3
- Linux kernel 2.6.27 6
- Linux kernel 2.6.27-rc1
- Linux kernel 2.6.27-rc2
- Linux kernel 2.6.27-rc5
- Linux kernel 2.6.27-rc6
- Linux kernel 2.6.27.12
- Linux kernel 2.6.27.13
- Linux kernel 2.6.27.14
- Linux kernel 2.6.27.24
- Linux kernel 2.6.27.8
- Linux kernel 2.6.28
- Linux kernel 2.6.28 -git7
- Linux kernel 2.6.28 -rc1
- Linux kernel 2.6.28 -rc5
- Linux kernel 2.6.28 -rc7
- Linux kernel 2.6.28.1
- Linux kernel 2.6.28.2
- Linux kernel 2.6.28.3
- Linux kernel 2.6.28.4
- Linux kernel 2.6.28.5
- Linux kernel 2.6.28.6
- Linux kernel 2.6.28.8
- Linux kernel 2.6.28.9
- Linux kernel 2.6.29
- Linux kernel 2.6.29-git1
- Linux kernel 2.6.29-git14
- Linux kernel 2.6.29-git8
- Linux kernel 2.6.29-rc1
- Linux kernel 2.6.29-rc2
- Linux kernel 2.6.29-rc2-git1
- Linux kernel 2.6.29.1
- Linux kernel 2.6.29.4
- Linux kernel 2.6.3
- Linux kernel 2.6.30
- Linux kernel 2.6.30 -rc1
- Linux kernel 2.6.30-rc2
- Linux kernel 2.6.30-rc3
- Linux kernel 2.6.30-rc5
- Linux kernel 2.6.30-rc6
- Linux kernel 2.6.30.1
- Linux kernel 2.6.30.3
- Linux kernel 2.6.30.4
- Linux kernel 2.6.30.5
- Linux kernel 2.6.31
- Linux kernel 2.6.31-rc1
- Linux kernel 2.6.31-rc3
- Linux kernel 2.6.31-rc5-git3
- Linux kernel 2.6.31-rc6
- Linux kernel 2.6.31-rc7
- Linux kernel 2.6.31-rc7
- Linux kernel 2.6.31-rc8
- Linux kernel 2.6.31-rc9
- 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 2.6.8.1
- Linux kernel 2.6.9
- RedHat Fedora 10
- 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 Enterprise Linux 2.0.0
- Trustix Secure Linux 2.0.0
- Trustix Secure Linux 2.1.0
- Trustix Secure Linux 2.2.0
- 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:
- CVE: CVE-2009-2908
- Josh Bressers: (CVE-2009-2908) CVE-2009-2908 kernel ecryptfs NULL pointer dereference
- Linux: Linux 2.6.31.2
- Tyler Hicks: eCryptfs: Prevent lower dentry from going negative during unlink
- kernel.org: Linux kernel Homepage
Juniper Networks provides this content via a wide variety of sources and production methods. If notified of errors or omissions in the content of this page, Juniper Networks, at its discretion, will modify or remove the page or leave the content as is, depending on various factors including but not limited to the reputation and authority of the party providing the notification. Please use the contact information displayed elsewhere on this page to report any errors or omissions regarding the content on this page.
