medium
4.9
CWE
119
Advisory Published
CVE Published
Updated

CVE-2011-4086: Buffer Overflow

First published: Wed Oct 26 2011(Updated: )

journal_unmap_buffer()'s zap_buffer: code clears a lot of buffer head state ala discard_buffer(), but does not touch _Delay or _Unwritten as discard_buffer() does. This can be problematic in some areas of the ext4 code which assume that if they have found a buffer marked unwritten or delay, then it's a live one. They do not check whether a buffer is mapped, so jbd2's partial teardown can be problematic if they assume that this buffer head is still valid. (Mounting without a journal also avoids the bug, because with no journal we go to unmap_buffer(), which does the right thing). An unprivileged local user could use this flaw to crash the system.

Credit: secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel=3.0.25
Linux Linux kernel=3.1.2
Linux Linux kernel=3.0-rc2
Linux Linux kernel=3.2.19
Linux Linux kernel=3.0.22
Linux Linux kernel=3.0.5
Linux Linux kernel=3.2.18
Linux Linux kernel=3.0-rc7
Linux Linux kernel=3.1-rc1
Linux Linux kernel=3.1-rc4
Linux Linux kernel=3.2.5
Linux Linux kernel=3.0.18
Linux Linux kernel=3.0.6
Linux Linux kernel=3.0-rc4
Linux Linux kernel=3.0.11
Linux Linux kernel=3.0.34
Linux Linux kernel<=3.3
Linux Linux kernel=3.0.32
Linux Linux kernel=3.2-rc2
Linux Linux kernel=3.2.16
Linux Linux kernel=3.2-rc5
Linux Linux kernel=3.0.19
Linux Linux kernel=3.0.4
Linux Linux kernel=3.2-rc4
Linux Linux kernel=3.0.27
Linux Linux kernel=3.0-rc6
Linux Linux kernel=3.2.11
Linux Linux kernel=3.0.23
Linux Linux kernel=3.2.10
Linux Linux kernel=3.0.8
Linux Linux kernel=3.2.14
Linux Linux kernel=3.1
Linux Linux kernel=3.0-rc3
Linux Linux kernel=3.0.33
Linux Linux kernel=3.0.28
Linux Linux kernel=3.0-rc1
Linux Linux kernel=3.2.4
Linux Linux kernel=3.0.13
Linux Linux kernel=3.2.9
Linux Linux kernel=3.0.10
Linux Linux kernel=3.0-rc5
Linux Linux kernel=3.2.15
Linux Linux kernel=3.1-rc2
Linux Linux kernel=3.0.1
Linux Linux kernel=3.1.6
Linux Linux kernel=3.2.20
Linux Linux kernel=3.2.6
Linux Linux kernel=3.2.2
Linux Linux kernel=3.0.17
Linux Linux kernel=3.1.3
Linux Linux kernel=3.1.9
Linux Linux kernel=3.2-rc3
Linux Linux kernel=3.0.16
Linux Linux kernel=3.2.13
Linux Linux kernel=3.0.21
Linux Linux kernel=3.0.7
Linux Linux kernel=3.1.5
Linux Linux kernel=3.1.8
Linux Linux kernel=3.2.1
Linux Linux kernel=3.2.7
Linux Linux kernel=3.0.20
Linux Linux kernel=3.0.24
Linux Linux kernel=3.0.15
Linux Linux kernel=3.0.2
Linux Linux kernel=3.1.7
Linux Linux kernel=3.1.1
Linux Linux kernel=3.0.12
Linux Linux kernel=3.2-rc6
Linux Linux kernel=3.2.17
Linux Linux kernel=3.2-rc7
Linux Linux kernel=3.2.8
Linux Linux kernel=3.1.10
Linux Linux kernel=3.2
Linux Linux kernel=3.0.3
Linux Linux kernel=3.0.9
Linux Linux kernel=3.0.26
Linux Linux kernel=3.1.4
Linux Linux kernel=3.0.30
Linux Linux kernel=3.0.31
Linux Linux kernel=3.0.29
Linux Linux kernel=3.2.12
Linux Linux kernel=3.0.14
Linux Linux kernel=3.1-rc3
Linux Linux kernel=3.2.3
debian/linux-2.6

Remedy

https://github.com/torvalds/linux/commit/15291164b22a357cb211b618adfef4fa82fc0de3

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