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ubuntucveUbuntu.comUB:CVE-2011-4086
HistoryFeb 09, 2012 - 12:00 a.m.

CVE-2011-4086

2012-02-0900:00:00
ubuntu.com
ubuntu.com
23

4.9 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:N/I:N/A:C

0.0004 Low

EPSS

Percentile

5.3%

The journal_unmap_buffer function in fs/jbd2/transaction.c in the Linux
kernel before 3.3.1 does not properly handle the _Delay and _Unwritten
buffer head states, which allows local users to cause a denial of service
(system crash) by leveraging the presence of an ext4 filesystem that was
mounted with a journal.

Bugs

Notes

Author Note
apw This is sitting in Ted Ts’o’s dev tree presumably waiting on the 3.4 merge window, the issue is masked from v3.2 onwards by other commits. The commit itself is marked for stable and for now I suspect we should wait for it. We have no stable commit id as yet, see: jbd2: clear BH_Delay & BH_Unwritten in journal_unmap_buffer this has now appeared upstream (see below)

4.9 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:N/I:N/A:C

0.0004 Low

EPSS

Percentile

5.3%