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
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux-2.6 | ||
| Linux kernel | =3.0.25 | |
| Linux kernel | =3.1.2 | |
| Linux kernel | =3.0-rc2 | |
| Linux kernel | =3.2.19 | |
| Linux kernel | =3.0.22 | |
| Linux kernel | =3.0.5 | |
| Linux kernel | =3.2.18 | |
| Linux kernel | =3.0-rc7 | |
| Linux kernel | =3.1-rc1 | |
| Linux kernel | =3.1-rc4 | |
| Linux kernel | =3.2.5 | |
| Linux kernel | =3.0.18 | |
| Linux kernel | =3.0.6 | |
| Linux kernel | =3.0-rc4 | |
| Linux kernel | =3.0.11 | |
| Linux kernel | =3.0.34 | |
| Linux kernel | <=3.3 | |
| Linux kernel | =3.0.32 | |
| Linux kernel | =3.2-rc2 | |
| Linux kernel | =3.2.16 | |
| Linux kernel | =3.2-rc5 | |
| Linux kernel | =3.0.19 | |
| Linux kernel | =3.0.4 | |
| Linux kernel | =3.2-rc4 | |
| Linux kernel | =3.0.27 | |
| Linux kernel | =3.0-rc6 | |
| Linux kernel | =3.2.11 | |
| Linux kernel | =3.0.23 | |
| Linux kernel | =3.2.10 | |
| Linux kernel | =3.0.8 | |
| Linux kernel | =3.2.14 | |
| Linux kernel | =3.1 | |
| Linux kernel | =3.0-rc3 | |
| Linux kernel | =3.0.33 | |
| Linux kernel | =3.0.28 | |
| Linux kernel | =3.0-rc1 | |
| Linux kernel | =3.2.4 | |
| Linux kernel | =3.0.13 | |
| Linux kernel | =3.2.9 | |
| Linux kernel | =3.0.10 | |
| Linux kernel | =3.0-rc5 | |
| Linux kernel | =3.2.15 | |
| Linux kernel | =3.1-rc2 | |
| Linux kernel | =3.0.1 | |
| Linux kernel | =3.1.6 | |
| Linux kernel | =3.2.20 | |
| Linux kernel | =3.2.6 | |
| Linux kernel | =3.2.2 | |
| Linux kernel | =3.0.17 | |
| Linux kernel | =3.1.3 | |
| Linux kernel | =3.1.9 | |
| Linux kernel | =3.2-rc3 | |
| Linux kernel | =3.0.16 | |
| Linux kernel | =3.2.13 | |
| Linux kernel | =3.0.21 | |
| Linux kernel | =3.0.7 | |
| Linux kernel | =3.1.5 | |
| Linux kernel | =3.1.8 | |
| Linux kernel | =3.2.1 | |
| Linux kernel | =3.2.7 | |
| Linux kernel | =3.0.20 | |
| Linux kernel | =3.0.24 | |
| Linux kernel | =3.0.15 | |
| Linux kernel | =3.0.2 | |
| Linux kernel | =3.1.7 | |
| Linux kernel | =3.1.1 | |
| Linux kernel | =3.0.12 | |
| Linux kernel | =3.2-rc6 | |
| Linux kernel | =3.2.17 | |
| Linux kernel | =3.2-rc7 | |
| Linux kernel | =3.2.8 | |
| Linux kernel | =3.1.10 | |
| Linux kernel | =3.2 | |
| Linux kernel | =3.0.3 | |
| Linux kernel | =3.0.9 | |
| Linux kernel | =3.0.26 | |
| Linux kernel | =3.1.4 | |
| Linux kernel | =3.0.30 | |
| Linux kernel | =3.0.31 | |
| Linux kernel | =3.0.29 | |
| Linux kernel | =3.2.12 | |
| Linux kernel | =3.0.14 | |
| Linux kernel | =3.1-rc3 | |
| Linux kernel | =3.2.3 | |
| Linux Kernel | <=3.3 | |
| Linux Kernel | =3.0-rc1 | |
| Linux Kernel | =3.0-rc2 | |
| Linux Kernel | =3.0-rc3 | |
| Linux Kernel | =3.0-rc4 | |
| Linux Kernel | =3.0-rc5 | |
| Linux Kernel | =3.0-rc6 | |
| Linux Kernel | =3.0-rc7 | |
| Linux Kernel | =3.0.1 | |
| Linux Kernel | =3.0.2 | |
| Linux Kernel | =3.0.3 | |
| Linux Kernel | =3.0.4 | |
| Linux Kernel | =3.0.5 | |
| Linux Kernel | =3.0.6 | |
| Linux Kernel | =3.0.7 | |
| Linux Kernel | =3.0.8 | |
| Linux Kernel | =3.0.9 | |
| Linux Kernel | =3.0.10 | |
| Linux Kernel | =3.0.11 | |
| Linux Kernel | =3.0.12 | |
| Linux Kernel | =3.0.13 | |
| Linux Kernel | =3.0.14 | |
| Linux Kernel | =3.0.15 | |
| Linux Kernel | =3.0.16 | |
| Linux Kernel | =3.0.17 | |
| Linux Kernel | =3.0.18 | |
| Linux Kernel | =3.0.19 | |
| Linux Kernel | =3.0.20 | |
| Linux Kernel | =3.0.21 | |
| Linux Kernel | =3.0.22 | |
| Linux Kernel | =3.0.23 | |
| Linux Kernel | =3.0.24 | |
| Linux Kernel | =3.0.25 | |
| Linux Kernel | =3.0.26 | |
| Linux Kernel | =3.0.27 | |
| Linux Kernel | =3.0.28 | |
| Linux Kernel | =3.0.29 | |
| Linux Kernel | =3.0.30 | |
| Linux Kernel | =3.0.31 | |
| Linux Kernel | =3.0.32 | |
| Linux Kernel | =3.0.33 | |
| Linux Kernel | =3.0.34 | |
| Linux Kernel | =3.1 | |
| Linux Kernel | =3.1-rc1 | |
| Linux Kernel | =3.1-rc2 | |
| Linux Kernel | =3.1-rc3 | |
| Linux Kernel | =3.1-rc4 | |
| Linux Kernel | =3.1.1 | |
| Linux Kernel | =3.1.2 | |
| Linux Kernel | =3.1.3 | |
| Linux Kernel | =3.1.4 | |
| Linux Kernel | =3.1.5 | |
| Linux Kernel | =3.1.6 | |
| Linux Kernel | =3.1.7 | |
| Linux Kernel | =3.1.8 | |
| Linux Kernel | =3.1.9 | |
| Linux Kernel | =3.1.10 | |
| Linux Kernel | =3.2 | |
| Linux Kernel | =3.2-rc2 | |
| Linux Kernel | =3.2-rc3 | |
| Linux Kernel | =3.2-rc4 | |
| Linux Kernel | =3.2-rc5 | |
| Linux Kernel | =3.2-rc6 | |
| Linux Kernel | =3.2-rc7 | |
| Linux Kernel | =3.2.1 | |
| Linux Kernel | =3.2.2 | |
| Linux Kernel | =3.2.3 | |
| Linux Kernel | =3.2.4 | |
| Linux Kernel | =3.2.5 | |
| Linux Kernel | =3.2.6 | |
| Linux Kernel | =3.2.7 | |
| Linux Kernel | =3.2.8 | |
| Linux Kernel | =3.2.9 | |
| Linux Kernel | =3.2.10 | |
| Linux Kernel | =3.2.11 | |
| Linux Kernel | =3.2.12 | |
| Linux Kernel | =3.2.13 | |
| Linux Kernel | =3.2.14 | |
| Linux Kernel | =3.2.15 | |
| Linux Kernel | =3.2.16 | |
| Linux Kernel | =3.2.17 | |
| Linux Kernel | =3.2.18 | |
| Linux Kernel | =3.2.19 | |
| Linux Kernel | =3.2.20 | |
| <=3.3 | ||
| =3.0-rc1 | ||
| =3.0-rc2 | ||
| =3.0-rc3 | ||
| =3.0-rc4 | ||
| =3.0-rc5 | ||
| =3.0-rc6 | ||
| =3.0-rc7 | ||
| =3.0.1 | ||
| =3.0.2 | ||
| =3.0.3 | ||
| =3.0.4 | ||
| =3.0.5 | ||
| =3.0.6 | ||
| =3.0.7 | ||
| =3.0.8 | ||
| =3.0.9 | ||
| =3.0.10 | ||
| =3.0.11 | ||
| =3.0.12 | ||
| =3.0.13 | ||
| =3.0.14 | ||
| =3.0.15 | ||
| =3.0.16 | ||
| =3.0.17 | ||
| =3.0.18 | ||
| =3.0.19 | ||
| =3.0.20 | ||
| =3.0.21 | ||
| =3.0.22 | ||
| =3.0.23 | ||
| =3.0.24 | ||
| =3.0.25 | ||
| =3.0.26 | ||
| =3.0.27 | ||
| =3.0.28 | ||
| =3.0.29 | ||
| =3.0.30 | ||
| =3.0.31 | ||
| =3.0.32 | ||
| =3.0.33 | ||
| =3.0.34 | ||
| =3.1 | ||
| =3.1-rc1 | ||
| =3.1-rc2 | ||
| =3.1-rc3 | ||
| =3.1-rc4 | ||
| =3.1.1 | ||
| =3.1.2 | ||
| =3.1.3 | ||
| =3.1.4 | ||
| =3.1.5 | ||
| =3.1.6 | ||
| =3.1.7 | ||
| =3.1.8 | ||
| =3.1.9 | ||
| =3.1.10 | ||
| =3.2 | ||
| =3.2-rc2 | ||
| =3.2-rc3 | ||
| =3.2-rc4 | ||
| =3.2-rc5 | ||
| =3.2-rc6 | ||
| =3.2-rc7 | ||
| =3.2.1 | ||
| =3.2.2 | ||
| =3.2.3 | ||
| =3.2.4 | ||
| =3.2.5 | ||
| =3.2.6 | ||
| =3.2.7 | ||
| =3.2.8 | ||
| =3.2.9 | ||
| =3.2.10 | ||
| =3.2.11 | ||
| =3.2.12 | ||
| =3.2.13 | ||
| =3.2.14 | ||
| =3.2.15 | ||
| =3.2.16 | ||
| =3.2.17 | ||
| =3.2.18 | ||
| =3.2.19 | ||
| =3.2.20 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.3.1
- https://bugzilla.redhat.com/show_bug.cgi?id=749143
- https://github.com/torvalds/linux/commit/15291164b22a357cb211b618adfef4fa82fc0de3
- http://secunia.com/advisories/48898
- http://secunia.com/advisories/48964
- http://www.debian.org/security/2012/dsa-2469
- http://rhn.redhat.com/errata/RHSA-2012-0670.html
- http://rhn.redhat.com/errata/RHSA-2012-0571.html
- http://lists.opensuse.org/opensuse-security-announce/2012-05/msg00013.html
- http://lists.opensuse.org/opensuse-security-announce/2012-04/msg00021.html
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=15291164b22a357cb211b618adfef4fa82fc0de3
- https://launchpad.net/bugs/cve/CVE-2011-4086
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=560073
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=560073&action=edit
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=788260
- http://thread.gmane.org/gmane.comp.file-systems.ext4/30623
- https://rhn.redhat.com/errata/RHSA-2012-0107.html
- https://rhn.redhat.com/errata/RHSA-2012-0571.html
- https://rhn.redhat.com/errata/RHSA-2012-0670.html
- https://access.redhat.com/support/policy/updates/errata/
- https://security-tracker.debian.org/tracker/CVE-2011-4086
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-4086
- https://nvd.nist.gov/vuln/detail/CVE-2011-4086
- https://ubuntu.com/security/CVE-2011-4086
Frequently Asked Questions
What is the severity of CVE-2011-4086?
CVE-2011-4086 is classified as a medium severity vulnerability affecting the Linux kernel.
How do I fix CVE-2011-4086?
To fix CVE-2011-4086, update the Linux kernel to version 3.3.1 or later.
What systems are affected by CVE-2011-4086?
CVE-2011-4086 affects various versions of the Linux kernel, up to and including 3.3.
What is the impact of CVE-2011-4086?
The impact of CVE-2011-4086 includes potential data corruption in specific scenarios related to buffer management.
When was CVE-2011-4086 disclosed?
CVE-2011-4086 was disclosed in 2011 as part of a batch of vulnerabilities affecting the Linux kernel.
- agent/type
- agent/first-publish-date
- collector/launchpad-cve
- source/Launchpad
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2011-4086
- agent/author
- collector/security-tracker-debian
- source/Debian
- agent/software-canonical-lookup
- agent/weakness
- agent/severity
- collector/mitre-cve
- source/MITRE
- collector/usn-cve
- source/Ubuntu
- agent/references
- agent/remedy
- agent/softwarecombine
- agent/description
- agent/event
- agent/last-modified-date
- agent/trending
- agent/source
- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- collector/nvd-cve
- source/NVD
- collector/nvd-historical
- package-manager/debian
- vendor/linux
- canonical/linux kernel
- version/linux kernel/3.3
- version/linux kernel/3.0-rc1
- version/linux kernel/3.0-rc2
- version/linux kernel/3.0-rc3
- version/linux kernel/3.0-rc4
- version/linux kernel/3.0-rc5
- version/linux kernel/3.0-rc6
- version/linux kernel/3.0-rc7
- version/linux kernel/3.0.1
- version/linux kernel/3.0.2
- version/linux kernel/3.0.3
- version/linux kernel/3.0.4
- version/linux kernel/3.0.5
- version/linux kernel/3.0.6
- version/linux kernel/3.0.7
- version/linux kernel/3.0.8
- version/linux kernel/3.0.9
- version/linux kernel/3.0.10
- version/linux kernel/3.0.11
- version/linux kernel/3.0.12
- version/linux kernel/3.0.13
- version/linux kernel/3.0.14
- version/linux kernel/3.0.15
- version/linux kernel/3.0.16
- version/linux kernel/3.0.17
- version/linux kernel/3.0.18
- version/linux kernel/3.0.19
- version/linux kernel/3.0.20
- version/linux kernel/3.0.21
- version/linux kernel/3.0.22
- version/linux kernel/3.0.23
- version/linux kernel/3.0.24
- version/linux kernel/3.0.25
- version/linux kernel/3.0.26
- version/linux kernel/3.0.27
- version/linux kernel/3.0.28
- version/linux kernel/3.0.29
- version/linux kernel/3.0.30
- version/linux kernel/3.0.31
- version/linux kernel/3.0.32
- version/linux kernel/3.0.33
- version/linux kernel/3.0.34
- version/linux kernel/3.1
- version/linux kernel/3.1-rc1
- version/linux kernel/3.1-rc2
- version/linux kernel/3.1-rc3
- version/linux kernel/3.1-rc4
- version/linux kernel/3.1.1
- version/linux kernel/3.1.2
- version/linux kernel/3.1.3
- version/linux kernel/3.1.4
- version/linux kernel/3.1.5
- version/linux kernel/3.1.6
- version/linux kernel/3.1.7
- version/linux kernel/3.1.8
- version/linux kernel/3.1.9
- version/linux kernel/3.1.10
- version/linux kernel/3.2
- version/linux kernel/3.2-rc2
- version/linux kernel/3.2-rc3
- version/linux kernel/3.2-rc4
- version/linux kernel/3.2-rc5
- version/linux kernel/3.2-rc6
- version/linux kernel/3.2-rc7
- version/linux kernel/3.2.1
- version/linux kernel/3.2.2
- version/linux kernel/3.2.3
- version/linux kernel/3.2.4
- version/linux kernel/3.2.5
- version/linux kernel/3.2.6
- version/linux kernel/3.2.7
- version/linux kernel/3.2.8
- version/linux kernel/3.2.9
- version/linux kernel/3.2.10
- version/linux kernel/3.2.11
- version/linux kernel/3.2.12
- version/linux kernel/3.2.13
- version/linux kernel/3.2.14
- version/linux kernel/3.2.15
- version/linux kernel/3.2.16
- version/linux kernel/3.2.17
- version/linux kernel/3.2.18
- version/linux kernel/3.2.19
- version/linux kernel/3.2.20