CVE-2015-8785
First published: Fri Dec 11 2015(Updated: )
A patch was posted to fix an issue regarding unkillable task eating CPU. The problem is in the fuse_fill_write_pages() function. When a user calls the sys_writev syscall with specially crafted sequence of iovs the kernel function may never terminate and continue in a tight loop, the process is unable to be killed. Introduced in commit ea9b9907b82a09bd1a708004454f7065de77c5b0 Fixed in commit 3ca8138f014a913f98e6ef40e939868e1e9ea876 Upstream patch: <a href="https://lkml.org/lkml/2015/10/12/329">https://lkml.org/lkml/2015/10/12/329</a>
Credit: security@debian.org security@debian.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <4.4 | |
| Linux Linux kernel | =4.4-rc1 | |
| Linux Linux kernel | =4.4-rc2 | |
| Linux Linux kernel | =4.4-rc3 | |
| Linux Linux kernel | =4.4-rc4 | |
| Suse Linux Enterprise Real Time Extension | =12-sp1 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.112-1 6.11.5-1 6.11.7-1 |
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Reference Links
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3ca8138f014a913f98e6ef40e939868e1e9ea876
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00015.html
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html
- http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00005.html
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html
- http://www.debian.org/security/2016/dsa-3503
- http://www.openwall.com/lists/oss-security/2016/01/24/1
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
- http://www.oracle.com/technetwork/topics/security/ovmbulletinoct2016-3090547.html
- http://www.securityfocus.com/bid/81688
- http://www.ubuntu.com/usn/USN-2886-1
- https://bugzilla.redhat.com/show_bug.cgi?id=1290642
- https://github.com/torvalds/linux/commit/3ca8138f014a913f98e6ef40e939868e1e9ea876
- https://launchpad.net/bugs/cve/CVE-2015-8785
- https://lkml.org/lkml/2015/10/12/329
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3ca8138f014a913f98e6ef40e939868e1e9ea876
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ea9b9907b82a09bd1a708004454f7065de77c5b0
- https://www.openwall.com/lists/oss-security/2016/01/24/1
- https://security-tracker.debian.org/tracker/CVE-2015-8785
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8785
- https://nvd.nist.gov/vuln/detail/CVE-2015-8785
- https://ubuntu.com/security/CVE-2015-8785
Frequently Asked Questions
What is the vulnerability ID for this vulnerability?
The vulnerability ID is CVE-2015-8785.
What is the severity level of CVE-2015-8785?
The severity level of CVE-2015-8785 is low.
How does CVE-2015-8785 affect the Linux kernel?
CVE-2015-8785 allows local users to cause a denial of service (infinite loop) via a writev system call that triggers a zero length for the first segment of an iov.
Which versions of the Linux kernel are affected by CVE-2015-8785?
The Linux kernel versions before 4.4 are affected by CVE-2015-8785.
How can I fix CVE-2015-8785?
To fix CVE-2015-8785, update your Linux kernel version to 4.4 or later.
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