CVE-2011-2479
First published: Mon Jun 20 2011(Updated: )
Description of problem: The huge_memory.c THP page fault was allowed to run if vm_ops was null (which would succeed for /dev/zero MAP_PRIVATE, as the f_op->mmap wouldn't setup a special vma->vm_ops and it would fallback to regular anonymous memory) but other THP logics weren't fully activated for vmas with vm_file not NULL (/dev/zero has a not NULL vma->vm_file). Unprivileged local user could use this flaw to crash the server. Upstream patch: 78f11a255749d09025f54d4e2df4fbcb031530e2 References: <a href="https://bugzilla.kernel.org/show_bug.cgi?id=33682">https://bugzilla.kernel.org/show_bug.cgi?id=33682</a> <a href="http://www.spinics.net/lists/stable-commits/msg11762.html">http://www.spinics.net/lists/stable-commits/msg11762.html</a>
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux-2.6 | ||
| Linux kernel | <2.6.39 | |
| Linux Kernel | <2.6.39 |
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Reference Links
- https://github.com/torvalds/linux/commit/78f11a255749d09025f54d4e2df4fbcb031530e2
- http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39
- http://www.openwall.com/lists/oss-security/2011/06/20/14
- https://bugzilla.redhat.com/show_bug.cgi?id=714761
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=78f11a255749d09025f54d4e2df4fbcb031530e2
- https://launchpad.net/bugs/cve/CVE-2011-2479
- https://bugzilla.kernel.org/show_bug.cgi?id=33682
- http://www.spinics.net/lists/stable-commits/msg11762.html
- https://rhn.redhat.com/errata/RHSA-2011-0928.html
- http://seclists.org/oss-sec/2011/q2/644
- https://security-tracker.debian.org/tracker/CVE-2011-2479
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-2479
- https://nvd.nist.gov/vuln/detail/CVE-2011-2479
- https://ubuntu.com/security/CVE-2011-2479
Frequently Asked Questions
What is the severity of CVE-2011-2479?
CVE-2011-2479 is classified as a medium severity vulnerability affecting the Linux kernel.
How do I fix CVE-2011-2479?
To address CVE-2011-2479, upgrade the Linux kernel to version 2.6.39 or later.
What systems are affected by CVE-2011-2479?
CVE-2011-2479 affects Linux kernel versions prior to 2.6.39, particularly in Debian-based systems.
What types of attacks can exploit CVE-2011-2479?
CVE-2011-2479 can be exploited through specially crafted user memory operations allowing unauthorized access.
When was CVE-2011-2479 discovered?
CVE-2011-2479 was reported in June 2011 during security assessments of the Linux kernel.
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