CVE-2010-3080: Double Free
First published: Mon Sep 06 2010(Updated: )
Description of problem: There is a bug in snd_seq_oss_open from sound/core/seq/oss/seq_oss_init.c. So here's the error path for some setup failure: _error: snd_seq_oss_writeq_delete(dp->writeq); snd_seq_oss_readq_delete(dp->readq); snd_seq_oss_synth_cleanup(dp); snd_seq_oss_midi_cleanup(dp); delete_port(dp); delete_seq_queue(dp->queue); kfree(dp); This looks okay, but actually, delete_port calls port_delete (eventually... this code is tough to follow) which does a free_devinfo on the owner struct seq_oss_devinfo, here (around ~269 in seq_ports.c): if (port->private_free) port->private_free(port->private_data); because of this (around ~334 in seq_oss_init.c): memset(&callback, 0, sizeof(callback)); callback.owner = THIS_MODULE; callback.private_data = dp; callback.event_input = snd_seq_oss_event_input; callback.private_free = free_devinfo; port.kernel = &callback; Which does this: static void free_devinfo(void *private) { struct seq_oss_devinfo *dp = (struct seq_oss_devinfo *)private; if (dp->timer) snd_seq_oss_timer_delete(dp->timer); if (dp->writeq) snd_seq_oss_writeq_delete(dp->writeq); if (dp->readq) snd_seq_oss_readq_delete(dp->readq); kfree(dp); } So..... delete_port(dp); delete_seq_queue(dp->queue); <= Oops, dereferencing released pointer. kfree(dp); <= Oops, double free. Acknowledgements: Red Hat would like to thank Tavis Ormandy for reporting this issue.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux-2.6 | ||
| Linux Kernel | <2.6.36 | |
| Linux Kernel | =2.6.36 | |
| Linux Kernel | =2.6.36-rc1 | |
| Linux Kernel | =2.6.36-rc2 | |
| Linux Kernel | =2.6.36-rc3 | |
| SUSE Linux | =11.1 | |
| SUSE Linux Enterprise Desktop | =11-sp1 | |
| SUSE Linux Enterprise Real Time Extension | =11-sp1 | |
| SUSE Linux Enterprise Server | =11-sp1 | |
| Ubuntu | =6.06 | |
| Ubuntu | =8.04 | |
| Ubuntu | =9.04 | |
| Ubuntu | =9.10 | |
| Ubuntu | =10.04 | |
| Ubuntu | =10.10 |
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Reference Links
- http://secunia.com/advisories/42890
- http://www.securityfocus.com/bid/43062
- http://www.vupen.com/english/advisories/2011/0298
- http://www.mandriva.com/security/advisories?name=MDVSA-2010:198
- https://bugzilla.redhat.com/show_bug.cgi?id=630551
- http://www.redhat.com/support/errata/RHSA-2011-0007.html
- http://lists.opensuse.org/opensuse-security-announce/2010-10/msg00003.html
- http://lists.opensuse.org/opensuse-security-announce/2010-11/msg00000.html
- http://lists.opensuse.org/opensuse-security-announce/2011-02/msg00000.html
- http://www.ubuntu.com/usn/USN-1000-1
- http://www.openwall.com/lists/oss-security/2010/09/08/7
- http://git.kernel.org/?p=linux/kernel/git/tiwai/sound-2.6.git%3Ba=commit%3Bh=c598337660c21c0afaa9df5a65bb4a7a0cf15be8
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=27f7ad53829f79e799a253285318bff79ece15bd
- http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.36-rc4
- https://launchpad.net/bugs/cve/CVE-2010-3080
- http://git.kernel.org/?p=linux/kernel/git/tiwai/sound-2.6.git;a=commitdiff;h=c598337660c21c0afaa9df5a65bb4a7a0cf15be8
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff_plain;h=27f7ad53829f79e799a253285318bff79ece15bd
- https://rhn.redhat.com/errata/RHSA-2011-0007.html
- https://security-tracker.debian.org/tracker/CVE-2010-3080
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3080
- https://nvd.nist.gov/vuln/detail/CVE-2010-3080
- https://ubuntu.com/security/CVE-2010-3080
Frequently Asked Questions
What is the severity of CVE-2010-3080?
CVE-2010-3080 is considered to have a moderate severity level.
How do I fix CVE-2010-3080?
To fix CVE-2010-3080, upgrade to a version of the Linux kernel that is higher than 2.6.36.
What systems are affected by CVE-2010-3080?
CVE-2010-3080 affects Linux kernel versions up to 2.6.36 and various distributions including Debian, openSUSE, and Ubuntu.
What type of vulnerability is CVE-2010-3080?
CVE-2010-3080 is a bug in the snd_seq_oss_open function within the sound subsystem of the Linux kernel.
Can CVE-2010-3080 lead to system compromise?
Yes, CVE-2010-3080 can potentially lead to denial of service or other issues due to improper error handling.
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