CVE-2017-12190
First published: Mon Sep 25 2017(Updated: )
bio_map_user_iov and bio_unmap_user do unbalanced pages refcounting if IO vector has small consecutive buffers belonging to the same page. bio_add_pc_page merges them into one, but the page reference is never dropped, causing memory leak. References: <a href="http://seclists.org/oss-sec/2017/q4/52">http://seclists.org/oss-sec/2017/q4/52</a> <a href="https://bugzilla.suse.com/show_bug.cgi?id=1062568">https://bugzilla.suse.com/show_bug.cgi?id=1062568</a> Discussion: <a href="https://marc.info/?t=150605752800001&r=1&w=2">https://marc.info/?t=150605752800001&r=1&w=2</a> Proposed patch and reproducer: <a href="https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1495884.html">https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1495884.html</a> <a href="https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1495887.html">https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1495887.html</a> Related upstream commits: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=95d78c28b5a85bacbc29b8dba7c04babb9b0d467">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=95d78c28b5a85bacbc29b8dba7c04babb9b0d467</a> <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2b04e8f6bbb196cab4b232af0f8d48ff2c7a8058">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2b04e8f6bbb196cab4b232af0f8d48ff2c7a8058</a>
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | <=4.13.7 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.17-1 |
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Reference Links
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2b04e8f6bbb196cab4b232af0f8d48ff2c7a8058
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=95d78c28b5a85bacbc29b8dba7c04babb9b0d467
- http://seclists.org/oss-sec/2017/q4/52
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.8
- http://www.securityfocus.com/bid/101911
- https://access.redhat.com/errata/RHSA-2018:0654
- https://access.redhat.com/errata/RHSA-2018:0676
- https://access.redhat.com/errata/RHSA-2018:1062
- https://access.redhat.com/errata/RHSA-2018:1854
- https://access.redhat.com/errata/RHSA-2019:1170
- https://access.redhat.com/errata/RHSA-2019:1190
- https://bugzilla.redhat.com/show_bug.cgi?id=1495089
- https://github.com/torvalds/linux/commit/2b04e8f6bbb196cab4b232af0f8d48ff2c7a8058
- https://github.com/torvalds/linux/commit/95d78c28b5a85bacbc29b8dba7c04babb9b0d467
- https://lists.debian.org/debian-lts-announce/2017/12/msg00004.html
- https://support.f5.com/csp/article/K93472064?utm_source=f5support&%3Butm_medium=RSS
- https://usn.ubuntu.com/3582-1/
- https://usn.ubuntu.com/3582-2/
- https://usn.ubuntu.com/3583-1/
- https://usn.ubuntu.com/3583-2/
- https://support.f5.com/csp/article/K93472064?utm_source=f5support&amp%3Butm_medium=RSS
- https://launchpad.net/bugs/cve/CVE-2017-12190
- https://bugzilla.suse.com/show_bug.cgi?id=1062568
- https://marc.info/?t=150605752800001&r=1&w=2
- https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1495884.html
- https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1495887.html
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=95d78c28b5a85bacbc29b8dba7c04babb9b0d467
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2b04e8f6bbb196cab4b232af0f8d48ff2c7a8058
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1503580
- https://access.redhat.com/support/policy/updates/errata/
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-12190
- https://nvd.nist.gov/vuln/detail/CVE-2017-12190
- https://security-tracker.debian.org/tracker/CVE-2017-12190
- https://ubuntu.com/security/CVE-2017-12190
Frequently Asked Questions
What is CVE-2017-12190?
CVE-2017-12190 is a vulnerability in the Linux kernel that allows for unbalanced refcounting when a SCSI I/O vector has small consecutive buffers belonging to the same page.
How does CVE-2017-12190 affect Linux?
CVE-2017-12190 affects the Linux kernel versions before 4.13.8 and can result in a kernel crash or privilege escalation.
What is the severity of CVE-2017-12190?
CVE-2017-12190 has a severity rating of medium.
How can I fix CVE-2017-12190?
To fix CVE-2017-12190, you need to update your Linux kernel to version 4.13.8 or later.
Where can I find more information about CVE-2017-12190?
You can find more information about CVE-2017-12190 at the following references: [1] [2] [3].
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