CVE-2018-14734: Use After Free
First published: Sun Jul 29 2018(Updated: )
A flaw was found in Linux Kernel in the ucma_leave_multicast() function in drivers/infiniband/core/ucma.c which allows to access a certain data structure after freeing it in ucma_process_join(). This allows an attacker to cause use-after-free bug and to induce kernel memory corruption, leading to a system crash or other unspecified impact. References: <a href="https://marc.info/?t=152787806300002&r=1&w=2">https://marc.info/?t=152787806300002&r=1&w=2</a> <a href="https://patchwork.kernel.org/patch/10444267/">https://patchwork.kernel.org/patch/10444267/</a> An upstream patch: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cb2595c1393b4a5211534e6f0a0fbad369e21ad8">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cb2595c1393b4a5211534e6f0a0fbad369e21ad8</a>
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <4.18 | 4.18 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.16-1 | |
| Linux kernel | <=4.17.11 | |
| Ubuntu | =12.04 | |
| Ubuntu | =14.04 | |
| Ubuntu | =16.04 | |
| Ubuntu | =18.04 | |
| Debian | =8.0 | |
| Debian | =9.0 |
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Reference Links
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cb2595c1393b4a5211534e6f0a0fbad369e21ad8
- https://access.redhat.com/errata/RHSA-2019:0831
- https://access.redhat.com/errata/RHSA-2019:2029
- https://access.redhat.com/errata/RHSA-2019:2043
- https://github.com/torvalds/linux/commit/cb2595c1393b4a5211534e6f0a0fbad369e21ad8
- https://lists.debian.org/debian-lts-announce/2018/10/msg00003.html
- https://usn.ubuntu.com/3797-1/
- https://usn.ubuntu.com/3797-2/
- https://usn.ubuntu.com/3847-1/
- https://usn.ubuntu.com/3847-2/
- https://usn.ubuntu.com/3847-3/
- https://usn.ubuntu.com/3849-1/
- https://usn.ubuntu.com/3849-2/
- https://www.debian.org/security/2018/dsa-4308
- https://launchpad.net/bugs/cve/CVE-2018-14734
- https://marc.info/?t=152787806300002&r=1&w=2
- https://patchwork.kernel.org/patch/10444267/
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cb2595c1393b4a5211534e6f0a0fbad369e21ad8
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1611007
- https://bugzilla.redhat.com/show_bug.cgi?id=1611005
- https://git.kernel.org/linus/cb2595c1393b4a5211534e6f0a0fbad369e21ad8
- https://security-tracker.debian.org/tracker/CVE-2018-14734
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14734
- https://nvd.nist.gov/vuln/detail/CVE-2018-14734
- https://ubuntu.com/security/CVE-2018-14734
Frequently Asked Questions
What is the severity of CVE-2018-14734?
CVE-2018-14734 is classified as a high severity vulnerability due to its potential to cause kernel memory corruption.
How do I fix CVE-2018-14734?
To fix CVE-2018-14734, update the Linux kernel to one of the patched versions specified by your distribution.
Which Linux distributions are affected by CVE-2018-14734?
CVE-2018-14734 affects multiple distributions including Red Hat, Debian, and Ubuntu.
What kind of vulnerability is CVE-2018-14734?
CVE-2018-14734 is a use-after-free vulnerability that allows attackers to access freed memory, potentially leading to system crashes or arbitrary code execution.
Is CVE-2018-14734 exploitable remotely?
Yes, CVE-2018-14734 can potentially be exploited remotely under certain conditions, allowing an attacker to affect the kernel.
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