CVE-2018-13093: Null Pointer Dereference
First published: Thu Apr 12 2018(Updated: )
An issue was discovered in fs/xfs/xfs_icache.c in the Linux kernel through 4.17.3. There is a NULL pointer dereference and panic in lookup_slow() on a NULL inode->i_ops pointer when doing pathwalks on a corrupted xfs image. This occurs because of a lack of proper validation that cached inodes are free during allocation.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:3.10.0-1062.rt56.1022.el7 | 0:3.10.0-1062.rt56.1022.el7 |
| redhat/kernel | <0:3.10.0-1062.el7 | 0:3.10.0-1062.el7 |
| redhat/kernel | <4.18 | 4.18 |
| Linux Kernel | <=4.17.3 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.133-1 6.12.21-1 6.12.22-1 |
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2018-13093 https://nvd.nist.gov/vuln/detail/CVE-2018-13093
- https://bugzilla.redhat.com/show_bug.cgi?id=1597766
- https://access.redhat.com/errata/RHSA-2019:2043
- https://access.redhat.com/errata/RHSA-2019:2029
- https://access.redhat.com/security/cve/cve-2018-13093
- https://bugzilla.kernel.org/show_bug.cgi?id=199367
- https://git.kernel.org/pub/scm/fs/xfs/xfs-linux.git/commit/?h=for-next&id=afca6c5b2595fc44383919fba740c194b0b76aff
- https://github.com/torvalds/linux/commit/afca6c5b2595fc44383919fba740c194b0b76aff
- https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html
- https://usn.ubuntu.com/4094-1/
- https://usn.ubuntu.com/4118-1/
- https://git.kernel.org/pub/scm/fs/xfs/xfs-linux.git/commit/?h=for-next&id=afca6c5b2595fc44383919fba740c194b0b76aff
- https://launchpad.net/bugs/cve/CVE-2018-13093
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=afca6c5b2595fc44383919fba740c194b0b76aff
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ee457001ed6c
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1597767
- https://lwn.net/Articles/652468/
- https://security-tracker.debian.org/tracker/CVE-2018-13093
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-13093
- https://nvd.nist.gov/vuln/detail/CVE-2018-13093
- https://ubuntu.com/security/CVE-2018-13093
Frequently Asked Questions
What is the severity of CVE-2018-13093?
CVE-2018-13093 has a high severity rating due to the potential for denial of service through a NULL pointer dereference.
How do I fix CVE-2018-13093?
To fix CVE-2018-13093, update the kernel to version 0:3.10.0-1062.rt56.1022.el7 or later for the affected Red Hat packages.
What versions of the Linux kernel are affected by CVE-2018-13093?
CVE-2018-13093 affects the Linux kernel versions up to 4.17.3.
Can CVE-2018-13093 be exploited remotely?
CVE-2018-13093 can potentially be exploited remotely if an attacker interacts with a corrupted xfs image.
What happens if CVE-2018-13093 is successfully exploited?
If CVE-2018-13093 is successfully exploited, it could lead to a system panic and result in a denial of service.
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