CVE-2021-27364: Infoleak
First published: Thu Feb 18 2021(Updated: )
A flaw was found in the Linux kernel. An out-of-bounds read was discovered in the libiscsi module that could lead to reading kernel memory or a crash. The highest threat from this vulnerability is to data confidentiality as well as system availability.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <0:2.6.32-754.39.1.el6 | 0:2.6.32-754.39.1.el6 |
| redhat/kernel-rt | <0:3.10.0-1160.24.1.rt56.1161.el7 | 0:3.10.0-1160.24.1.rt56.1161.el7 |
| redhat/kernel | <0:3.10.0-1160.24.1.el7 | 0:3.10.0-1160.24.1.el7 |
| redhat/kernel-alt | <0:4.14.0-115.36.1.el7a | 0:4.14.0-115.36.1.el7a |
| redhat/kernel | <0:3.10.0-327.96.1.el7 | 0:3.10.0-327.96.1.el7 |
| redhat/kernel | <0:3.10.0-514.88.1.el7 | 0:3.10.0-514.88.1.el7 |
| redhat/kernel | <0:3.10.0-693.84.1.el7 | 0:3.10.0-693.84.1.el7 |
| redhat/kernel | <0:3.10.0-957.72.1.el7 | 0:3.10.0-957.72.1.el7 |
| redhat/kernel | <0:3.10.0-1062.49.1.el7 | 0:3.10.0-1062.49.1.el7 |
| redhat/kernel-rt | <0:4.18.0-240.22.1.rt7.77.el8_3 | 0:4.18.0-240.22.1.rt7.77.el8_3 |
| redhat/kernel | <0:4.18.0-240.22.1.el8_3 | 0:4.18.0-240.22.1.el8_3 |
| redhat/kernel | <0:4.18.0-147.44.1.el8_1 | 0:4.18.0-147.44.1.el8_1 |
| redhat/kernel-rt | <0:4.18.0-193.51.1.rt13.101.el8_2 | 0:4.18.0-193.51.1.rt13.101.el8_2 |
| redhat/kernel | <0:4.18.0-193.51.1.el8_2 | 0:4.18.0-193.51.1.el8_2 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.13-1 | |
| Linux Kernel | <=5.11.3 | |
| Debian | =9.0 | |
| All of | ||
| netapp solidfire baseboard management controller firmware | ||
| netapp solidfire baseboard management controller | ||
| Oracle Tekelec Platform Distribution | >=7.4.0<=7.7.1 | |
| Ubuntu | =14.04 | |
| Ubuntu | =16.04 | |
| Ubuntu | =18.04 | |
| Ubuntu | =20.04 | |
| netapp solidfire baseboard management controller firmware | ||
| netapp solidfire baseboard management controller |
Remedy
The LIBISCSI module will be auto-loaded when required, its use can be disabled by preventing the module from loading with the following instructions: # echo "install libiscsi /bin/true" >> /etc/modprobe.d/disable-libiscsi.conf The system will need to be restarted if the libiscsi modules are loaded. In most circumstances, the libiscsi kernel modules will be unable to be unloaded while any network interfaces are active and the protocol is in use. If the system requires iscsi to work correctly, this mitigation may not be suitable. If you need further assistance, see KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Services.
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2021-27364 https://nvd.nist.gov/vuln/detail/CVE-2021-27364
- https://bugzilla.redhat.com/show_bug.cgi?id=1930080
- https://access.redhat.com/errata/RHSA-2021:1288
- https://access.redhat.com/errata/RHSA-2021:1070
- https://access.redhat.com/errata/RHSA-2021:1069
- https://access.redhat.com/errata/RHSA-2021:1071
- https://access.redhat.com/errata/RHSA-2021:1379
- https://access.redhat.com/errata/RHSA-2021:1289
- https://access.redhat.com/errata/RHSA-2021:1373
- https://access.redhat.com/errata/RHSA-2021:1267
- https://access.redhat.com/errata/RHSA-2021:1376
- https://access.redhat.com/errata/RHSA-2021:1377
- https://access.redhat.com/errata/RHSA-2021:1531
- https://access.redhat.com/errata/RHSA-2021:1532
- https://access.redhat.com/errata/RHSA-2021:1081
- https://access.redhat.com/errata/RHSA-2021:1093
- https://access.redhat.com/errata/RHSA-2021:1171
- https://access.redhat.com/errata/RHSA-2021:1173
- https://access.redhat.com/errata/RHSA-2021:1279
- https://access.redhat.com/errata/RHSA-2021:1272
- https://access.redhat.com/errata/RHSA-2021:1295
- https://access.redhat.com/security/cve/cve-2021-27364
- https://bugzilla.suse.com/show_bug.cgi?id=1182717
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=688e8128b7a92df982709a4137ea4588d16f24aa
- https://www.openwall.com/lists/oss-security/2021/03/06/1
- https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
- https://blog.grimm-co.com/2021/03/new-old-bugs-in-linux-kernel.html
- https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
- http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html
- https://security.netapp.com/advisory/ntap-20210409-0001/
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://launchpad.net/bugs/cve/CVE-2021-27364
- https://access.redhat.com/solutions/41278
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f9dbdf97a5bd92b1a49cee3d591b55b11fd7a6d5
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1935907
- https://git.kernel.org/linus/688e8128b7a92df982709a4137ea4588d16f24aa
- https://security-tracker.debian.org/tracker/CVE-2021-27364
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27364
- https://nvd.nist.gov/vuln/detail/CVE-2021-27364
- https://ubuntu.com/security/CVE-2021-27364
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is the severity of CVE-2021-27364?
The severity of CVE-2021-27364 is high, impacting data confidentiality and system availability.
How do I fix CVE-2021-27364?
To fix CVE-2021-27364, update the Linux kernel to the specified remedied versions provided by your distribution.
Which Linux kernel versions are affected by CVE-2021-27364?
CVE-2021-27364 affects multiple Linux kernel versions, notably those prior to the remedied versions listed in the security advisories.
What systems are vulnerable to CVE-2021-27364?
Systems running affected versions of the Linux kernel, including specific releases from Red Hat and Debian, are vulnerable to CVE-2021-27364.
What type of vulnerability is CVE-2021-27364?
CVE-2021-27364 is an out-of-bounds read vulnerability in the Linux kernel that can lead to unauthorized data access or crashes.
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