CVE-2021-27365: Buffer Overflow
First published: Thu Feb 18 2021(Updated: )
A flaw was found in the Linux kernel. A heap buffer overflow in the iSCSI subsystem is triggered by setting an iSCSI string attribute to a value larger than one page and then trying to read it. The highest threat from this vulnerability is to data confidentiality and integrity 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 |
| Linux Kernel | <=5.11.3 | |
| Debian Linux | =9.0 | |
| Oracle Tekelec Platform Distribution | >=7.4.0<=7.7.1 | |
| All of | ||
| NetApp SolidFire Baseboard Management Controller Firmware | ||
| NetApp SolidFire | ||
| NetApp SolidFire Baseboard Management Controller Firmware | ||
| NetApp SolidFire | ||
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.128-1 6.12.20-1 6.12.21-1 |
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-2021-27365 https://nvd.nist.gov/vuln/detail/CVE-2021-27365 https://www.openwall.com/lists/oss-security/2021/03/06/1
- https://bugzilla.redhat.com/show_bug.cgi?id=1930078
- 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-2021-27365
- https://bugzilla.suse.com/show_bug.cgi?id=1182715
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ec98ea7070e94cc25a422ec97d1421e28d97b7ee
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f9dbdf97a5bd92b1a49cee3d591b55b11fd7a6d5
- 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-2021-27365
- https://access.redhat.com/solutions/41278
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1935902
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1939429
- https://git.kernel.org/linus/ec98ea7070e94cc25a422ec97d1421e28d97b7ee
- https://git.kernel.org/linus/f9dbdf97a5bd92b1a49cee3d591b55b11fd7a6d5
- https://security-tracker.debian.org/tracker/CVE-2021-27365
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27365
- https://nvd.nist.gov/vuln/detail/CVE-2021-27365
- https://ubuntu.com/security/CVE-2021-27365
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is the severity of CVE-2021-27365?
CVE-2021-27365 has a high severity due to its potential impact on data confidentiality and integrity.
How do I fix CVE-2021-27365?
To fix CVE-2021-27365, upgrade your kernel to the latest available version provided by your distribution.
What are the affected operating systems for CVE-2021-27365?
CVE-2021-27365 affects various versions of the Linux kernel across Red Hat, Debian, and Oracle systems.
What types of systems are primarily impacted by CVE-2021-27365?
CVE-2021-27365 primarily impacts systems using the iSCSI subsystem in the Linux kernel.
Is CVE-2021-27365 exploitable remotely?
Yes, CVE-2021-27365 can potentially be exploited remotely if the iSCSI service is exposed.
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