Information Exposure Affecting kernel-rt-debug-modules-extra package, versions <0:4.18.0-240.22.1.rt7.77.el8_3
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Test your applications- Snyk ID SNYK-CENTOS8-KERNELRTDEBUGMODULESEXTRA-2092257
- published 26 Jul 2021
- disclosed 5 Mar 2021
Introduced: 5 Mar 2021
CVE-2021-27363 Open this link in a new tabHow to fix?
Upgrade Centos:8 kernel-rt-debug-modules-extra to version 0:4.18.0-240.22.1.rt7.77.el8_3 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-modules-extra package and not the kernel-rt-debug-modules-extra package as distributed by Centos.
See How to fix? for Centos:8 relevant fixed versions and status.
An issue was discovered in the Linux kernel through 5.11.3. A kernel pointer leak can be used to determine the address of the iscsi_transport structure. When an iSCSI transport is registered with the iSCSI subsystem, the transport's handle is available to unprivileged users via the sysfs file system, at /sys/class/iscsi_transport/$TRANSPORT_NAME/handle. When read, the show_transport_handle function (in drivers/scsi/scsi_transport_iscsi.c) is called, which leaks the handle. This handle is actually the pointer to an iscsi_transport struct in the kernel module's global variables.
References
- https://security.netapp.com/advisory/ntap-20210409-0001/
- https://access.redhat.com/security/cve/CVE-2021-27363
- http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html
- https://blog.grimm-co.com/2021/03/new-old-bugs-in-linux-kernel.html
- https://bugzilla.suse.com/show_bug.cgi?id=1182716
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=688e8128b7a92df982709a4137ea4588d16f24aa
- http://www.openwall.com/lists/oss-security/2021/03/06/1
- https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
- https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
- https://access.redhat.com/errata/RHSA-2021:1081