Vulnerability in Linux Kernel
CVE-2021-27363
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.
EPSS: 0.007 (49.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L.
Affected products
- Linux Linux_kernel
- Netapp Cloud_backup
- Netapp Solidfire_baseboard_management_controller_firmware
- Debian Debian_linux — versions 9.0
- N/a — versions n/a
Public proof-of-concept exploits
- ARPSyndicate/cvemon
- Iweisc/Kernel-Module-192CV
- aaronxie55/Presentation2_
- bollwarm/SecToolSet
- c4pt000/kernel-5.11.6-expSEHDsec-HAXM-cgroup-virtio-nvidia-amd-kaliwifi
- c4pt000/kernel-6.6.0-expSEHDsec-HAXM-cgroup-virtio-nvidia-amd-kaliwifi
- c4pt000/kernel-6.8.2-expSEHDsec-HAXM-cgroupvirtio
- c4pt000/kernel-6.8.3-expSEHDsec-fclock-fsync-cpu
- kdn111/linux-kernel-exploitation
- khanhdn111/linux-kernel-exploitation
References
- cve@mitre.org (Patch, Mailing List, Third Party Advisory, x_refsource_MISC)
- cve@mitre.org (Third Party Advisory, x_refsource_MISC, Issue Tracking)
- cve@mitre.org (Patch, Mailing List, x_refsource_MISC, Vendor Advisory)
- cve@mitre.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)
- cve@mitre.org (mailing-list, x_refsource_MLIST, Third Party Advisory)
- cve@mitre.org (VDB Entry, Third Party Advisory, x_refsource_MISC)
- cve@mitre.org (x_refsource_CONFIRM, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-27363?
- CVE-2021-27363 is a medium-severity vulnerability in Linux Kernel. CVSS score: 4.4/10. Published 2021-03-07.
- How severe is CVE-2021-27363?
- Medium severity. CVSS v3 base score is 4.4 out of 10.
- Is CVE-2021-27363 known to be exploited?
- 23 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.