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.

CVSS v3.1

4.4 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L

CVSS v2.0

3.6 LOWAV:L/AC:L/Au:N/C:P/I:N/A:P

EPSS

0.71% chance of exploitation in the next 30 days, 51th percentile

Published

2021-03-07

Updated

2024-08-03

Proof-of-concept exploits (1)

• https://blog.grimm-co.com/2021/03/new-old-bugs-in-linux-kernel.html

References

• CVE Record
• NVD entry

Related

• CVE-2021-27362
• CVE-2021-27364
• CVE-2021-27358
• CVE-2021-27365
• CVE-2021-27352
• CVE-2021-27368