CVE-2021-27363

low-risk
Published 2021-03-07

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.

Do I need to act?

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0.03% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
4
CVSS 4.4/10 Medium
LOCAL / LOW complexity

Affected Products (4)

Affected Vendors

Debian Linux Netapp

References (16)

Third Party Advisory http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LS...
Mailing List http://www.openwall.com/lists/oss-security/2021/03/06/1
Exploit https://blog.grimm-co.com/2021/03/new-old-bugs-in-linux-kernel.html
Issue Tracking https://bugzilla.suse.com/show_bug.cgi?id=1182716
Mailing List https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=68...
Mailing List https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
Third Party Advisory https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
Third Party Advisory https://security.netapp.com/advisory/ntap-20210409-0001/
Third Party Advisory http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LS...
Mailing List http://www.openwall.com/lists/oss-security/2021/03/06/1
Exploit https://blog.grimm-co.com/2021/03/new-old-bugs-in-linux-kernel.html
Issue Tracking https://bugzilla.suse.com/show_bug.cgi?id=1182716
Mailing List https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=68...
Mailing List https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
Third Party Advisory https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
Third Party Advisory https://security.netapp.com/advisory/ntap-20210409-0001/
25
/ 100
low-risk
Severity 15/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 10/34 · Low