Home/CVE/An issue was discovered in the Linux kernel through 5.11.3. A kernel pointer leak can be used to determine the address o
CVE

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 o

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.

MEDIUM · CVSS 4.4 EPSS 0.00036
Schedule remediation
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
▤

Affected Products & Versions

4
linux kernel<= 5.11.3
debian linuxall versions
netapp cloud backupall versions
netapp solidfire baseboard management controller firmwareall versions
⚠

Public Exploits & PoCs

2
pocpacketstormsecurity.com · Kernel-Live-Patch-Security-Notice-LSN-0075-1.htmlpacketstormsecurity.com
pocblog.grimm-co.com · new-old-bugs-in-linux-kernel.htmlblog.grimm-co.com
▣

Scoring & Timeline

4.4
MEDIUM · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD07 Mar 2021 · 04:15 AM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L
⚑

Vendor Advisories

30
suse-csafSUSE-SU-2021:2577-1
suse-csafopenSUSE-SU-2021:1975-1
suse-csafopenSUSE-SU-2021:1977-1
suse-csafSUSE-SU-2021:1975-1
suse-csafSUSE-SU-2021:1977-1
🔗

References & Sources

6
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.openwall.com/lists/oss-security/2021/03/06/1Mailing ListPatchThird Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1182716Issue TrackingThird Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=688e8128b7a92df982709a4137ea4588d16f24aaMailing ListPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.htmlMailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00035.htmlThird Party Advisory
https://security.netapp.com/advisory/ntap-20210409-0001/Third Party Advisory
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