HOMEVULNERABILITIESCVE-2021-27363
MEDIUM

CVE-2021-27363

NVD-CWE-noinfoPublished: March 7, 2021· Updated: Jun 17, 2026

4.4
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2021-27363 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityNone
AvailabilityLow
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L

Affected Vendors & Products

Debian1 product(s)
debian linux
Linux1 product(s)
linux kernel
netapp2 product(s)
cloud backupsolidfire baseboard management controller firmware
Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttp://www.openwall.com/lists/oss-security/2021/03/06/1
PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=688e8128b7a92df982709a4137ea4588d16f24aa
PATCHhttp://www.openwall.com/lists/oss-security/2021/03/06/1
PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=688e8128b7a92df982709a4137ea4588d16f24aa
ADVISORYhttp://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html
ADVISORYhttps://blog.grimm-co.com/2021/03/new-old-bugs-in-linux-kernel.html
ADVISORYhttps://bugzilla.suse.com/show_bug.cgi?id=1182716
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
ADVISORYhttps://security.netapp.com/advisory/ntap-20210409-0001/
ADVISORYhttp://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html
ADVISORYhttps://blog.grimm-co.com/2021/03/new-old-bugs-in-linux-kernel.html
ADVISORYhttps://bugzilla.suse.com/show_bug.cgi?id=1182716
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
ADVISORYhttps://security.netapp.com/advisory/ntap-20210409-0001/

All References (16)

→
http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.htmlThird Party Advisory · VDB Entry
→
http://www.openwall.com/lists/oss-security/2021/03/06/1Mailing List · Patch · Third Party Advisory
→
https://blog.grimm-co.com/2021/03/new-old-bugs-in-linux-kernel.htmlExploit · Third Party Advisory
→
https://bugzilla.suse.com/show_bug.cgi?id=1182716Issue Tracking · Third Party Advisory
→
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=688e8128b7a92df982709a4137ea4588d16f24aaMailing List · Patch · Vendor Advisory
→
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.htmlMailing List · Third 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
→
http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.htmlThird Party Advisory · VDB Entry
→
http://www.openwall.com/lists/oss-security/2021/03/06/1Mailing List · Patch · Third Party Advisory
→
https://blog.grimm-co.com/2021/03/new-old-bugs-in-linux-kernel.htmlExploit · Third Party Advisory
→
https://bugzilla.suse.com/show_bug.cgi?id=1182716Issue Tracking · Third Party Advisory
→
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=688e8128b7a92df982709a4137ea4588d16f24aaMailing List · Patch · Vendor Advisory
→
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2021/03/msg00035.htmlThird Party Advisory

Quick Facts

CVE IDCVE-2021-27363
CVSS Score4.4 / 10
SeverityMEDIUM
WeaknessNVD-CWE-noinfo
CISA KEVNo
Affected3 vendor(s)
PublishedMar 7, 2021

Related CVEs (NVD-CWE-noinfo)

CVE-2017-10405
10.0
CVE-2017-10151
10.0
CVE-2017-10137
10.0
CVE-2017-10402
10.0
CVE-2017-10912
10.0
CVE-2017-10269
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-27363 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2021-27363·NVD