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Vulnerability · Published Mar 7, 2021 · Assigned by mitre

CVE-2021-27363

Medium 4.4

In plain English

A medium-severity security flaw in the kernel-abi-whitelists package (AlmaLinux). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)4.4Medium
Exploit odds (30 days)0.7%top 46.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8kernel-abi-whitelists4.18.0-240.22.1.el8_3ALSA-2021:1093
AlmaLinux:8kernel-tools-libs-devel4.18.0-240.22.1.el8_3ALSA-2021:1093
Debian:12linux5.10.24-1DEBIAN-CVE-2021-27363
Debian:13linux5.10.24-1DEBIAN-CVE-2021-27363
Debian:14linux5.10.24-1DEBIAN-CVE-2021-27363
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-27363
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-27363
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-27363

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References