CVE-2021-27363

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    CVE-2021-27363

    Published: 7 Mar 2021Last Modified: 16 Apr 2026

    Summary:

    Details: 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.

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

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-27363 | CVE-DB