CVE-2021-27363

NameCVE-2021-27363
DescriptionAn 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2586-1, DLA-2610-1
NVD severitylow

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)stretch4.9.228-1vulnerable
stretch (security)4.9.258-1fixed
buster4.19.181-1fixed
buster (security)4.19.171-2vulnerable
bullseye, sid5.10.28-1fixed
linux-4.19 (PTS)stretch (security)4.19.181-1~deb9u1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsourcestretch4.9.258-1DLA-2586-1
linuxsourcebuster4.19.181-1
linuxsource(unstable)5.10.24-1
linux-4.19sourcestretch4.19.181-1~deb9u1DLA-2610-1

Notes

https://git.kernel.org/linus/688e8128b7a92df982709a4137ea4588d16f24aa

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