CVE-2021-47427

Name	CVE-2021-47427
Description	In the Linux kernel, the following vulnerability has been resolved: scsi: iscsi: Fix iscsi_task use after free Commit d39df158518c ("scsi: iscsi: Have abort handler get ref to conn") added iscsi_get_conn()/iscsi_put_conn() calls during abort handling but then also changed the handling of the case where we detect an already completed task where we now end up doing a goto to the common put/cleanup code. This results in a iscsi_task use after free, because the common cleanup code will do a put on the iscsi_task. This reverts the goto and moves the iscsi_get_conn() to after we've checked if the iscsi_task is valid.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
linux (PTS)	bullseye	5.10.218-1	fixed
	bullseye (security)	5.10.221-1	fixed
	bookworm	6.1.94-1	fixed
	bookworm (security)	6.1.99-1	fixed
	trixie	6.9.10-1	fixed
	sid	6.9.11-1	fixed

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

Package	Type	Release	Fixed Version
linux	source	buster	(not affected)
linux	source	bullseye	(not affected)
linux	source	(unstable)	5.14.12-1

Notes

[bullseye] - linux <not-affected> (Vulnerable code not present)
[buster] - linux <not-affected> (Vulnerable code not present)
https://git.kernel.org/linus/258aad75c62146453d03028a44f2f1590d58e1f6 (5.15-rc5)