by Kastro
Paper/Archive/CVE-2021-47427

CVE-2021-47427

Linux Linux — scsi: iscsi: Fix iscsi_task use after free

EPSS 0.5%CVSS 9.8
critical.is priorityof 100
37
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 40.1.401 × 208.0No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Linuxd39df158518ccc3bf24ee18082b5e100c8f014aa – < 1642f51ac0d4f2b55d5748094c49ff8f7191b93c1642f51ac0d4f2b55d5748094c49ff8f7191b93cCNA
Linuxd39df158518ccc3bf24ee18082b5e100c8f014aa – < 258aad75c62146453d03028a44f2f1590d58e1f6258aad75c62146453d03028a44f2f1590d58e1f6CNA
Linux5.145.14.12CNA

Scores by source

Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refgit.kernel.org/stable/c/1642f51ac0d4f2b55d5748094c49ff8f7191b93crefgit.kernel.org/stable/c/258aad75c62146453d03028a44f2f1590d58e1f6