Review reviewHigh

CVE-2021-47427

Linux Linux, linux kernel

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...

CVSS: 7.8
EPSS: 0.46%
CISA KEV: Not listed
Published: 2024.05.22

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.46%

Technical severityCVSS 7.8

Vulnerability overview

Affected product and versions

Product: Linux Linux, linux kernel
Affected versions: >= d39df158518ccc3bf24ee18082b5e100c8f014aa < 1642f51ac0d4f2b55d5748094c49ff8f7191b93c, >= d39df158518ccc3bf24ee18082b5e100c8f014aa < 258aad75c62146453d03028a44f2f1590d58e1f6, >= 5.14, >= 5.14 < 5.14.12, 5.15
Fixed versions: 5.14.12

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Linux Linux, linux kernel and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-416