TI-2021-21985 Aliases CVE-2021-47328 GHSA-3whv-3wrh-jjqq

scsi: iscsi: Fix conn use after free during resets

MEDIUM 43CWE-416Published 2024-05-21 · Updated 2026-08-05

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Partial Red Hat: 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

In the Linux kernel, the following vulnerability has been resolved: scsi: iscsi: Fix conn use after free during resets If we haven't done a unbind target call we can race where iscsi_conn_teardown wakes up the EH thread and then frees the conn while those threads are still accessing the conn ehwait. We can only do one TMF per session so this just moves the TMF fields from the conn to the session. We can then rely on the iscsi_session_teardown->iscsi_remove_session->__iscsi_unbind_session call to remove the target and it's devices, and know after that point there is no device or scsi-ml callout trying to access the session.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00766 55th percentileScored 2026-11-07

Fix Partial Linux (Linux): 3.3, 3.5, 3.19 +7Red Hat: 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Linux	Linux	3.2.72 to before 3.3; 3.4.111 to before 3.5; 3.18.22 to before 3.19; 4.1.7 to before 4.2	3.3, 3.5, 3.19, 4.2	Patch available	CNA
Linux	Linux	4.2 and later	4.19.198, 5.4.134, 5.10.52, 5.12.19, 5.13.4, 5.14	Patch available	CNA

Linux VendorLinux Affected 3.2.72 to before 3.3; 3.4.111 to before 3.5; 3.18.22 to before 3.19; 4.1.7 to before 4.2 Fixed in 3.3, 3.5, 3.19, 4.2 Patch available CNA
Linux VendorLinux Affected 4.2 and later Fixed in 4.19.198, 5.4.134, 5.10.52, 5.12.19, 5.13.4, 5.14 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:o:linux:linux_kernel::::::::	before 4.19.198; 4.20 to before 5.4.134; 5.5 to before 5.10.52; 5.11 to before 5.12.19; 5.13 to before 5.13.4	Vulnerable	Linux

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions before 4.19.198; 4.20 to before 5.4.134; 5.5 to before 5.10.52; 5.11 to before 5.12.19; 5.13 to before 5.13.4 Vulnerable ·Linux

Remediation

Fix · CNA Linux (Linux) Fixed in 3.3, 3.5, 3.19, 4.2
Fix · CNA Linux (Linux) Fixed in 4.19.198, 5.4.134, 5.10.52, 5.12.19, 5.13.4, 5.14

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 6	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux 7	Affected	No fix planned: Out of support scope

Not affected: 2 products

Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9

Timeline

2026-10-02 Threatist record created from CVE-2021-47328
2026-10-03 Alias added: GHSA-3whv-3wrh-jjqq

References

Patch 6

TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3

See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences