TI-2021-21959 Aliases CVE-2021-47301 GHSA-9h2q-cwg7-7wx8

igb: Fix use-after-free error during reset

LOW 34CWE-416Published 2024-05-21 · Updated 2026-05-11

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Partial Red Hat: 2 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. 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: igb: Fix use-after-free error during reset Cleans the next descriptor to watch (next_to_watch) when cleaning the TX ring. Failure to do so can cause invalid memory accesses. If igb_poll() runs while the controller is reset this can lead to the driver try to free a skb that was already freed. (The crash is harder to reproduce with the igb driver, but the same potential problem exists as the code is identical to igc)

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00239 15th percentileScored 2026-11-07

Fix Partial Linux (Linux): 4.14.241, 4.19.199, 5.4.136 +3Red Hat: 1 advisoryRed Hat: 2 fixed, 1 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	4.12 and later	4.14.241, 4.19.199, 5.4.136, 5.10.54, 5.13.6, 5.14	Patch available	CNA

Linux VendorLinux Affected 4.12 and later Fixed in 4.14.241, 4.19.199, 5.4.136, 5.10.54, 5.13.6, 5.14 Patch available CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:o:linux:linux_kernel::::::::	4.12 to before 4.14.241; 4.15 to before 4.19.199; 4.20 to before 5.4.136; 5.5 to before 5.10.54; 5.11 to before 5.13.6	Vulnerable	Linux
cpe:2.3:o:linux:linux_kernel:5.14:rc1::::::	5.14 rc1	Vulnerable	Linux

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.12 to before 4.14.241; 4.15 to before 4.19.199; 4.20 to before 5.4.136; 5.5 to before 5.10.54; 5.11 to before 5.13.6 Vulnerable ·Linux
cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:* Versions 5.14 rc1 Vulnerable ·Linux

Remediation

Fix · CNA Linux (Linux) Fixed in 4.14.241, 4.19.199, 5.4.136, 5.10.54, 5.13.6, 5.14

Red Hat 1 advisory

RHSA-2022:1988 Released 2022-05-10 · Red Hat rating Important
kernel security, bug fix, and enhancement update
- Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-372.9.1.el8, kernel-4.18.0-372.9.1.el8, kernel-abi-stablelists-4.18.0-372.9.1.el8 +19
- Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-372.9.1.el8

Vendor assessments

Red Hat

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

Product	Status	Plan or fix
Red Hat Enterprise Linux 7	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux BaseOS (v. 8)	Fixed	RHSA-2022:1988
Red Hat Enterprise Linux CRB (v. 8)	Fixed	RHSA-2022:1988

Not affected: 3 products

Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9

Timeline

2026-10-02 Threatist record created from CVE-2021-47301
2026-10-03 Alias added: GHSA-9h2q-cwg7-7wx8
2026-11-05 Affected versions changed · Red Hat

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