CVE-2021-47013

Severity CVSS v4.0:

Pending analysis

Type:

CWE-416 Use After Free

Publication date:

28/02/2024

Last modified:

09/12/2024

Description

In the Linux kernel, the following vulnerability has been resolved: net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send In emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..). If some error happens in emac_tx_fill_tpd(), the skb will be freed via dev_kfree_skb(skb) in error branch of emac_tx_fill_tpd(). But the freed skb is still used via skb->len by netdev_sent_queue(,skb->len). As i observed that emac_tx_fill_tpd() haven&#39;t modified the value of skb->len, thus my patch assigns skb->len to &#39;len&#39; before the possible free and use &#39;len&#39; instead of skb->len later.

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x

7.80

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::	4.9 (including)	4.9.269 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.10 (including)	4.14.233 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.15 (including)	4.19.191 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.20 (including)	5.4.119 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.5 (including)	5.10.37 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.11 (including)	5.11.21 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.12 (including)	5.12.4 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2021-47013

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools