0.0
NA
CVE-2021-47013
"VMware Linux Kernel Use After Free (UAF) Vulnerability"
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't modified the value of skb->len, thus my patch assigns skb->len to 'len' before the possible free and use 'len' instead of skb->len later.

INFO

Published Date :

Feb. 28, 2024, 9:15 a.m.

Last Modified :

Feb. 28, 2024, 2:06 p.m.

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Remotely Exploitable :

No

Impact Score :

Exploitability Score :

Affected Products

The following products are affected by CVE-2021-47013 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-47013.

URL Resource
https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834
https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d
https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57
https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7
https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d
https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955
https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322
https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-47013 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-47013 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    May. 28, 2024

    Action Type Old Value New Value
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Feb. 28, 2024

    Action Type Old Value New Value
    Added 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't modified the value of skb->len, thus my patch assigns skb->len to 'len' before the possible free and use 'len' instead of skb->len later.
    Added Reference Linux https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955 [No types assigned]
    Added Reference Linux https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322 [No types assigned]
    Added Reference Linux https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834 [No types assigned]
    Added Reference Linux https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d [No types assigned]
    Added Reference Linux https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d [No types assigned]
    Added Reference Linux https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7 [No types assigned]
    Added Reference Linux https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b [No types assigned]
    Added Reference Linux https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57 [No types assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-47013 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-47013 weaknesses.

NONE - Vulnerability Scoring System
: