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CVE-2021-46973

HIGH
Published 2024-02-27T18:47:07.880Z
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CVSS Score

V3.1
8.4
/10
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.000
probability
of exploitation in the wild

There is a 0.0% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.035
Higher than 3.5% of all CVEs

Attack Vector Metrics

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Description

In the Linux kernel, the following vulnerability has been resolved:

net: qrtr: Avoid potential use after free in MHI send

It is possible that the MHI ul_callback will be invoked immediately
following the queueing of the skb for transmission, leading to the
callback decrementing the refcount of the associated sk and freeing the
skb.

As such the dereference of skb and the increment of the sk refcount must
happen before the skb is queued, to avoid the skb to be used after free
and potentially the sk to drop its last refcount..

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

Linux

Linux

Affected Versions:

6e728f321393b1fce9e1c2c3e55f9f7c15991321 6e728f321393b1fce9e1c2c3e55f9f7c15991321 6e728f321393b1fce9e1c2c3e55f9f7c15991321 6e728f321393b1fce9e1c2c3e55f9f7c15991321
Linux

Linux

Affected Versions:

5.8 0 5.10.35 5.11.19 5.12.2 5.13
linux

linux_kernel

Affected Versions:

6e728f321393 6e728f321393 6e728f321393 6e728f321393 5.8 0 5.10.35 5.11.19 5.12.2 5.13

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed HIGH

GHSA-pwwc-8qxc-5w7f

Advisory Details

In the Linux kernel, the following vulnerability has been resolved: net: qrtr: Avoid potential use after free in MHI send It is possible that the MHI ul_callback will be invoked immediately following the queueing of the skb for transmission, leading to the callback decrementing the refcount of the associated sk and freeing the skb. As such the dereference of skb and the increment of the sk refcount must happen before the skb is queued, to avoid the skb to be used after free and potentially the sk to drop its last refcount..

CVSS Scoring

CVSS Score

7.5

CVSS Vector

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

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2021-46973
WEB https://git.kernel.org/stable/c/03c649dee8b1eb5600212a249542a70f47a5ab40
WEB https://git.kernel.org/stable/c/47a017f33943278570c072bc71681809b2567b3a
WEB https://git.kernel.org/stable/c/48ec949ac979b4b42d740f67b6177797af834f80
WEB https://git.kernel.org/stable/c/ea474054c2cc6e1284604b21361f475c7cc8c0a0

Advisory provided by GitHub Security Advisory Database. Published: February 27, 2024, Modified: August 1, 2024

References

https://git.kernel.org/stable/c/48ec949ac979b4b42d740f67b6177797af834f80
https://git.kernel.org/stable/c/ea474054c2cc6e1284604b21361f475c7cc8c0a0
https://git.kernel.org/stable/c/03c649dee8b1eb5600212a249542a70f47a5ab40
https://git.kernel.org/stable/c/47a017f33943278570c072bc71681809b2567b3a
Published: 2024-02-27T18:47:07.880Z
Last Modified: 2025-05-04T07:01:28.129Z
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