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CVE-2021-47232

Linux Kernel use-after-free

9.8 CRITICALEPSS 0.62%
  1. Published21 May 2024

Description

In the Linux kernel, the following vulnerability has been resolved: can: j1939: fix Use-after-Free, hold skb ref while in use This patch fixes a Use-after-Free found by the syzbot. The problem is that a skb is taken from the per-session skb queue, without incrementing the ref count. This leads to a Use-after-Free if the skb is taken concurrently from the session queue due to a CTS.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Linux Kernel≥ 5.11 < 5.12.13 · ≥ 5.4 < 5.4.128 · ≥ 5.5 < 5.10.46 · 5.13

Remediation

Fixed in
Linux Kernel≥ 5.12.13

References

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Frequently asked

Is CVE-2021-47232 being actively exploited?

CVE-2021-47232 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.62%.

How severe is CVE-2021-47232?

CVE-2021-47232 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.62% probability of exploitation.

Which products are affected by CVE-2021-47232?

Affected products include Linux Kernel.

How do I fix CVE-2021-47232?

Upgrade affected software to a fixed version, for example Linux Kernel 5.12.13 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-47232 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.