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Critical severity9.8NVD Advisory· Published May 21, 2024· Updated Aug 4, 2026

CVE-2021-47232

CVE-2021-47232

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

9
  • Linux/Kernel9 versions
    cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 8 more
    • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=5.4,<5.4.128
    • cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:*
    • (no CPE)
    • (no CPE)range: 5.4

Patches

Vulnerability mechanics

References

4

News mentions

0

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