What’s Vulnerable › Vulnerabilities

CVE-2021-47159: net: dsa: fix a crash if ->get_sset_count() fails

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-03-25 · updated 2026-08-04
• Weakness: CWE-835

Description

In the Linux kernel, the following vulnerability has been resolved: net: dsa: fix a crash if ->get_sset_count() fails If ds->ops->get_sset_count() fails then it "count" is a negative error code such as -EOPNOTSUPP. Because "i" is an unsigned int, the negative error code is type promoted to a very high value and the loop will corrupt memory until the system crashes. Fix this by checking for error codes and changing the type of "i" to just int.

Affected products

• Linux kernel: from 4.7 before 4.19.193; from 4.20 before 5.4.124; from 5.5 before 5.10.42; from 5.11 before 5.12.9; 5.13-rc1, 5.13-rc2, 5.13-rc3 — fixed in 4.19.193, 5.10.42, 5.12.9, 5.4.124

How to fix

Upgrade to a fixed version: Linux kernel 4.19.193, 5.10.42, 5.12.9, 5.4.124. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0f2cb08c57edefb0e7b5045e0e3e9980a3d3aa37
• https://git.kernel.org/stable/c/7b22466648a4f8e3e94f57ca428d1531866d1373
• https://git.kernel.org/stable/c/a269333fa5c0c8e53c92b5a28a6076a28cde3e83
• https://git.kernel.org/stable/c/caff86f85512b8e0d9830e8b8b0dfe13c68ce5b6
• https://git.kernel.org/stable/c/ce5355f140a7987011388c7e30c4f8fbe180d3e8
• https://git.kernel.org/stable/c/0f2cb08c57edefb0e7b5045e0e3e9980a3d3aa37
• https://git.kernel.org/stable/c/7b22466648a4f8e3e94f57ca428d1531866d1373
• https://git.kernel.org/stable/c/a269333fa5c0c8e53c92b5a28a6076a28cde3e83
• https://git.kernel.org/stable/c/caff86f85512b8e0d9830e8b8b0dfe13c68ce5b6
• https://git.kernel.org/stable/c/ce5355f140a7987011388c7e30c4f8fbe180d3e8

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