CVE-2021-47541 remediation guide

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: net/mlx4_en: Fix an use-after-free bug in mlx4_en_try_alloc_resources() In mlx4_en_try_alloc_resources(), mlx4_en_copy_priv() is called and tmp->tx_cq will be freed on the error path of mlx4_en_copy_priv(). After that mlx4_en_alloc_resources() is called and there is a dereference of &tmp->tx_cq[t][i] in mlx4_en_alloc_resources(), which could lead to a use after free problem on failure of mlx4_en_copy_priv(). Fix this bug by adding a check of mlx4_en_copy_priv() This bug was found by a static analyzer. The analysis employs d...

Open CVE record

ProductLinux Linux, linux kernel

Affected versions>= ec25bc04ed8e12947738468cbe2191f1529f9e39 < be12572c5ddc8ad7453bada4eec8fa46967dc757, >= ec25bc04ed8e12947738468cbe2191f1529f9e39 < 676dc7d9b15bf8733233a2db1ec3f9091ab34275, >= ec25bc04ed8e12947738468cbe2191f1529f9e39 < e461a9816a1ac5b4aeb61621b817225b61e46a68, >= ec25bc04ed8e12947738468cbe2191f1529f9e39 < f1d43efa59f1edd3e7eca0e94559b4c6b1cd4e2b, >= ec25bc04ed8e12947738468cbe2191f1529f9e39 < 75917372eef0dbfb290ae45474314d35f97aea18, >= ec25bc04ed8e12947738468cbe2191f1529f9e39 < addad7643142f500080417dd7272f49b7a185570, >= 4.7, >= 4.7 < 4.14.257, >= 4.15 < 4.19.220, >= 4.20 < 5.4.164, >= 5.5 < 5.10.84, >= 5.11 < 5.15.7

Fixed versions4.14.257, 4.19.220, 5.4.164, 5.10.84, 5.15.7

Priority basisReview · CVSS 7.8 · EPSS 0.29%

Identify the affected asset

Confirm whether Linux Linux, linux kernel is installed, record the deployed version and installation path, and identify exposed interfaces.

Record the product name, package or appliance identifier, and installed version.
Identify internet-facing, administrative, API, and internal access paths.
Preserve the pre-change configuration and relevant service logs.

Validate the affected-version match

Compare the deployed version with the affected range: >= ec25bc04ed8e12947738468cbe2191f1529f9e39 < be12572c5ddc8ad7453bada4eec8fa46967dc757, >= ec25bc04ed8e12947738468cbe2191f1529f9e39 < 676dc7d9b15bf8733233a2db1ec3f9091ab34275, >= ec25bc04ed8e12947738468cbe2191f1529f9e39 < e461a9816a1ac5b4aeb61621b817225b61e46a68, >= ec25bc04ed8e12947738468cbe2191f1529f9e39 < f1d43efa59f1edd3e7eca0e94559b4c6b1cd4e2b, >= ec25bc04ed8e12947738468cbe2191f1529f9e39 < 75917372eef0dbfb290ae45474314d35f97aea18, >= ec25bc04ed8e12947738468cbe2191f1529f9e39 < addad7643142f500080417dd7272f49b7a185570, >= 4.7, >= 4.7 < 4.14.257, >= 4.15 < 4.19.220, >= 4.20 < 5.4.164, >= 5.5 < 5.10.84, >= 5.11 < 5.15.7. Treat incomplete inventory results as unresolved.

Prioritize with independent signals

The CVSS severity warrants an early asset and exposure review. Combine this signal with asset criticality, exposure, compensating controls, and business impact.

Apply supported remediation

Follow the vendor advisory or supported update path. Current fixed-version status: 4.14.257, 4.19.220, 5.4.164, 5.10.84, 5.15.7. Preserve configuration and rollback material before change.

Verify the result

Confirm the resulting version, service health, authentication and access paths, monitoring coverage, and relevant security logs.

Confirm the expected version and package state.
Run a functional health check for critical service paths.
Review authentication, error, application, and security monitoring logs.
Reassess exposure if the supported fix cannot be applied.

Operational boundary

This page does not replace the vendor advisory, support contract, change-management process, or recovery plan. Do not infer that an asset is unaffected from an incomplete inventory query or a missing fixed-version field.