Vulnerability Description
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 differential checking to identify inconsistent security operations (e.g., checks or kfrees) between two code paths and confirms that the inconsistent operations are not recovered in the current function or the callers, so they constitute bugs. Note that, as a bug found by static analysis, it can be a false positive or hard to trigger. Multiple researchers have cross-reviewed the bug. Builds with CONFIG_MLX4_EN=m show no new warnings, and our static analyzer no longer warns about this code.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.7, < 4.14.257 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/676dc7d9b15bf8733233a2db1ec3f9091ab34275Patch
- https://git.kernel.org/stable/c/75917372eef0dbfb290ae45474314d35f97aea18Patch
- https://git.kernel.org/stable/c/addad7643142f500080417dd7272f49b7a185570Patch
- https://git.kernel.org/stable/c/be12572c5ddc8ad7453bada4eec8fa46967dc757Patch
- https://git.kernel.org/stable/c/e461a9816a1ac5b4aeb61621b817225b61e46a68Patch
- https://git.kernel.org/stable/c/f1d43efa59f1edd3e7eca0e94559b4c6b1cd4e2bPatch
- https://git.kernel.org/stable/c/676dc7d9b15bf8733233a2db1ec3f9091ab34275Patch
- https://git.kernel.org/stable/c/75917372eef0dbfb290ae45474314d35f97aea18Patch
- https://git.kernel.org/stable/c/addad7643142f500080417dd7272f49b7a185570Patch
- https://git.kernel.org/stable/c/be12572c5ddc8ad7453bada4eec8fa46967dc757Patch
- https://git.kernel.org/stable/c/e461a9816a1ac5b4aeb61621b817225b61e46a68Patch
- https://git.kernel.org/stable/c/f1d43efa59f1edd3e7eca0e94559b4c6b1cd4e2bPatch
FAQ
What is CVE-2021-47541?
CVE-2021-47541 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 c...
How severe is CVE-2021-47541?
CVE-2021-47541 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47541?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.