CVE - CVE-2021-47541

CVE-ID
CVE-2021-47541	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/676dc7d9b15bf8733233a2db1ec3f9091ab34275 URL:https://git.kernel.org/stable/c/676dc7d9b15bf8733233a2db1ec3f9091ab34275 MISC:https://git.kernel.org/stable/c/75917372eef0dbfb290ae45474314d35f97aea18 URL:https://git.kernel.org/stable/c/75917372eef0dbfb290ae45474314d35f97aea18 MISC:https://git.kernel.org/stable/c/addad7643142f500080417dd7272f49b7a185570 URL:https://git.kernel.org/stable/c/addad7643142f500080417dd7272f49b7a185570 MISC:https://git.kernel.org/stable/c/be12572c5ddc8ad7453bada4eec8fa46967dc757 URL:https://git.kernel.org/stable/c/be12572c5ddc8ad7453bada4eec8fa46967dc757 MISC:https://git.kernel.org/stable/c/e461a9816a1ac5b4aeb61621b817225b61e46a68 URL:https://git.kernel.org/stable/c/e461a9816a1ac5b4aeb61621b817225b61e46a68 MISC:https://git.kernel.org/stable/c/f1d43efa59f1edd3e7eca0e94559b4c6b1cd4e2b URL:https://git.kernel.org/stable/c/f1d43efa59f1edd3e7eca0e94559b4c6b1cd4e2b
Assigning CNA
kernel.org
Date Record Created
20240524	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240524)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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