CVE-2022-50288: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: qlcnic: prevent ->dcb use-after-free on qlcnic_dcb_enable() failure adapter->dcb would get silently freed inside qlcnic_dcb_enable() in case qlcnic_dcb_attach() would return an error, which always happens under OOM conditions. This would lead to use-after-free because both of the existing callers invoke qlcnic_dcb_get_info() on the obtained pointer, which is potentially freed at that point. Propagate errors from qlcnic_dcb_enable(), and instead free the dcb pointer at callsite using qlcnic_dcb_free(). This also removes the now unused qlcnic_clear_dcb_ops() helper, which was a simple wrapper around kfree() also causing memory leaks for partially initialized dcb. Found by Linux Verification Center (linuxtesting.org) with the SVACE static analysis tool.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
linux	linux_kernel	3.14 — 4.14.303
linux	linux_kernel	4.15 — 4.19.270
linux	linux_kernel	4.20 — 5.4.229
linux	linux_kernel	5.5 — 5.10.163
linux	linux_kernel	5.11 — 5.15.87
linux	linux_kernel	5.16 — 6.0.19
linux	linux_kernel	6.1 — 6.1.5
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/13a7c8964afcd8ca43c0b6001ebb0127baa95362 https://git.kernel.org/stable/c/36999236f0b12d5de21a6f40e93b570727b9ceb2 https://git.kernel.org/stable/c/513787ff9a331b461115e8a145a983d650a84fcb https://git.kernel.org/stable/c/8df1dc04ce0e4c03b51a756749c250a9cb17d707 https://git.kernel.org/stable/c/8f97eeb02a553cdc78c83a0596448a370e1518c4 https://git.kernel.org/stable/c/95df720e64a6409d8152827a776c43f615e3321a https://git.kernel.org/stable/c/a2a694e6edbdb3efb34e1613a31fdcf6cf444a55 https://git.kernel.org/stable/c/d12a7510293d3370b234b0b7c5eda33e58786768

Frequently Asked Questions

What is CVE-2022-50288? +

In the Linux kernel, the following vulnerability has been resolved: qlcnic: prevent ->dcb use-after-free on qlcnic_dcb_enable() failure adapter->dcb would get silently freed inside qlcnic_dcb_enable() in case qlcnic_dcb_attach() would return an error, which always happens under OOM conditions. This would lead to use-after-free because both of the existing callers invoke qlcnic_dcb_get_info() on the obtained pointer, which is potentially freed at that point. Propagate errors from qlcnic_dcb_enable(), and instead free the dcb pointer at callsite using qlcnic_dcb_free(). This also removes the now unused qlcnic_clear_dcb_ops() helper, which was a simple wrapper around kfree() also causing memory leaks for partially initialized dcb. Found by Linux Verification Center (linuxtesting.org) with the SVACE static analysis tool. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-50288? +

CVE-2022-50288 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2022-50288? +

CVE-2022-50288 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2022-50288? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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