CVE-2021-4460: linux kernel Out-of-bounds Read — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Fix UBSAN shift-out-of-bounds warning If get_num_sdma_queues or get_num_xgmi_sdma_queues is 0, we end up doing a shift operation where the number of bits shifted equals number of bits in the operand. This behaviour is undefined. Set num_sdma_queues or num_xgmi_sdma_queues to ULLONG_MAX, if the count is >= number of bits in the operand. Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1472

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CVSS v3.1 Score

7.1

HIGH

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

Weakness Type (CWE)

CWE-125 Out-of-bounds Read

Affected Products

Vendor	Product	Versions
linux	linux_kernel	< 5.4.118
linux	linux_kernel	5.5 — 5.10.36
linux	linux_kernel	5.11 — 5.11.20
linux	linux_kernel	5.12 — 5.12.3

References

Advisories & Patches

https://git.kernel.org/stable/c/0c0356ef2498c1a250fe3846f30293f828737309 https://git.kernel.org/stable/c/1874b0ef1426b873de94c61861e38f29a8df714c https://git.kernel.org/stable/c/3fdc5182700910a685d23df57d65166e8556a266 https://git.kernel.org/stable/c/50e2fc36e72d4ad672032ebf646cecb48656efe0 https://git.kernel.org/stable/c/9069b1b542de8f3bbffef868aff41521b21485cf

Frequently Asked Questions

What is CVE-2021-4460? +

In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Fix UBSAN shift-out-of-bounds warning If get_num_sdma_queues or get_num_xgmi_sdma_queues is 0, we end up doing a shift operation where the number of bits shifted equals number of bits in the operand. This behaviour is undefined. Set num_sdma_queues or num_xgmi_sdma_queues to ULLONG_MAX, if the count is >= number of bits in the operand. Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1472 It has a CVSS v3.1 base score of 7.1 (HIGH).

How severe is CVE-2021-4460? +

CVE-2021-4460 has a CVSS v3.1 score of 7.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2021-4460? +

CVE-2021-4460 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-2021-4460? +

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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