CVE-2022-49286: linux kernel Null Dereference — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: tpm: use try_get_ops() in tpm-space.c As part of the series conversion to remove nested TPM operations: https://lore.kernel.org/all/[email protected]/ exposure of the chip->tpm_mutex was removed from much of the upper level code. In this conversion, tpm2_del_space() was missed. This didn't matter much because it's usually called closely after a converted operation, so there's only a very tiny race window where the chip can be removed before the space flushing is done which causes a NULL deref on the mutex. However, there are reports of this window being hit in practice, so fix this by converting tpm2_del_space() to use tpm_try_get_ops(), which performs all the teardown checks before acquring the mutex.

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CVSS v3.1 Score

4.7

MEDIUM

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

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.12 — 5.4.188
linux	linux_kernel	5.5 — 5.10.109
linux	linux_kernel	5.11 — 5.15.32
linux	linux_kernel	5.16 — 5.16.18
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/476ddd23f818fb94cf86fb5617f3bb9a7c92113d https://git.kernel.org/stable/c/5b1d2561a03e534064b51c50c774657833d3d2cf https://git.kernel.org/stable/c/95193d12f10a8a088843b25e0f5fe1d83ec6b079 https://git.kernel.org/stable/c/ba84f9a48366dcc3cdef978599433efe101dd5bd https://git.kernel.org/stable/c/eda1662cce964c8a65bb86321f8d9cfa6e9ceaab https://git.kernel.org/stable/c/fb5abce6b2bb5cb3d628aaa63fa821da8c4600f9

Frequently Asked Questions

What is CVE-2022-49286? +

In the Linux kernel, the following vulnerability has been resolved: tpm: use try_get_ops() in tpm-space.c As part of the series conversion to remove nested TPM operations: https://lore.kernel.org/all/[email protected]/ exposure of the chip->tpm_mutex was removed from much of the upper level code. In this conversion, tpm2_del_space() was missed. This didn't matter much because it's usually called closely after a converted operation, so there's only a very tiny race window where the chip can be removed before the space flushing is done which causes a NULL deref on the mutex. However, there are reports of this window being hit in practice, so fix this by converting tpm2_del_space() to use tpm_try_get_ops(), which performs all the teardown checks before acquring the mutex. It has a CVSS v3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2022-49286? +

CVE-2022-49286 has a CVSS v3.1 score of 4.7 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-2022-49286? +

CVE-2022-49286 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-2022-49286? +

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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CVE-2022-49286