CVE-2022-50240: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: android: binder: stop saving a pointer to the VMA Do not record a pointer to a VMA outside of the mmap_lock for later use. This is unsafe and there are a number of failure paths *after* the recorded VMA pointer may be freed during setup. There is no callback to the driver to clear the saved pointer from generic mm code. Furthermore, the VMA pointer may become stale if any number of VMA operations end up freeing the VMA so saving it was fragile to being with. Instead, change the binder_alloc struct to record the start address of the VMA and use vma_lookup() to get the vma when needed. Add lockdep mmap_lock checks on updates to the vma pointer to ensure the lock is held and depend on that lock for synchronization of readers and writers - which was already the case anyways, so the smp_wmb()/smp_rmb() was not necessary. [[email protected]: fix drivers/android/binder_alloc_selftest.c]

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CVSS v3.1 Score

7.8

HIGH

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

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.20 — 5.4.224
linux	linux_kernel	5.5 — 5.10.154
linux	linux_kernel	5.11 — 5.15.61
linux	linux_kernel	5.16 — 5.18.18
linux	linux_kernel	5.19 — 5.19.2

References

Advisories & Patches

https://git.kernel.org/stable/c/015ac18be7de25d17d6e5f1643cb3b60bfbe859e https://git.kernel.org/stable/c/1ec3f76a436d750fd5023caec5da0494fc2870d2 https://git.kernel.org/stable/c/27a594bc7a7c8238d239e3cdbcf2edfa3bbe9a1b https://git.kernel.org/stable/c/622ef885a89ad04cfb76ee478fb44f051125d1f1 https://git.kernel.org/stable/c/925e6b6f82c9c80ab3c17acbde8d16f349da7d26 https://git.kernel.org/stable/c/a43cfc87caaf46710c8027a8c23b8a55f1078f19

Frequently Asked Questions

What is CVE-2022-50240? +

In the Linux kernel, the following vulnerability has been resolved: android: binder: stop saving a pointer to the VMA Do not record a pointer to a VMA outside of the mmap_lock for later use. This is unsafe and there are a number of failure paths *after* the recorded VMA pointer may be freed during setup. There is no callback to the driver to clear the saved pointer from generic mm code. Furthermore, the VMA pointer may become stale if any number of VMA operations end up freeing the VMA so saving it was fragile to being with. Instead, change the binder_alloc struct to record the start address of the VMA and use vma_lookup() to get the vma when needed. Add lockdep mmap_lock checks on updates to the vma pointer to ensure the lock is held and depend on that lock for synchronization of readers and writers - which was already the case anyways, so the smp_wmb()/smp_rmb() was not necessary. [[email protected]: fix drivers/android/binder_alloc_selftest.c] It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-50240? +

CVE-2022-50240 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2022-50240? +

CVE-2022-50240 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-2022-50240? +

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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