CVE-2022-48714: linux kernel Out-of-bounds Read — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Use VM_MAP instead of VM_ALLOC for ringbuf After commit 2fd3fb0be1d1 ("kasan, vmalloc: unpoison VM_ALLOC pages after mapping"), non-VM_ALLOC mappings will be marked as accessible in __get_vm_area_node() when KASAN is enabled. But now the flag for ringbuf area is VM_ALLOC, so KASAN will complain out-of-bound access after vmap() returns. Because the ringbuf area is created by mapping allocated pages, so use VM_MAP instead. After the change, info in /proc/vmallocinfo also changes from [start]-[end] 24576 ringbuf_map_alloc+0x171/0x290 vmalloc user to [start]-[end] 24576 ringbuf_map_alloc+0x171/0x290 vmap user

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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	5.8 — 5.10.99
linux	linux_kernel	5.11 — 5.15.22
linux	linux_kernel	5.16 — 5.16.8
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/5e457aeab52a5947619e1f18047f4d2f3212b3eb https://git.kernel.org/stable/c/6304a613a97d6dcd49b93fbad31e9f39d1e138d6 https://git.kernel.org/stable/c/b293dcc473d22a62dc6d78de2b15e4f49515db56 https://git.kernel.org/stable/c/d578933f6226d5419af9306746efa1c693cbaf9c https://git.kernel.org/stable/c/5e457aeab52a5947619e1f18047f4d2f3212b3eb https://git.kernel.org/stable/c/6304a613a97d6dcd49b93fbad31e9f39d1e138d6 https://git.kernel.org/stable/c/b293dcc473d22a62dc6d78de2b15e4f49515db56 https://git.kernel.org/stable/c/d578933f6226d5419af9306746efa1c693cbaf9c

Frequently Asked Questions

What is CVE-2022-48714? +

In the Linux kernel, the following vulnerability has been resolved: bpf: Use VM_MAP instead of VM_ALLOC for ringbuf After commit 2fd3fb0be1d1 ("kasan, vmalloc: unpoison VM_ALLOC pages after mapping"), non-VM_ALLOC mappings will be marked as accessible in __get_vm_area_node() when KASAN is enabled. But now the flag for ringbuf area is VM_ALLOC, so KASAN will complain out-of-bound access after vmap() returns. Because the ringbuf area is created by mapping allocated pages, so use VM_MAP instead. After the change, info in /proc/vmallocinfo also changes from [start]-[end] 24576 ringbuf_map_alloc+0x171/0x290 vmalloc user to [start]-[end] 24576 ringbuf_map_alloc+0x171/0x290 vmap user It has a CVSS v3.1 base score of 7.1 (HIGH).

How severe is CVE-2022-48714? +

CVE-2022-48714 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-2022-48714? +

CVE-2022-48714 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-2022-48714? +

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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