CVE-2022-48987: linux kernel Integer Overflow — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: media: v4l2-dv-timings.c: fix too strict blanking sanity checks Sanity checks were added to verify the v4l2_bt_timings blanking fields in order to avoid integer overflows when userspace passes weird values. But that assumed that userspace would correctly fill in the front porch, backporch and sync values, but sometimes all you know is the total blanking, which is then assigned to just one of these fields. And that can fail with these checks. So instead set a maximum for the total horizontal and vertical blanking and check that each field remains below that. That is still sufficient to avoid integer overflows, but it also allows for more flexibility in how userspace fills in these fields.

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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-190 Integer Overflow

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.9.332 — 4.9.336
linux	linux_kernel	4.14.298 — 4.14.302
linux	linux_kernel	4.19.264 — 4.19.269
linux	linux_kernel	5.4.226 — 5.4.227
linux	linux_kernel	5.10.153 — 5.10.159
linux	linux_kernel	5.15.77 — 5.15.83
linux	linux_kernel	6.0.7 — 6.0.13

References

Advisories & Patches

https://git.kernel.org/stable/c/0d73b49c4037199472b29574ae21c21aef493971 https://git.kernel.org/stable/c/2572ab14b73aa45b6ae7e4c089ccf119fed5cf89 https://git.kernel.org/stable/c/32f01f0306a98629508f84d7ef0d1d037bc274a2 https://git.kernel.org/stable/c/4afc77068e36cee45b39d4fdc7513de26980f72c https://git.kernel.org/stable/c/5eef2141776da02772c44ec406d6871a790761ee https://git.kernel.org/stable/c/6fb8bc29bfa80707994a63cc97e2f9920e0b0608 https://git.kernel.org/stable/c/a2b56627c0d13009e02f6f2c0206c0451ed19a0e https://git.kernel.org/stable/c/d3d14cdf1c7ae2caa3e999bae95ba99e955fb7c3

Frequently Asked Questions

What is CVE-2022-48987? +

In the Linux kernel, the following vulnerability has been resolved: media: v4l2-dv-timings.c: fix too strict blanking sanity checks Sanity checks were added to verify the v4l2_bt_timings blanking fields in order to avoid integer overflows when userspace passes weird values. But that assumed that userspace would correctly fill in the front porch, backporch and sync values, but sometimes all you know is the total blanking, which is then assigned to just one of these fields. And that can fail with these checks. So instead set a maximum for the total horizontal and vertical blanking and check that each field remains below that. That is still sufficient to avoid integer overflows, but it also allows for more flexibility in how userspace fills in these fields. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-48987? +

CVE-2022-48987 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-2022-48987? +

CVE-2022-48987 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-2022-48987? +

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-2022-48987