CVE-2022-49551: usb: isp1760: Fix out-of-bounds array access
First published: Wed Feb 26 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: usb: isp1760: Fix out-of-bounds array access Running the driver through kasan gives an interesting splat: BUG: KASAN: global-out-of-bounds in isp1760_register+0x180/0x70c Read of size 20 at addr f1db2e64 by task swapper/0/1 (...) isp1760_register from isp1760_plat_probe+0x1d8/0x220 (...) This happens because the loop reading the regmap fields for the different ISP1760 variants look like this: for (i = 0; i < HC_FIELD_MAX; i++) { ... } Meaning it expects the arrays to be at least HC_FIELD_MAX - 1 long. However the arrays isp1760_hc_reg_fields[], isp1763_hc_reg_fields[], isp1763_hc_volatile_ranges[] and isp1763_dc_volatile_ranges[] are dynamically sized during compilation. Fix this by putting an empty assignment to the [HC_FIELD_MAX] and [DC_FIELD_MAX] array member at the end of each array. This will make the array one member longer than it needs to be, but avoids the risk of overwriting whatever is inside [HC_FIELD_MAX - 1] and is simple and intuitive to read. Also add comments explaining what is going on.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | >=5.14<5.15.46 | |
| Linux Kernel | >=5.16<5.17.14 | |
| Linux Kernel | >=5.18<5.18.3 |
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Reference Links
Frequently Asked Questions
What are the impacted versions for CVE-2022-49551?
CVE-2022-49551 affects the Linux Kernel versions between 5.14 and 5.15.46, 5.16 and 5.17.14, and 5.18 and 5.18.3.
What does CVE-2022-49551 exploit in the Linux kernel?
CVE-2022-49551 exploits an out-of-bounds array access in the isp1760 USB driver.
How can I mitigate CVE-2022-49551?
To mitigate CVE-2022-49551, update your Linux Kernel to a version that has resolved this vulnerability.
What is the nature of the vulnerability in CVE-2022-49551?
The nature of CVE-2022-49551 is an out-of-bounds memory access that can lead to potential exploitation.
How critical is the vulnerability classified in CVE-2022-49551?
CVE-2022-49551 is classified as a high severity vulnerability due to its potential impact on system stability and security.
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