# CVE-2023-52488: linux: In the Linux kernel, the following vulnerability has been resolved:  serial: sc16is7xx: convert from _raw_ to _noinc_...

CVE-2023-52488 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-52488, released March 11, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-52488
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0029
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 11, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  serial: sc16is7xx: convert from _raw_ to _noinc_ regmap functions for FIFO  The SC16IS7XX IC supports a burst mode to access the FIFOs where the initial register address is sent ($00), followed by all the FIFO data without having to resend the register address each time. In this mode, the IC doesn't increment the register address for each R/W byte.  The regmap_raw_read() and regmap_raw_write() are functions which can perform IO over multiple registers. They are currently used to read/write from/to the FIFO, and although they operate correctly in this burst mode on the SPI bus, they would corrupt the regmap cache if it was not disabled manually. The reason is that when the R/W size is more than 1 byte, these functions assume that the register address is incremented and handle the cache accordingly.  Convert FIFO R/W functions to use the regmap _noinc_ versions in order to remove the manual cache control which was a workaround when using the _raw_ versions. FIFO registers are properly declared as volatile so cache will not be used/updated for FIFO accesses.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.76-1 | [DEBIAN-CVE-2023-52488](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52488.md) | Mar 11, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.6.15-1 | [DEBIAN-CVE-2023-52488](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52488.md) | Mar 11, 2024 |
| Linux | linux Debian 14 | 6.6.15-1 | [DEBIAN-CVE-2023-52488](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52488.md) | Mar 11, 2024 |

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