# CVE-2022-49172: linux: In the Linux kernel, the following vulnerability has been resolved:  parisc: Fix non-access data TLB cache flush faul...

CVE-2022-49172 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49172, released February 26, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-49172
- Priority: High
- CVSS: 7.1 (high)
- EPSS: 0.0027
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 26, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  parisc: Fix non-access data TLB cache flush faults  When a page is not present, we get non-access data TLB faults from the fdc and fic instructions in flush_user_dcache_range_asm and flush_user_icache_range_asm. When these occur, the cache line is not invalidated and potentially we get memory corruption. The problem was hidden by the nullification of the flush instructions.  These faults also affect performance. With pa8800/pa8900 processors, there will be 32 faults per 4 KB page since the cache line is 128 bytes.  There will be more faults with earlier processors.  The problem is fixed by using flush_cache_pages(). It does the flush using a tmp alias mapping.  The flush_cache_pages() call in flush_cache_range() flushed too large a range.  V2: Remove unnecessary preempt_disable() and preempt_enable() calls.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.17.3-1 | [DEBIAN-CVE-2022-49172](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49172.md) | Feb 26, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.17.3-1 | [DEBIAN-CVE-2022-49172](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49172.md) | Feb 26, 2025 |
| Linux | linux Debian 14 | 5.17.3-1 | [DEBIAN-CVE-2022-49172](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49172.md) | Feb 26, 2025 |

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