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Review reviewHigh

CVE-2022-49172

Linux Linux, linux kernel

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...

CVSS
7.1
EPSS
0.27%
18.8% percentile
CISA KEV
Not listed
Published
2025.02.26
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.27%
Technical severityCVSS 7.1

Vulnerability overview

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...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b3d6adb3a49d82e4e557c5fc16f50c9ff731da5d, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < ddca4b82027e2a66333dd40fab21a4beff435c7e, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f839e5f1cef36ce268950c387129b1bfefdaebc9, >= 2.6.12, < 5.16.19, >= 5.17 < 5.17.2
Fixed versions
5.16.19, 5.17.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
CWE
Not available