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Review reviewHigh

CVE-2025-21734

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: Fix copy buffer page size For non-registered buffer, fastrpc driver copies the buffer and pass it to the remote subsystem. There is a problem with current implementation of page size calculation which is not considering the offset in the calculation. This might lead to passing of improper and out-of-bounds page size which could result in memory issue. Calculate page start and page end using the offset adjusted address instead of absolute address.

CVSS
7.8
EPSS
0.20%
10.4% percentile
CISA KEV
Not listed
Published
2025.02.27
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.20%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: Fix copy buffer page size For non-registered buffer, fastrpc driver copies the buffer and pass it to the remote subsystem. There is a problem with current implementation of page size calculation which is not considering the offset in the calculation. This might lead to passing of improper and out-of-bounds page size which could result in memory issue. Calculate page start and page end using the offset adjusted address instead of absolute address.

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 02b45b47fbe84e23699bb6bdc74d4c2780e282b4 < c56ba3ea8e3c9a69a992aad18f7a65e43e51d623, >= 02b45b47fbe84e23699bb6bdc74d4c2780e282b4 < c0464bad0e85fcd5d47e4297d1e410097c979e55, >= 02b45b47fbe84e23699bb6bdc74d4c2780e282b4 < 24a79c6bc8de763f7c50f4f84f8b0c183bc25a51, >= 02b45b47fbe84e23699bb6bdc74d4c2780e282b4 < c3f7161123fcbdc64e90119ccce292d8b66281c4, >= 02b45b47fbe84e23699bb6bdc74d4c2780e282b4 < e966eae72762ecfdbdb82627e2cda48845b9dd66, >= 5.2, >= 5.2 < 6.1.129, >= 6.2 < 6.6.78, >= 6.7 < 6.12.14, >= 6.13 < 6.13.3
Fixed versions
6.1.129, 6.6.78, 6.12.14, 6.13.3

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:H/I:H/A:H
CWE
CWE-787