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Review reviewHigh

CVE-2024-40974

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: powerpc/pseries: Enforce hcall result buffer validity and size plpar_hcall(), plpar_hcall9(), and related functions expect callers to provide valid result buffers of certain minimum size. Currently this is communicated only through comments in the code and the compiler has no idea. For example, if I write a bug like this: long retbuf[PLPAR_HCALL_BUFSIZE]; // should be PLPAR_HCALL9_BUFSIZE plpar_hcall9(H_ALLOCATE_VAS_WINDOW, retbuf, ...); This compiles with no diagnostics emitted, but likely results in stack corruption at ru...

CVSS
7.8
EPSS
0.30%
22.5% percentile
CISA KEV
Not listed
Published
2024.07.12
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.30%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: powerpc/pseries: Enforce hcall result buffer validity and size plpar_hcall(), plpar_hcall9(), and related functions expect callers to provide valid result buffers of certain minimum size. Currently this is communicated only through comments in the code and the compiler has no idea. For example, if I write a bug like this: long retbuf[PLPAR_HCALL_BUFSIZE]; // should be PLPAR_HCALL9_BUFSIZE plpar_hcall9(H_ALLOCATE_VAS_WINDOW, retbuf, ...); This compiles with no diagnostics emitted, but likely results in stack corruption at ru...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= b9377ffc3a03cde558d76349a262a1adbb6d3112 < acf2b80c31c37acab040baa3cf5f19fbd5140b18, >= b9377ffc3a03cde558d76349a262a1adbb6d3112 < 19c166ee42cf16d8b156a6cb4544122d9a65d3ca, >= b9377ffc3a03cde558d76349a262a1adbb6d3112 < a8c988d752b3d98d5cc1e3929c519a55ef55426c, >= b9377ffc3a03cde558d76349a262a1adbb6d3112 < 262e942ff5a839b9e4f3302a8987928b0c8b8a2d, >= b9377ffc3a03cde558d76349a262a1adbb6d3112 < 8aa11aa001576bf3b00dcb8559564ad7a3113588, >= b9377ffc3a03cde558d76349a262a1adbb6d3112 < 3ad0034910a57aa88ed9976b1431b7b8c84e0048, >= b9377ffc3a03cde558d76349a262a1adbb6d3112 < aa6107dcc4ce9a3451f2d729204713783b657257, >= b9377ffc3a03cde558d76349a262a1adbb6d3112 < ff2e185cf73df480ec69675936c4ee75a445c3e4, >= 2.6.19, < 4.19.317, >= 4.20 < 5.4.279, >= 5.5 < 5.10.221, >= 5.11 < 5.15.162, >= 5.16 < 6.1.96, >= 6.2 < 6.6.36, >= 6.7 < 6.9.7
Fixed versions
4.19.317, 5.4.279, 5.10.221, 5.15.162, 6.1.96, 6.6.36, 6.9.7

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
CVE-2024-40974 — Linux Linux, linux kernel | SECUFOCUS NOW