cpu: Re-enable CPU mitigations by default for !X86 architectures

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Summary

CVECVE-2024-35996
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-05-20 10:15:13 UTC
Updated2026-05-12 12:16:46 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: cpu: Re-enable CPU mitigations by default for !X86 architectures Rename x86's to CPU_MITIGATIONS, define it in generic code, and force it on for all architectures exception x86. A recent commit to turn mitigations off by default if SPECULATION_MITIGATIONS=n kinda sorta missed that "cpu_mitigations" is completely generic, whereas SPECULATION_MITIGATIONS is x86-specific. Rename x86's SPECULATIVE_MITIGATIONS instead of keeping both and have it select CPU_MITIGATIONS, as having two configs for the same thing is unnecessary and confusing. This will also allow x86 to use the knob to manage mitigations that aren't strictly related to speculative execution. Use another Kconfig to communicate to common code that CPU_MITIGATIONS is already defined instead of having x86's menu depend on the common CPU_MITIGATIONS. This allows keeping a single point of contact for all of x86's mitigations, and it's not clear that other architectures *want* to allow disabling mitigations at compile-time.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 30da4180fd768973189dc364648f9c436e57b01d af6d6a923b40bf6471e44067ac61cc5814b48e7f git Not specified
CNA Linux Linux affected 70688450dddaf91e12fd4fc625da3297025932c9 36b32816fbab267611f073223f1b0b816ec5920f git Not specified
CNA Linux Linux affected 9c09773917fbb77dff85b433e1e89123fc5fb530 38f17d1fbb5bfb56ca1419e2d06376d57a9396f9 git Not specified
CNA Linux Linux affected 2978ee7c973ce81b6e51100ba1e5ae001af624b9 8292f4f8dd1b005d0688d726261004f816ef730a git Not specified
CNA Linux Linux affected c4a9babdd5d5a41a74269a2e1aa1647b1b4c45bb fd8547ebc187037cc69441a15c1441aeaab80f49 git Not specified
CNA Linux Linux affected f337a6a21e2fd67eadea471e93d05dd37baaa9be fe42754b94a42d08cf9501790afc25c4f6a5f631 git Not specified
CNA Linux Linux affected 5.15.156 5.15.158 semver Not specified
CNA Linux Linux affected 6.1.87 6.1.90 semver Not specified
CNA Linux Linux affected 6.6.28 6.6.30 semver Not specified
CNA Linux Linux affected 6.8.7 6.8.9 semver Not specified
ADP Siemens RUGGEDCOM RST2428P affected V3.1 custom Not specified
ADP Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 Family unaffected * custom Not specified
ADP Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 Family affected V3.1 custom Not specified
ADP Siemens SIMATIC S7-1500 TM MFP - GNU/Linux Subsystem affected * custom Not specified

References

ReferenceSourceLinkTags
lists.debian.org/debian-lts-announce/2024/06/msg00017.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/fd8547ebc187037cc69441a15c1441aeaab80f49 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-265688.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/fe42754b94a42d08cf9501790afc25c4f6a5f631 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/36b32816fbab267611f073223f1b0b816ec5920f af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-613116.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/38f17d1fbb5bfb56ca1419e2d06376d57a9396f9 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/8292f4f8dd1b005d0688d726261004f816ef730a af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/af6d6a923b40bf6471e44067ac61cc5814b48e7f af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
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