CVE-2024-35996

Summary

In 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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux30da4180fd768973189dc364648f9c436e57b01d < af6d6a923b40bf6471e44067ac61cc5814b48e7faffected
LinuxLinux70688450dddaf91e12fd4fc625da3297025932c9 < 36b32816fbab267611f073223f1b0b816ec5920faffected
LinuxLinux9c09773917fbb77dff85b433e1e89123fc5fb530 < 38f17d1fbb5bfb56ca1419e2d06376d57a9396f9affected
LinuxLinux2978ee7c973ce81b6e51100ba1e5ae001af624b9 < 8292f4f8dd1b005d0688d726261004f816ef730aaffected
LinuxLinuxc4a9babdd5d5a41a74269a2e1aa1647b1b4c45bb < fd8547ebc187037cc69441a15c1441aeaab80f49affected
LinuxLinuxf337a6a21e2fd67eadea471e93d05dd37baaa9be < fe42754b94a42d08cf9501790afc25c4f6a5f631affected
LinuxLinux5.15.156 < 5.15.158affected
LinuxLinux6.1.87 < 6.1.90affected
LinuxLinux6.6.28 < 6.6.30affected
LinuxLinux6.8.7 < 6.8.9affected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

Additional References

References