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CVE-2026-31561

In the Linux kernel, the following vulnerability has been resolved: x86/cpu: Remove X86_CR4_FRED from the CR4 pinned bits mask Commit in Fixes added the FRED CR4 bit to the CR4 pinned bits mask so that whenever something else modifies CR4, that bit remains set. Which in itself is a perfectly fine idea. However, there's an issue when during boot FRED is initialized: first on the BSP and later on the APs. Thus, there's a window in time when exceptions cannot be handled. This becomes particular
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f1746c09f722dece836fd123d8bc5286d9a3b5478e9f27e195f1d6c214573623
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"unaffected","product":"Linux","programFiles":["arch/x86/kernel/cpu/common.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"d7853d9fe94abf43b46c57b0b7f8418198b7615a","status":"affected","version":"ff45746fbf005f96e42bea466698e3fdbf926013","versionType":"git"},{"lessThan":"a6e14114684d2324e5401617d6d01acb4a4e0e22","status":"affected","version":"ff45746fbf005f96e42bea466698e3fdbf926013","versionType":"git"},{"lessThan":"00d956dafa76f86a73424fe5cce3d604a8be2e4b","status":"affected","version":"ff45746fbf005f96e…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0d08668d1cc3db63ad50e532c5ad60c28185e56bb19aad4cc498b72f919aa2e9 · sha256:49e6dfaf719f52cb… · /containers/cna/affected/0

{"defaultStatus":"affected","product":"Linux","programFiles":["arch/x86/kernel/cpu/common.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.9"},{"lessThan":"6.9","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.80","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.21","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.11","versionType":"semver"},{"les…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0d08668d1cc3db63ad50e532c5ad60c28185e56bb19aad4cc498b72f919aa2e9 · sha256:49e6dfaf719f52cb… · /containers/cna/affected/1

Affected products and versions

2 source assertions
{"defaultStatus":"unaffected","product":"Linux","programFiles":["arch/x86/kernel/cpu/common.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"d7853d9fe94abf43b46c57b0b7f8418198b7615a","status":"affected","version":"ff45746fbf005f96e42bea466698e3fdbf926013","versionType":"git"},{"lessThan":"a6e14114684d2324e5401617d6d01acb4a4e0e22","status":"affected","version":"ff45746fbf005f96e42bea466698e3fdbf926013","versionType":"git"},{"lessThan":"00d956dafa76f86a73424fe5cce3d604a8be2e4b","status":"affected","version":"ff45746fbf005f96e…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0d08668d1cc3db63ad50e532c5ad60c28185e56bb19aad4cc498b72f919aa2e9 · sha256:49e6dfaf719f52cb… · /containers/cna/affected/0
{"defaultStatus":"affected","product":"Linux","programFiles":["arch/x86/kernel/cpu/common.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.9"},{"lessThan":"6.9","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.80","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.21","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.11","versionType":"semver"},{"les…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0d08668d1cc3db63ad50e532c5ad60c28185e56bb19aad4cc498b72f919aa2e9 · sha256:49e6dfaf719f52cb… · /containers/cna/affected/1

Source references

4 source assertions
{"url":"https://git.kernel.org/stable/c/00d956dafa76f86a73424fe5cce3d604a8be2e4b"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0d08668d1cc3db63ad50e532c5ad60c28185e56bb19aad4cc498b72f919aa2e9 · sha256:49e6dfaf719f52cb… · /containers/cna/references/2
{"url":"https://git.kernel.org/stable/c/411df123c017169922cc767affce76282b8e6c85"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0d08668d1cc3db63ad50e532c5ad60c28185e56bb19aad4cc498b72f919aa2e9 · sha256:49e6dfaf719f52cb… · /containers/cna/references/3
{"url":"https://git.kernel.org/stable/c/a6e14114684d2324e5401617d6d01acb4a4e0e22"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0d08668d1cc3db63ad50e532c5ad60c28185e56bb19aad4cc498b72f919aa2e9 · sha256:49e6dfaf719f52cb… · /containers/cna/references/1
{"url":"https://git.kernel.org/stable/c/d7853d9fe94abf43b46c57b0b7f8418198b7615a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0d08668d1cc3db63ad50e532c5ad60c28185e56bb19aad4cc498b72f919aa2e9 · sha256:49e6dfaf719f52cb… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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